CN116344083A - Method and system for diagnosing fault of miniature fission ionization chamber - Google Patents

Method and system for diagnosing fault of miniature fission ionization chamber Download PDF

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Publication number
CN116344083A
CN116344083A CN202211581896.8A CN202211581896A CN116344083A CN 116344083 A CN116344083 A CN 116344083A CN 202211581896 A CN202211581896 A CN 202211581896A CN 116344083 A CN116344083 A CN 116344083A
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ionization chamber
diagnosed
fission ionization
micro
fission
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郑军伟
刘航
汪宇
张国军
程雄伟
张恒凯
柳继坤
杨文清
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
CGN Power Co Ltd
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
CGN Power Co Ltd
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C17/00—Monitoring; Testing ; Maintaining
    • G21C17/06—Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G01T1/185—Measuring radiation intensity with ionisation chamber arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T7/00—Details of radiation-measuring instruments
    • G01T7/005—Details of radiation-measuring instruments calibration techniques
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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Abstract

The invention relates to a fault diagnosis method and a fault diagnosis system for a miniature fission ionization chamber, comprising the following steps: monitoring miniature fission ionization chambers in the same pressurized water reactor nuclear motor unit, and acquiring fault types of the miniature fission ionization chambers to be diagnosed when any miniature fission ionization chamber has abnormal correction coefficients or plateau inclination; if the fault type is that the calibration coefficient exceeds the standard, diagnosing the miniature fission ionization chamber to be diagnosed by adopting a preset calibration coefficient diagnosis method; and if the fault type is that the plateau slope abnormality is larger or exceeds the standard, diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset plateau slope diagnosis method. The diagnosis is carried out based on the physical meaning of the calibration coefficient by adopting the preset calibration coefficient diagnosis method, the diagnosis basis is more sufficient, and meanwhile, the diagnosis is carried out by adopting the preset plateau slope diagnosis method, so that the problem of insufficient basis for judging by only the deviation or exceeding of plateau slope abnormality is solved.

Description

Method and system for diagnosing fault of miniature fission ionization chamber
Technical Field
The invention relates to the technical field of nuclear reactors, in particular to a fault diagnosis method and system for a miniature fission ionization chamber.
Background
The operating specifications of the 1000MW class modified pressurized water reactor nuclear power plant specify that the Neutron Measurement System (NMS) of the core measurement system must be available at nuclear powers greater than 50% FP (FP is rated). For a nuclear power unit, a device or system is considered to be usable if it can be proven to be capable of performing the particular functions that the design imparts while having the required level of performance, otherwise it should be considered to be unusable.
NMS measures core neutron fluence rate using 5 CFUF-43P mini fission ionization chambers (MFCs), which operate in current mode, within a sensitive volume 235 The U undergoes fission upon neutron irradiation, and the fission fragments deposit energy in the sensitive volume by ionizing the working gas. In conventional MFC fault diagnosis work, the main basis for diagnosing whether an MFC is available is the MFC saturation characteristicNot more than 0.2% V -1 And the calibration coefficient of the MFC should be between [0.92,1.08 ]]。
In the debugging and starting stage, the problem that the calibration coefficient of a new MFC exceeds the acceptance standard range occurs in a plurality of pressurized water reactor nuclear power units, and the MFC with the calibration coefficient exceeding the standard is usually replaced. The calibration coefficient of the MFC is automatically calculated by the NMS, the physical meaning of the calibration coefficient is not clear in the traditional fault diagnosis method, the calibration coefficient is used as the basis of the fault diagnosis of the MFC and is derived from the operation and maintenance experience of the foreign pressurized water reactor nuclear motor unit, and the calibration coefficient is used as a single technical index for judging whether the MFC is available or not and lacks necessary demonstration for a long time. The MFC is used as a mature nuclear radiation detector, the manufacturing process and the performance level of the MFC reach the industrial application level, after the MFC is manufactured, the MFC needs to enter a nuclear reactor for testing for inspection and calibration, the MFC can be shipped from a factory after being qualified by verification, and the probability of equipment unavailability caused by the failure of a new MFC at the initial stage of operation is low. Therefore, it is necessary to study a method for using the calibration coefficients of the MFC for MFC fault diagnosis, and a new fault diagnosis method is formulated based on the study results.
Empirical data for MFC operation indicate that the ideal plateau slope should be between [0.02,0.10 ]]％·V -1 Typically, 1 MFC can perform about 3000 core neutron measurement tasks. When the plateau slope exceeds 0.10% V -1 At this time, it is often necessary to check the operating state of the MFC. A portion of the units developed a plateau of more than 0.2% V for individual MFCs after the first power up to 50% fp -1 The problem is that maintenance departments replace MFCs with plateau inclined exceeding standards; there were also individual units biased by MFC plateau bias abnormality (about 0.15%. V) -1 ) Although the plateau slope does not exceed 0.2%. V -1 However, maintenance departments, after taking conservative maintenance strategies, still replace this portion of the MFC with a larger plateau inclination. Despite the replacement of MFCs with a large or superscalar plateau abnormality during the commissioning phase, there is still a lack of systematic research on whether it is appropriate to use plateau as a single technical indicator for diagnosing the availability of MFCs.
The MFC is expensive to import and becomes a highly radioactive article after being activated, for example, it is unnecessarily replaced due to fault diagnosis errors, and it causes not only unplanned shutdown and spare part consumption but also unnecessary radioactive irradiation for personnel performing replacement operations. Therefore, in order to more accurately perform the failure diagnosis of the MFC, it is necessary to study the MFC failure diagnosis method.
In existing solutions, this is done by staff-operated control systems by performing a calibration factor, plateau tilt check on the MFCs prior to profiling the reactor core power profile. The NMS automatically outputs the calibration coefficient and the plateau slope of the MFC after the checking work is finished, and staff compares the calibration coefficient and the plateau slope obtained by checking with corresponding acceptance criteria respectively. When the calibration coefficient exceeds the standard or the plateau slope exceeds the standard, the fault diagnosis result of the MFC is unavailable.
However, the schemes currently used have the following problems:
1) The physical meaning of the MFC calibration coefficient is not clear, so that the basis for judging the unavailability of the MFC is insufficient only by exceeding the calibration coefficient;
2) The reasons for the large plateau tilt abnormality or exceeding the standard of the factory-delivered MFC at the initial stage of operation after the qualified detection of the manufacturing factory are unknown, and the reasons for the large plateau tilt abnormality or exceeding the standard of the new MFC at the initial stage of operation and whether the plateau tilt can be restored to a comparatively ideal level through certain treatment measures are required to be further researched, so that the unavailable basis of the new MFC is judged only by the large plateau tilt abnormality or exceeding the standard;
3) The method for diagnosing faults of the MFC according to the plateau slope and the calibration coefficients is too simple, and the prior fault diagnosis technology does not fully envelop the electrical characteristics and the nuclear characteristics of the MFC, so that the risk of misdiagnosis exists;
4) The working logic of the existing MFC fault diagnosis technology is unclear, the technical basis for fault diagnosis is too little, and an effective fault diagnosis method is lacking when a worker performs MFC fault diagnosis, so that effective diagnosis of the MFC suspected to have faults is not facilitated systematically.
Disclosure of Invention
The invention aims to solve the technical problem of providing a miniature fission ionization chamber fault diagnosis method and system aiming at the defects of the prior art.
The technical scheme adopted for solving the technical problems is as follows: a fault diagnosis method for a miniature fission ionization chamber is constructed, which comprises the following steps:
monitoring each micro fission ionization chamber in the same pressurized water reactor nuclear motor unit, and judging whether the micro fission ionization chambers have abnormal correction coefficients or plateau inclination;
if any one of the micro fission ionization chambers in the same pressurized water reactor nuclear power unit is abnormal in calibration coefficient or plateau slope, the fault type of the micro fission ionization chamber to be diagnosed is obtained; the miniature fission ionization chamber to be diagnosed is a miniature fission ionization chamber with abnormal correction coefficient or plateau slope;
if the fault type of the micro fission ionization chamber to be diagnosed is that the calibration coefficient exceeds the standard, diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset calibration coefficient diagnosis method;
And if the fault type of the micro fission ionization chamber to be diagnosed is that the plateau slope is abnormal and is larger or exceeds the standard, diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset plateau slope diagnosis method.
In the method for diagnosing the fault of the micro-fission ionization chamber, if the fault type of the micro-fission ionization chamber to be diagnosed is that the calibration coefficient exceeds the standard, the method for diagnosing the micro-fission ionization chamber to be diagnosed by adopting the preset calibration coefficient comprises the following steps:
determining the physical meaning of the calibration coefficient of the miniature fission ionization chamber; the physical significance of the calibration coefficients of the miniature fission ionization chamber is as follows: normalized value of thermal neutron sensitivity of any micro fission ionization chamber in the same unit relative to reference thermal neutron sensitivity;
determining acceptance criteria for the calibration coefficients of the mini-fission ionization chambers to exceed the standard based on the physical significance of the calibration coefficients of the mini-fission ionization chambers;
and diagnosing the miniature fission ionization chamber to be diagnosed according to the acceptance standard with the standard exceeding the calibration coefficient.
In the fault diagnosis method for the micro-fission ionization chamber, the physical significance of determining the calibration coefficient of the micro-fission ionization chamber comprises the following steps:
Determining a reference calibration mode of the miniature fission ionization chamber;
according to the determined reference calibration mode, controlling all micro fission ionization chambers in the same pressurized water reactor nuclear power unit to enter the same measurement path for calibration;
after the calibration is completed, obtaining the average current of each micro fission ionization chamber;
comparing the average current of each micro fission ionization chamber with the reference current to obtain a calibration coefficient of each micro fission ionization chamber;
acquiring the thermal neutron sensitivity of each micro fission ionization chamber;
determining the relationship between the average current and the thermal neutron sensitivity and the thermal neutron fluence average value on the reactor core measuring path based on the average current of each micro-fission ionization chamber and the thermal neutron sensitivity of each micro-fission ionization chamber;
and determining the physical significance of the calibration coefficients of the micro fission ionization chambers according to the relationship between the calibration coefficients of each micro fission ionization chamber and the average current and the average thermal neutron sensitivity and the average thermal neutron fluence rate on the reactor core measuring path.
In the fault diagnosis method for the miniature fission ionization chamber, the relation between the average current and the thermal neutron sensitivity and the thermal neutron fluence average value on the reactor core measuring path is as follows:
The average current of each mini-fission ionization chamber is equal to the product of the thermal neutron sensitivity and the average of the thermal neutron fluence rates on the core measurement path.
In the fault diagnosis method for the miniature fission ionization chamber, the acceptance criterion for the calibration coefficient of the miniature fission ionization chamber exceeding the standard is as follows:
if the calibration coefficient of the micro fission ionization chamber is in the reference coefficient range, judging that the calibration coefficient of the micro fission ionization chamber is not out of standard;
and if the calibration coefficient of the miniature fission ionization chamber exceeds the reference coefficient range, judging that the calibration coefficient of the miniature fission ionization chamber exceeds the standard.
In the method for diagnosing the fault of the micro-fission ionization chamber, the diagnosing the micro-fission ionization chamber to be diagnosed according to the acceptance criterion with the standard exceeding the calibration coefficient comprises the following steps:
acquiring factory thermal neutron sensitivity of a faulty mini-fission ionization chamber;
acquiring a reference thermal neutron sensitivity;
calculating a calibration coefficient of the micro fission ionization chamber to be diagnosed according to the factory thermal neutron sensitivity and the reference thermal neutron sensitivity of the micro fission ionization chamber to be diagnosed;
comparing the calibration coefficient of the mini-fission ionization chamber to be diagnosed with the reference coefficient;
And diagnosing the micro fission ionization chamber to be diagnosed according to the comparison result.
In the method for diagnosing the fault of the micro-fission ionization chamber, the diagnosing the micro-fission ionization chamber to be diagnosed according to the comparison result comprises the following steps:
if the comparison result is: and if the calibration coefficient of the micro fission ionization chamber to be diagnosed exceeds the reference coefficient range, then:
acquiring an automatic calibration coefficient of the miniature fission ionization chamber to be diagnosed; the automatic calibration coefficient is a calibration coefficient calculated by a neutron measurement system;
if the calibration coefficient of the micro fission ionization chamber to be diagnosed is the same as the automatic calibration coefficient, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the overproof of the calibration coefficient is that the relative deviation of the thermal neutron sensitivity of the factory is too large, and the miniature fission ionization chamber to be diagnosed is available.
In the method for diagnosing the fault of the micro-fission ionization chamber, the diagnosing the micro-fission ionization chamber to be diagnosed according to the comparison result comprises the following steps:
if the comparison result is: the calibration coefficients of the micro fission ionization chamber to be diagnosed are within the reference coefficient range, then:
Comparing the calibration coefficients of the micro fission ionization chamber to be diagnosed with the upper limit value and the lower limit value of the reference coefficient range respectively;
if the difference value between the calibration coefficient of the micro-fission ionization chamber to be diagnosed and the upper limit value is within a preset range or the difference value between the calibration coefficient of the micro-fission ionization chamber to be diagnosed and the lower limit value is within a preset range, the diagnosis result of the micro-fission ionization chamber to be diagnosed is as follows: the reason for the overproof of the calibration coefficient is that the thermal neutron sensitivity variation is different between the micro fission ionization chamber to be diagnosed and the reference micro fission ionization chamber in the running process of the unit.
In the method for diagnosing the fault of the micro-fission ionization chamber, the diagnosing the micro-fission ionization chamber to be diagnosed according to the comparison result comprises the following steps:
if the comparison result is: the calibration coefficients of the micro fission ionization chamber to be diagnosed are within the reference coefficient range, then:
comparing the calibration coefficient of the miniature fission ionization chamber to be diagnosed with a preset value;
if the difference value between the calibration coefficient of the micro fission ionization chamber to be diagnosed and the preset value is in the deviation range, the diagnosis result of the micro fission ionization chamber to be diagnosed is as follows: the reason for the overproof of the calibration coefficient is that the difference of the thermal neutron sensitivity variation of the micro-fission ionization chamber to be diagnosed and the reference micro-fission ionization chamber is larger than a threshold value in the running process of the micro-fission ionization chamber in the unit.
In the method for diagnosing the fault of the micro-fission ionization chamber according to the invention, the diagnosing the micro-fission ionization chamber to be diagnosed according to the comparison result further comprises:
if the difference of thermal neutron sensitivity variation of the micro fission ionization chamber to be diagnosed in the running process of the unit is larger than a threshold value, then:
comparing the automatic calibration coefficient of the micro fission ionization chamber to be diagnosed with the upper limit value of the reference coefficient range;
if the automatic calibration coefficient is greater than the upper limit value, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the exceeding of the calibration coefficient is that the thermal neutron sensitivity of the reference mini-fission ionization chamber is abnormally reduced, and the reference mini-fission ionization chamber is not available.
In the method for diagnosing the fault of the micro-fission ionization chamber according to the invention, the diagnosing the micro-fission ionization chamber to be diagnosed according to the comparison result further comprises:
if the difference of thermal neutron sensitivity variation of the micro fission ionization chamber to be diagnosed in the running process of the unit is larger than a threshold value, then:
comparing the automatic calibration coefficient of the micro fission ionization chamber to be diagnosed with the lower limit value of the reference coefficient range;
If the automatic calibration coefficient is smaller than the lower limit value, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the exceeding of the calibration coefficient is that the thermal neutron sensitivity of the micro-fission ionization chamber to be diagnosed is abnormally reduced, and the micro-fission ionization chamber to be diagnosed is not available.
In the method for diagnosing the fault of the micro-fission ionization chamber, if the fault type of the micro-fission ionization chamber to be diagnosed is that the plateau slope abnormality is large or exceeds the standard, the method for diagnosing the micro-fission ionization chamber to be diagnosed by adopting a preset plateau slope diagnosis method comprises the following steps:
acquiring electrical parameters of the micro fission ionization chamber to be diagnosed;
judging whether the electrical characteristics of the micro fission ionization chamber to be diagnosed are qualified or not according to the electrical parameters;
if not, diagnosing the micro fission ionization chamber to be diagnosed based on the electrical characteristics;
if yes, acquiring nuclear characteristic parameters of the micro fission ionization chamber to be diagnosed;
and diagnosing the micro fission ionization chamber to be diagnosed according to the nuclear characteristic parameter.
In the micro-fission ionization chamber fault diagnosis method according to the present invention, the electrical parameters include: a failed mini-fission ionization chamber and an insulation resistance of a measurement loop thereof;
The judging whether the electrical characteristics of the micro fission ionization chamber to be diagnosed are qualified according to the electrical parameters comprises the following steps:
comparing the insulation resistance of the micro fission ionization chamber to be diagnosed and the measurement loop thereof with a reference resistance value;
if the insulation resistance of the micro fission ionization chamber to be diagnosed and the measurement loop thereof is smaller than the reference resistance, judging that the electrical characteristics of the micro fission ionization chamber to be diagnosed are unqualified;
the diagnosing the mini-fission ionization chamber to be diagnosed based on the electrical characteristic includes:
if the insulation resistance of the micro fission ionization chamber to be diagnosed and the measurement loop thereof is smaller than the reference resistance, the diagnosis result of the micro fission ionization chamber to be diagnosed is that: plateau bias is large or exceeds standard because insulation resistance of the micro-fission ionization chamber to be diagnosed and a measuring loop thereof is abnormal, and the micro-fission ionization chamber to be diagnosed is not available.
In the micro-fission ionization chamber fault diagnosis method according to the present invention, the electrical parameters include: a failed mini-fission ionization chamber and its leakage current of its measurement loop;
the judging whether the electrical characteristics of the micro fission ionization chamber to be diagnosed are qualified according to the electrical parameters comprises the following steps:
Comparing the leakage current of the micro fission ionization chamber to be diagnosed and the measuring loop thereof with a reference current;
if the leakage current of the micro fission ionization chamber to be diagnosed and the measuring loop thereof is larger than the reference current, judging that the electrical characteristics of the micro fission ionization chamber to be diagnosed are unqualified;
the diagnosing the mini-fission ionization chamber to be diagnosed based on the electrical characteristic includes:
if the leakage current of the micro fission ionization chamber to be diagnosed and the measuring loop thereof is larger than the reference current, the diagnosis result of the micro fission ionization chamber to be diagnosed is that: plateau bias is large or exceeds standard because of abnormal leakage current of the micro-fission ionization chamber to be diagnosed and a measuring loop thereof, and the micro-fission ionization chamber to be diagnosed is not available.
In the micro-fission ionization chamber fault diagnosis method according to the present invention, the electrical parameters include: a failed mini-fission ionization chamber and a capacitance of a measurement loop thereof;
the judging whether the electrical characteristics of the micro fission ionization chamber to be diagnosed are qualified according to the electrical parameters comprises the following steps:
judging whether the capacitance of the micro fission ionization chamber to be diagnosed and the measuring loop thereof is in a reference capacitance range or not;
If the capacitance of the micro fission ionization chamber to be diagnosed and the measuring loop thereof are not in the reference capacitance range, judging that the electrical characteristics of the micro fission ionization chamber to be diagnosed are unqualified;
the diagnosing the mini-fission ionization chamber to be diagnosed based on the electrical characteristic includes:
if the capacitance of the micro fission ionization chamber to be diagnosed and the measurement loop thereof is not in the reference capacitance range, the diagnosis result of the micro fission ionization chamber to be diagnosed is: plateau bias is large or exceeds standard because the gap between the high voltage electrode and the collector of the mini-fission ionization chamber to be diagnosed is abnormal, and the mini-fission ionization chamber to be diagnosed is not available.
In the method for diagnosing the fault of the micro-fission ionization chamber, the nuclear characteristic parameters of the micro-fission ionization chamber to be diagnosed comprise: measuring current and plateau slope;
the diagnosing the mini-fission ionization chamber to be diagnosed according to the nuclear characteristic parameter includes:
acquiring the measured current of the micro fission ionization chamber to be diagnosed;
judging whether the measured current of the micro fission ionization chamber to be diagnosed has a step value or a peak value;
If yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the large plateau tilt or exceeding the standard is that the measured current is abnormal, and the miniature fission ionization chamber to be diagnosed is not available;
and if not, diagnosing the micro fission ionization chamber to be diagnosed according to the plateau slope.
In the micro-fission ionization chamber fault diagnosis method of the present invention, the diagnosing the micro-fission ionization chamber to be diagnosed according to the plateau includes:
controlling the miniature fission ionization chamber to be diagnosed to execute a preprocessing task;
after finishing the pretreatment task, obtaining the plateau angle of the micro fission ionization chamber to be diagnosed after pretreatment;
diagnosing the mini-fission ionization chamber to be diagnosed based on the pretreated plateau slope.
In the mini-fission ionization chamber fault diagnosis method of the present invention, the diagnosing the mini-fission ionization chamber to be diagnosed based on the preprocessed plateau includes:
judging whether the preprocessed plateau slope is in a first plateau slope range or not;
if yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the large plateau inclination or exceeding the standard is that the nuclear characteristics of the failed micro-fission ionization chamber are abnormal due to the fact that trace impurity gas enters the sensitive body, and when the plateau inclination of the micro-fission ionization chamber to be diagnosed is restored to a normal range, the micro-fission ionization chamber to be diagnosed is restored to a usable state.
In the mini-fission ionization chamber fault diagnosis method of the present invention, the diagnosing the mini-fission ionization chamber to be diagnosed based on the preprocessed plateau includes:
judging whether the preprocessed plateau slope is in a second plateau slope range or not;
if yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the failed mini-fission ionization chamber is failed and available and the mini-fission ionization chamber to be diagnosed is replaced for a preset maintenance period.
In the mini-fission ionization chamber fault diagnosis method of the present invention, the diagnosing the mini-fission ionization chamber to be diagnosed based on the preprocessed plateau includes:
judging whether the preprocessed plateau slope is larger than an upper limit value of the plateau slope or not;
if yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the plateau bias or superscalar is that the mini-fission ionization chamber to be diagnosed is not available.
The invention also provides a micro fission ionization chamber fault diagnosis system, which comprises:
the monitoring unit is used for monitoring each micro fission ionization chamber in the same pressurized water reactor nuclear motor unit and judging whether the micro fission ionization chambers generate correction coefficients or plateau slope abnormality or not;
The acquisition unit is used for acquiring the fault type of the micro fission ionization chamber to be diagnosed when the correction coefficient or the plateau inclination abnormality occurs in any micro fission ionization chamber in the same pressurized water reactor nuclear power unit; the miniature fission ionization chamber to be diagnosed is a miniature fission ionization chamber with abnormal correction coefficient or plateau slope;
the first diagnosis unit is used for diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset calibration coefficient diagnosis method when the fault type of the micro fission ionization chamber to be diagnosed is that the calibration coefficient exceeds the standard;
and the second diagnosis unit is used for diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset plateau slope diagnosis method when the fault type of the micro fission ionization chamber to be diagnosed is that the plateau slope is abnormal and is large or exceeds the standard.
The micro fission ionization chamber fault diagnosis method and system have the following beneficial effects: comprising the following steps: monitoring miniature fission ionization chambers in the same pressurized water reactor nuclear motor unit, and acquiring fault types of the miniature fission ionization chambers to be diagnosed when any miniature fission ionization chamber has abnormal correction coefficients or plateau inclination; if the fault type is that the calibration coefficient exceeds the standard, diagnosing the miniature fission ionization chamber to be diagnosed by adopting a preset calibration coefficient diagnosis method; and if the fault type is that the plateau slope abnormality is larger or exceeds the standard, diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset plateau slope diagnosis method. The diagnosis is carried out based on the physical meaning of the calibration coefficient by adopting the preset calibration coefficient diagnosis method, the diagnosis basis is more sufficient, and meanwhile, the diagnosis is carried out by adopting the preset plateau slope diagnosis method, so that the problem of insufficient basis for judging by only the deviation or exceeding of plateau slope abnormality is solved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic flow chart of a method for diagnosing a fault of a mini-fission ionization chamber according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of diagnosing the micro fission ionization chamber to be diagnosed by using a preset calibration coefficient diagnosis method according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset plateau slope diagnosis method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a measured current of an MFC provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a mini-fission ionization chamber fault diagnosis system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a fault diagnosis method for a miniature fission ionization chamber, which solves the problem that the basis for judging the unavailability of the miniature fission ionization chamber is insufficient when the coefficient of any calibration exceeds the standard; the problem of insufficient basis for judging the unavailability of a new miniature fission ionization chamber when the slope of any plateau is excessively large or exceeds the standard is solved; the method solves the problems that the method for diagnosing faults of the miniature fission ionization chamber according to the plateau slope and the calibration coefficient is too simple, the electrical characteristics and the nuclear characteristics of the miniature fission ionization chamber are not fully enveloped, and the risk of misdiagnosis exists; the problem that an effective fault diagnosis flow is lacking when a worker performs fault diagnosis of the miniature fission ionization chamber is solved.
Referring to fig. 1, a schematic flow chart of an alternative embodiment of a fault diagnosis method for a mini-fission ionization chamber according to the present invention is shown.
Specifically, the fault diagnosis method for the miniature fission ionization chamber comprises the following steps:
and step S101, monitoring each micro fission ionization chamber in the same pressurized water reactor nuclear motor unit, and judging whether the micro fission ionization chambers have abnormal calibration coefficients or plateau slope.
Wherein, the correction coefficient or the plateau slope abnormality indicates that the parameter exceeds or is close to exceeding (abnormality is larger).
In the embodiment of the invention, the monitoring and judging method of whether the correction coefficient or the plateau inclination abnormality occurs to all the micro fission ionization chambers in the same pressurized water reactor nuclear power unit can be adopted, and the invention is not particularly limited.
Step S102, if any one of the micro fission ionization chambers in the same pressurized water reactor nuclear power unit fails, the failure type of the micro fission ionization chamber to be diagnosed is obtained. The miniature fission ionization chamber to be diagnosed is a miniature fission ionization chamber with abnormal calibration coefficients or plateau slope.
In the embodiment of the invention, the fault types of the micro fission ionization chamber include: the correction coefficient exceeds standard, or the plateau slope is abnormal and is bigger or exceeds standard.
And step S103, if the fault type of the micro fission ionization chamber to be diagnosed is that the calibration coefficient exceeds the standard, diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset calibration coefficient diagnosis method.
In some embodiments, if it is detected that the calibration coefficient of any micro-fission ionization chamber in the same pressurized water reactor nuclear power unit exceeds the standard, a preset calibration coefficient diagnosis method is adopted to diagnose the micro-fission ionization chamber with the calibration coefficient exceeding the standard (i.e. diagnose the micro-fission ionization chamber to be diagnosed).
In a preferred embodiment, as shown in fig. 2, if the fault type of the micro-fission ionization chamber to be diagnosed is that the calibration coefficient exceeds the standard, diagnosing the micro-fission ionization chamber to be diagnosed by adopting a preset calibration coefficient diagnosis method includes:
step S201, determining physical significance of the calibration coefficients of the micro fission ionization chamber.
Step S202, determining acceptance criteria for exceeding the calibration coefficients of the micro fission ionization chambers based on the physical significance of the calibration coefficients of the micro fission ionization chambers.
And step S203, diagnosing the miniature fission ionization chamber to be diagnosed according to the acceptance standard with the calibration coefficient exceeding the standard.
Specifically, in some embodiments, determining the physical significance of the calibration coefficients of the mini-fission ionization chamber includes: determining a reference calibration mode of the miniature fission ionization chamber; according to the determined reference calibration mode, controlling all micro fission ionization chambers in the same pressurized water reactor nuclear power unit to enter the same measurement path for calibration; after the calibration is completed, obtaining the average current of each micro fission ionization chamber; comparing the average current of each micro fission ionization chamber with a reference current to obtain a calibration coefficient of each micro fission ionization chamber; acquiring the thermal neutron sensitivity of each micro fission ionization chamber; determining a relationship between the average current and the thermal neutron sensitivity and a thermal neutron fluence average value on a core measurement path based on the average current of each mini-fission ionization chamber and the thermal neutron sensitivity of each mini-fission ionization chamber; and determining the physical significance of the calibration coefficients of the micro fission ionization chambers according to the relation between the calibration coefficients and the average current of each micro fission ionization chamber and the average value of the thermal neutron fluence rate on the core measurement path.
In the embodiment of the invention, according to the working principle of the micro fission ionization chamber, the following steps are known: the relationship between the average current and the thermal neutron sensitivity and the average value of the thermal neutron fluence rate on the core measurement path satisfies the following conditions: the average current of each mini-fission ionization chamber is equal to the product of the thermal neutron sensitivity and the average of the thermal neutron fluence rates on the core measurement path.
In the embodiment of the invention, the physical significance of the calibration coefficients of the micro fission ionization chamber is as follows: normalized thermal neutron sensitivity of any mini-fission ionization chamber in the same unit relative to a reference thermal neutron sensitivity. Thus, by examining the calibration coefficients, a relative change in thermal neutron sensitivity of the mini-fission ionization chamber (MFC) can be found.
In the embodiment of the invention, the acceptance criterion for the calibration coefficient of the micro fission ionization chamber exceeding the standard is as follows: if the calibration coefficient of the micro fission ionization chamber is in the reference coefficient range, judging that the calibration coefficient of the micro fission ionization chamber is not out of standard; and if the calibration coefficient of the micro-fission ionization chamber exceeds the reference coefficient range, judging that the calibration coefficient of the micro-fission ionization chamber exceeds the standard. Wherein, the reference coefficient range is: [0.92,1.08]. Therefore, when the calibration coefficient of the MFC is within [0.92,1.08], the calibration coefficient of the MFC is not out of specification; when the calibration coefficient of the MFC is not within [0.92,1.08], the calibration coefficient of the MFC exceeds the standard.
In some embodiments, diagnosing the mini-fission ionization chamber to be diagnosed according to acceptance criteria with a calibration coefficient exceeding the standard includes: acquiring factory thermal neutron sensitivity of a miniature fission ionization chamber to be diagnosed; acquiring a reference thermal neutron sensitivity; calculating the calibration coefficient of the micro fission ionization chamber to be diagnosed according to the factory thermal neutron sensitivity and the reference thermal neutron sensitivity of the micro fission ionization chamber to be diagnosed; comparing the calibration coefficient of the micro fission ionization chamber to be diagnosed with a reference coefficient; and diagnosing the micro fission ionization chamber to be diagnosed according to the comparison result.
Wherein, if the comparison result is: and if the calibration coefficient of the micro fission ionization chamber to be diagnosed exceeds the reference coefficient range, the method comprises the following steps: acquiring an automatic calibration coefficient of a miniature fission ionization chamber to be diagnosed; the automatic calibration coefficient is a calibration coefficient calculated by a neutron measurement system; if the calibration coefficient of the micro fission ionization chamber to be diagnosed is the same as the automatic calibration coefficient, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the overproof of the calibration coefficient is that the relative deviation of the thermal neutron sensitivity of the factory is too large, and the miniature fission ionization chamber to be diagnosed is available.
If the comparison result is: the calibration coefficients of the mini-fission ionization chamber to be diagnosed are within the reference coefficient range, then: comparing the calibration coefficients of the miniature fission ionization chamber to be diagnosed with the upper limit value and the lower limit value of the reference coefficient range respectively; if the difference value between the calibration coefficient and the upper limit value of the micro-fission ionization chamber to be diagnosed is within a preset range or the difference value between the calibration coefficient and the lower limit value of the micro-fission ionization chamber to be diagnosed is within a preset range, the diagnosis result of the micro-fission ionization chamber to be diagnosed is as follows: the reason for the exceeding of the calibration coefficient is that the thermal neutron sensitivity variation is different between the micro fission ionization chamber to be diagnosed and the standard micro fission chamber in the running process of the unit, and the micro fission ionization chamber to be diagnosed is not available only by the calibration coefficient. Wherein the upper limit value is 1.08 and the lower limit value is 0.92.
Alternatively, if the comparison result is: the calibration coefficients of the mini-fission ionization chamber to be diagnosed are within the reference coefficient range, then: comparing the calibration coefficient of the miniature fission ionization chamber to be diagnosed with a preset value; if the difference value between the calibration coefficient and the preset value of the micro fission ionization chamber to be diagnosed is in the deviation range, the diagnosis result of the micro fission ionization chamber to be diagnosed is as follows: the reason for the overproof of the calibration coefficient is that the difference of the thermal neutron sensitivity variation of the micro fission ionization chamber to be diagnosed and the reference micro fission chamber is larger than a threshold value in the running process of the micro fission chamber in the unit. The threshold value can be determined according to actual needs, and the fact that the difference of thermal neutron sensitivity variation is too large in the running process of the unit can be judged. Wherein the preset value is 1.0.
If the difference of thermal neutron sensitivity variation of the micro fission ionization chamber to be diagnosed in the running process of the unit is larger than a threshold value, the thermal neutron sensitivity variation is: comparing the automatic calibration coefficient of the miniature fission ionization chamber to be diagnosed with the upper limit value of the reference coefficient range; if the automatic calibration coefficient is larger than the upper limit value, the diagnosis result of the micro fission ionization chamber to be diagnosed is as follows: the reason for the exceeding of the calibration coefficient is that the thermal neutron sensitivity of the reference mini-fission ionization chamber is abnormally reduced, and the reference mini-fission ionization chamber is not available.
Or if the difference of thermal neutron sensitivity variation of the micro fission ionization chamber to be diagnosed in the running process of the unit is larger than a threshold value, the thermal neutron sensitivity variation is: comparing the automatic calibration coefficient of the miniature fission ionization chamber to be diagnosed with the lower limit value of the reference coefficient range; if the automatic calibration coefficient is smaller than the lower limit value, the diagnosis result of the micro fission ionization chamber to be diagnosed is as follows: the reason for the overproof of the calibration coefficient is that the thermal neutron sensitivity of the micro-fission ionization chamber to be diagnosed is abnormally reduced, and the micro-fission ionization chamber to be diagnosed is not available.
In one specific embodiment, 5 new micro fission ionization chambers (assumed to be No. 1-5 MFCs) are installed in the same pressurized water reactor nuclear motor unit at the same time, and when the calibration coefficient of one micro fission ionization chamber exceeds the standard, the specific steps of fault diagnosis are as follows:
The first step: the physical significance of the calibration coefficients of the mini-fission ionization chamber is determined. I.e. a normalized value of the thermal neutron sensitivity of a certain MFC in the same set with respect to the thermal neutron sensitivity of the MFC selected as the reference. The formula can be expressed as:
C n ＝S n /S 1 (1)
wherein C represents the calibration coefficient, S represents the thermal neutron sensitivity, n=1, 2,3,4,5.
Wherein, the physical meaning of the calibration coefficient of the micro fission ionization chamber can be determined according to the following steps:
and A1, selecting a calibration mode of a Neutron Measurement System (NMS) as a reference calibration mode, so that all micro fission ionization chambers of the same unit enter the same measurement path for calibration.
Step A2, after the reference calibration is completed,the average current collected by each MFC in the process of calibration is obtained through NMS (network management system) search, namely the average current of the first MFC is I 1 The average current of the second MFC is I 2 The average current of the third MFC is I 3 Average current of fourth MFC is I 4 The average current of the fifth MFC is I 5 。
Step A3, obtaining the thermal neutron sensitivity of each MFC when leaving the factory, wherein the thermal neutron sensitivity of the No. 1-5 MFC when leaving the factory is respectively expressed as: s is S 1 、S 2 、S 3 、S 4 、S 5 。
Step A4, average current I of MFC No. 1 1 To calculate the reference of the calibration coefficients, I will be 1 、I 2 、I 3 、I 4 、I 5 Respectively with I 1 Comparing to obtain corresponding correction coefficient C 1 、C 2 、C 3 、C 4 、C 5 C, i.e n ＝I n /I 1 (n＝1，2，3，4，5)。
Step A5, knowing from the working principle of the MFC that the average current is equal to the product of the thermal neutron sensitivity and the thermal neutron fluence rate average value (phi) on the core measurement path, i.e. I n ＝S n *Φ(n＝1，2，3，4，5)。
Step A6, step A4 and step A5 can obtain formula (1).
And a second step of: as can be seen from the formula (1), S in the same unit 2 、S 3 、S 4 、S 5 Relative to S 1 The absolute value of the deviation of (c) must be less than 8% to meet the acceptance criteria for the calibration coefficients.
Therefore, it can be known from the acceptance criteria obtained in the second step that: the limitation exists only according to the application range of the calibration coefficient acceptance standard, and the MFC cannot be judged to be unavailable only according to the fact that the calibration coefficient of the MFC exceeds the range of [0.92,1.08 ].
And a third step of: when it is determined that the calibration coefficient of any one of the 5 MFCs exceeds the range of [0.92,1.08] (i.e., the calibration coefficient exceeds the standard), the calibration coefficient of the MFC to be diagnosed should be calculated using formula (1) according to the factory thermal neutron sensitivity of the MFC (mini-fission ionization chamber to be diagnosed) whose calibration coefficient exceeds the standard and the factory thermal neutron sensitivity of the MFC selected as the reference.
Fourth step: if the calibration coefficient of the MFC to be diagnosed calculated in the third step is substantially the same as the automatic calibration coefficient, the reason for the exceeding of the calibration coefficient of the MFC to be diagnosed is: the relative deviation of the thermal neutron sensitivity of the factory is too large, and the diagnosis result at the moment is as follows: the MFC to be diagnosed is available.
Fifth step: if the calibration coefficient of the MFC to be diagnosed calculated in the third step is not out of standard, but is relatively close to the upper limit value or the lower limit value, the reason for the out of standard calibration coefficient is as follows: and the MFC is caused by the difference of thermal neutron sensitivity variation after running for a period of time in the unit, and the MFC is not judged to be unavailable only when the calibration coefficient exceeds the standard.
Sixth step: if the calibration coefficient of the MFC to be diagnosed calculated in the third step is not out of standard and is about 1.0, the reason for the out of standard calibration coefficient is that the difference of the thermal neutron sensitivity variation is too large after the MFC runs in the unit for a period of time, and the thermal neutron sensitivity of the MFC is known to gradually decrease after the MFC is put into operation in the unit, so that fault diagnosis should be performed according to the variation direction of the calibration coefficient measured by the NMS in this case.
Seventh step: if the sixth step occurs, when the calibration coefficient measured by the NMS is greater than 1.08, the fault diagnosis result is that the thermal neutron sensitivity of the MFC as a reference is abnormally lowered, and the MFC as a reference is not available.
Eighth step: if the situation described in the step [11] occurs, when the calibration coefficient measured by the NMS is smaller than 0.92, the fault diagnosis result is that the thermal neutron sensitivity of the MFC with the over-standard calibration coefficient is abnormally reduced, and the MFC with the over-standard calibration coefficient is not available.
And step S104, if the fault type of the micro-fission ionization chamber to be diagnosed is that the plateau slope abnormality is large or exceeds the standard, diagnosing the micro-fission ionization chamber to be diagnosed by adopting a preset plateau slope diagnosis method.
In some embodiments, if the same pressurized water reactor nuclear power unit is monitoredIs abnormally large (more than 0.10%. V) -1 ) Or exceeds the standard (exceeding 0.20%. V) -1 ) And when the micro fission ionization chamber to be diagnosed is diagnosed by adopting a preset plateau diagnosis method.
In a preferred embodiment, as shown in fig. 3, if the fault type of the mini-fission ionization chamber to be diagnosed is that the plateau slope abnormality is large or exceeds the standard, diagnosing the mini-fission ionization chamber to be diagnosed by adopting a preset plateau slope diagnosis method includes:
step S301, obtaining electrical parameters of the micro fission ionization chamber to be diagnosed.
And step S302, judging whether the electrical characteristics of the micro fission ionization chamber to be diagnosed are qualified or not according to the electrical parameters.
And step S303, if not, diagnosing the micro fission ionization chamber to be diagnosed based on the electrical characteristics.
And step S304, if yes, acquiring nuclear characteristic parameters of the micro fission ionization chamber to be diagnosed.
And step S305, diagnosing the micro fission ionization chamber to be diagnosed according to the nuclear characteristic parameters.
Optionally, in an embodiment of the present invention, the electrical parameter includes: the mini-fission ionization chamber to be diagnosed and its insulation resistance of its measuring circuit.
Wherein, judge whether the electric characteristic of the miniature fission ionization chamber to be diagnosed is qualified according to the electric parameter includes: comparing insulation resistance of a micro fission ionization chamber to be diagnosed and a measuring loop thereof with a reference resistance value; and if the insulation resistance of the micro fission ionization chamber to be diagnosed and the measurement loop thereof is smaller than the reference resistance, judging that the electrical characteristics of the micro fission ionization chamber to be diagnosed are unqualified. Diagnosing the mini-fission ionization chamber to be diagnosed based on the electrical characteristic includes: if the insulation resistance of the micro fission ionization chamber to be diagnosed and the measuring loop thereof is smaller than the reference resistance, the diagnosis result of the micro fission ionization chamber to be diagnosed is as follows: the reason for the plateau bias or superscalar is that the insulation resistance of the mini-fission ionization chamber to be diagnosed and its measurement loop is abnormal, and the mini-fission ionization chamber to be diagnosed is not available. Alternatively, the inventionIn an embodiment, the reference resistance may be 10 7 Ω。
Specifically, under the condition that all cables of the MFC and its measuring circuit have been correctly connected, the insulation resistance tester is used to check the insulation resistance of the MFC and its measuring circuit from the cabinet side of the NMS, the voltage used for the check should be not less than the operating voltage of the MFC, and the insulation resistance of the MFC and its measuring circuit should be not less than 10 under normal conditions 9 Omega, when the insulation resistance of the MFC and its measurement loop drops to less than 10 7 And at omega, the fault diagnosis result is unavailable.
Further, in the embodiment of the present invention, the electrical parameters further include: the mini-fission ionization chamber to be diagnosed and its measuring circuit leak current.
Wherein, judge whether the electric characteristic of the miniature fission ionization chamber to be diagnosed is qualified according to the electric parameter includes: comparing leakage current of the micro fission ionization chamber to be diagnosed and a measuring loop thereof with reference current; and if the leakage current of the micro fission ionization chamber to be diagnosed and the measuring loop thereof is larger than the reference current, judging that the electrical characteristics of the micro fission ionization chamber to be diagnosed are unqualified. Diagnosing the mini-fission ionization chamber to be diagnosed based on the electrical characteristic includes: if the leakage current of the micro fission ionization chamber to be diagnosed and the measuring loop thereof is larger than the reference current, the diagnosis result of the micro fission ionization chamber to be diagnosed is as follows: the reason for the plateau bias or superscalar is that the leakage current of the mini-fission ionization chamber to be diagnosed and the measuring circuit thereof is abnormal, and the mini-fission ionization chamber to be diagnosed is not available. Optionally, in an embodiment of the present invention, the reference current may be: 10 -7 A。
Specifically, under the condition that all cables of the MFC and its measurement circuit have been properly connected, the NMS is controlled to travel the MFC to the group selector exit position (run code 2000 code), and the leakage current of the MFC and its measurement circuit is checked from the cabinet side of the NMS using a picoampere meter, and is normally 10 -9 An order of A, when the leakage current of the MFC and the measurement loop reaches 10 -7 At magnitude a, the leakage current was measured relative to the measured current at 10% fp (10 -5 A magnitude) has alreadyCannot be ignored, and the fault diagnosis result is unavailable.
Further, in the embodiment of the present invention, the electrical parameters further include: the mini-fission ionization chamber to be diagnosed and its measurement loop capacitance.
Wherein, judge whether the electric characteristic of the miniature fission ionization chamber to be diagnosed is qualified according to the electric parameter includes: judging whether the capacitance of the micro fission ionization chamber to be diagnosed and the measuring loop thereof is in the range of a reference capacitance; and if the capacitance of the micro fission ionization chamber to be diagnosed and the measuring loop thereof are not in the reference capacitance range, judging that the electrical characteristics of the micro fission ionization chamber to be diagnosed are unqualified. Diagnosing the mini-fission ionization chamber to be diagnosed based on the electrical characteristic includes: if the capacitance of the micro fission ionization chamber to be diagnosed and the measuring loop thereof is not in the reference capacitance range, the diagnosis result of the micro fission ionization chamber to be diagnosed is as follows: the reason for the plateau bias or superscalar is that the gap between the high voltage electrode and the collector of the mini-fission ionization chamber to be diagnosed is abnormal, and the mini-fission ionization chamber to be diagnosed is not available. Optionally, in an embodiment of the present invention, the reference capacitance range may be: [15.5,18.5] nF.
Specifically, under the condition that all cables of the MFC and the measuring loop thereof are correctly connected, a capacitance tester is used for checking the capacitance of the MFC and the measuring loop thereof, under normal conditions, the capacitance of the MFC and the measuring loop thereof is [15.5,18.5] nF, when the capacitance exceeds the range of [15.5,18.5] nF, the abnormal change of the gap between the high-voltage electrode and the collector of the MFC is indicated, and the fault diagnosis result is unavailable.
Further, when all of the above-mentioned electrical parameter checks are passed, it is indicated that the electrical characteristics of the mini-fission ionization chamber to be diagnosed are passed, in which case it is also necessary to check the nuclear characteristics of the MFC. Wherein the nuclear characteristic parameters for fault diagnosis include: measurement current and plateau of MFC.
Specifically, diagnosing the mini-fission ionization chamber to be diagnosed according to the nuclear characteristic parameter includes: obtaining a measurement current of a miniature fission ionization chamber to be diagnosed; judging whether the measured current of the micro fission ionization chamber to be diagnosed has a step value or a peak value; if yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the large plateau inclination or exceeding the standard is that the measured current is abnormal, and the miniature fission ionization chamber to be diagnosed is not available; if not, diagnosing the micro fission ionization chamber to be diagnosed according to the plateau slope.
Further, in an embodiment of the present invention, diagnosing the mini-fission ionization chamber to be diagnosed according to the plateau slope includes: controlling a miniature fission ionization chamber to be diagnosed to execute a pretreatment task; after finishing the pretreatment task, obtaining the plateau angle of the micro fission ionization chamber to be diagnosed after pretreatment; diagnosing the mini-fission ionization chamber to be diagnosed based on the pretreated plateau slope.
Wherein diagnosing the mini-fission ionization chamber to be diagnosed based on the preprocessed plateau slope comprises: judging whether the preprocessed plateau slope is in a first plateau slope range or not; if yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason why the plateau is inclined to a large extent or exceeds the standard is that the nuclear characteristics of the micro-fission ionization chamber to be diagnosed are abnormal due to the fact that trace impurity gas enters the sensitive body, and when the plateau of the micro-fission ionization chamber to be diagnosed is restored to a normal range, the micro-fission ionization chamber to be diagnosed is restored to a usable state.
In some embodiments, diagnosing the mini-fission ionization chamber to be diagnosed based on the pretreated plateau slope includes: judging whether the preprocessed plateau slope is in a second plateau slope range or not; if yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the micro-fission ionization chamber to be diagnosed is faulty and available, and is replaced at a preset maintenance time period.
In some embodiments, diagnosing the mini-fission ionization chamber to be diagnosed based on the pretreated plateau slope includes: judging whether the preprocessed plateau slope is larger than an upper limit value of the plateau slope or not; if yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the plateau bias or superscalar is that the mini-fission ionization chamber to be diagnosed is not available.
In some embodiments, diagnosing the mini-fission ionization chamber to be diagnosed based on the pretreated plateau slope further includes: after the micro fission ionization chamber to be diagnosed is replaced in a preset maintenance time period, acquiring a replaced plateau slope; judging whether the replaced plateau slope is in a first plateau slope range or not; if the replaced plateau slope is within the first plateau slope range, the diagnosis result of the micro fission ionization chamber to be diagnosed is as follows: the mini-fission ionization chamber to be diagnosed is available.
In some embodiments, diagnosing the mini-fission ionization chamber to be diagnosed based on the pretreated plateau slope further includes: after the micro fission ionization chamber to be diagnosed is replaced in a preset maintenance time period, acquiring a replaced plateau slope; judging whether the replaced plateau slope is in a second plateau slope range or not; if the replaced plateau slope is within the second plateau slope range, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the mini-fission ionization chamber to be diagnosed is available, and aging management of the mini-fission ionization chamber to be diagnosed is started, and the mini-fission ionization chamber to be diagnosed is replaced in a preset maintenance time period.
In some embodiments, diagnosing the mini-fission ionization chamber to be diagnosed based on the pretreated plateau slope further includes: after the micro fission ionization chamber to be diagnosed is replaced in a preset maintenance time period, acquiring a replaced plateau slope; judging whether the replaced plateau slope is larger than the upper limit value of the plateau slope or not; if the replaced plateau slope is greater than the plateau slope upper limit value, the diagnosis result of the micro fission ionization chamber to be diagnosed is as follows: the mini-fission ionization chamber to be diagnosed is not available.
In one embodiment, the process of performing the core characterization includes the steps of:
the first step: checking the measured current acquired by the micro fission ionization chamber to be diagnosed after the neutron fluence rate measurement of a certain measuring path is completed, wherein the normal measured current is a smoother curve (s 1 curve in the figure), and when the measured current has step change or peak (s 2 curve and s3 curve in the figure), the diagnosis result is unavailable.
And a second step of: the new MFC developed a plateau inclined abnormality bias (exceeding 0.10%. V) at the early stage of operation -1 ) Or when the fault is out of standard, after the electrical characteristics are removed and the current faults are measuredThe diagnosed MFC should be fed into the core to perform several measurement tasks under higher nuclear power conditions, and the neutron decomposition of the core consumes impurity gases within the sensitivity of the MFC. I.e. to perform a pretreatment of the mini-fission ionization chamber to be diagnosed.
And a third step of: according to [06 ]]After the treatment of the method of step (a) if the plateau of the diagnosed MFC can be restored [0.02,0.10 ]]％·V -1 If the diagnostic result is that a trace amount of impurity gas enters the sensitive body to cause abnormal change in nuclear characteristics of MFC, and when the diagnosed plateau is restored to a relatively ideal level, MFC is restored to a usable state.
Fourth step: after treatment according to the method of the third step, if the plateau of the diagnosed MFC is still between (0.10,0.20)%. V -1 The diagnostic result is available, but the diagnosed MFC should be replaced in an appropriate maintenance window.
Fifth step: after treatment according to the method of the third step, if the plateau of the diagnosed MFC is still out of specification, the diagnostic result is not available.
Sixth step: after the problem of the plateau slope exceeding of the MFC which normally operates for a period of time under the 100% FP working condition, the working voltage of the MFC is adjusted to be not smaller than the value of the actual saturated voltage on the premise of eliminating the electrical characteristics and measuring the current faults.
Seventh step: after completion of the fourth step, if the plateau of the diagnosed MFC can be restored to [0.02,0.10 ]]％·V -1 Within a range of (1), the diagnostic result is available.
Eighth step: after completion of the fourth step, if the plateau of the diagnosed MFC can be restored to (0.10,0.20)%. V -1 If the diagnostic result is available, but the MFC aging management should be started, and the diagnosed MFC should be replaced in an appropriate maintenance window.
Ninth step: after completion of the fourth step, if the plateau of the diagnosed MFC is still out of specification, the diagnostic result is not available.
As shown in fig. 5, a schematic structural diagram of an alternative embodiment of a mini-fission ionization chamber fault diagnosis system according to the present invention is provided. The micro fission ionization chamber fault diagnosis system can be applied to the micro fission ionization chamber fault diagnosis method disclosed by the embodiment of the invention.
Specifically, the micro fission ionization chamber fault diagnosis system includes:
and the monitoring unit 501 is used for monitoring each micro fission ionization chamber in the same pressurized water reactor nuclear power unit and judging whether the micro fission ionization chamber has abnormal calibration coefficient or plateau slope.
And the obtaining unit 502 is configured to obtain a fault type of the mini-fission ionization chamber to be diagnosed when a calibration coefficient or a plateau slope abnormality occurs in any mini-fission ionization chamber in the same pressurized water reactor nuclear power unit. The miniature fission ionization chamber to be diagnosed is a miniature fission ionization chamber with abnormal calibration coefficients or plateau slope.
And the first diagnosing unit 503 is configured to diagnose the micro fission ionization chamber to be diagnosed by adopting a preset calibration coefficient diagnosing method when the fault type of the micro fission ionization chamber to be diagnosed is that the calibration coefficient exceeds the standard.
And a second diagnosis unit 504, configured to diagnose the micro-fission ionization chamber to be diagnosed by adopting a preset plateau slope diagnosis method if the fault type of the micro-fission ionization chamber to be diagnosed is that the plateau slope abnormality is large or exceeds the standard.
The disclosed fault diagnosis method for the miniature fission ionization chamber has the advantages that the physical significance of the calibration coefficient of the MFC and the calculation method of the calibration coefficient are clear, the limitation of performing fault diagnosis on the MFC according to the calibration coefficient acceptance standard given by equipment suppliers is pointed out, the method for performing fault diagnosis on the MFC by using the calibration coefficient is redesigned, the executable performance of the fault diagnosis method for the MFC is improved, and the error diagnosis rate of performing fault diagnosis on the MFC by directly using the calibration coefficient acceptance standard can be reduced. The method has been verified in the first starting process of a 1000 MW-level improved pressurized water reactor nuclear motor unit, the problem of misdiagnosis caused by the fact that the calibration coefficient exceeds the standard due to the difference of factory thermal neutron sensitivity of the MFC is avoided, and the calibration coefficient of the MFC is not used as a single technical index for diagnosing whether the MFC is available or not in the nuclear power unit subordinate to the China Guangxi group limited company.
Meanwhile, the electrical characteristics and the nuclear characteristics of the MFC are systematically researched, the insulation resistance, the leakage current and the capacitance of an MFC measurement loop are selected as electrical characteristic parameters for fault diagnosis, the plateau slope and the measurement current of the MFC are selected as nuclear characteristic parameters for fault diagnosis, and corresponding acceptance criteria are defined.
In addition, on the premise that the electrical characteristic faults of the diagnosed MFC are eliminated, the processing method that the diagnosed MFC is sent into the reactor core to execute a plurality of measurement tasks under the working condition of higher nuclear power is provided for the problem that the plateau slope of the new MFC is abnormal and is bigger or exceeds standard at the initial stage of operation, and the impurity gas in the sensitivity of the MFC is consumed by neutron decomposition of the reactor core.
Further, a method for performing fault diagnosis according to the electrical characteristics, the nuclear characteristics related parameters and the acceptance criteria of the MFC is provided, wherein the method provides that the electrical characteristics of the MFC are checked firstly when the fault diagnosis is performed, and the nuclear characteristics of the MFC are checked after the electrical characteristics are removed, so that the working logic relation of the fault diagnosis of the MFC is straightened; meanwhile, the conditions possibly encountered during fault diagnosis are analyzed, and diagnosis methods are respectively provided.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made with the scope of the claims should be covered by the claims.

Claims (21)

1. A method for diagnosing a fault in a mini-fission ionization chamber, comprising the steps of:
monitoring each micro fission ionization chamber in the same pressurized water reactor nuclear motor unit, and judging whether the micro fission ionization chambers have abnormal correction coefficients or plateau inclination;
if any one of the micro fission ionization chambers in the same pressurized water reactor nuclear power unit is abnormal in calibration coefficient or plateau slope, the fault type of the micro fission ionization chamber to be diagnosed is obtained; the miniature fission ionization chamber to be diagnosed is a miniature fission ionization chamber with abnormal correction coefficient or plateau slope;
if the fault type of the micro fission ionization chamber to be diagnosed is that the calibration coefficient exceeds the standard, diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset calibration coefficient diagnosis method;
and if the fault type of the micro fission ionization chamber to be diagnosed is that the plateau slope is abnormal and is larger or exceeds the standard, diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset plateau slope diagnosis method.
2. The method according to claim 1, wherein if the type of the fault of the mini-fission ionization chamber to be diagnosed is that the calibration coefficient exceeds the standard, diagnosing the mini-fission ionization chamber to be diagnosed by using a preset calibration coefficient diagnosis method comprises:
determining the physical meaning of the calibration coefficient of the miniature fission ionization chamber; the physical significance of the calibration coefficients of the miniature fission ionization chamber is as follows: normalized value of thermal neutron sensitivity of any micro fission ionization chamber in the same unit relative to reference thermal neutron sensitivity;
determining acceptance criteria for the calibration coefficients of the mini-fission ionization chambers to exceed the standard based on the physical significance of the calibration coefficients of the mini-fission ionization chambers;
and diagnosing the miniature fission ionization chamber to be diagnosed according to the acceptance standard with the standard exceeding the calibration coefficient.
3. The method of claim 2, wherein determining the physical significance of the calibration coefficients of the mini-fission ionization chamber comprises:
determining a reference calibration mode of the miniature fission ionization chamber;
according to the determined reference calibration mode, controlling all micro fission ionization chambers in the same pressurized water reactor nuclear power unit to enter the same measurement path for calibration;
After the calibration is completed, obtaining the average current of each micro fission ionization chamber;
comparing the average current of each micro fission ionization chamber with the reference current to obtain a calibration coefficient of each micro fission ionization chamber;
acquiring the thermal neutron sensitivity of each micro fission ionization chamber;
determining the relationship between the average current and the thermal neutron sensitivity and the thermal neutron fluence average value on the reactor core measuring path based on the average current of each micro-fission ionization chamber and the thermal neutron sensitivity of each micro-fission ionization chamber;
and determining the physical significance of the calibration coefficients of the micro fission ionization chambers according to the relationship between the calibration coefficients of each micro fission ionization chamber and the average current and the average thermal neutron sensitivity and the average thermal neutron fluence rate on the reactor core measuring path.
4. The method of claim 3, wherein the average current and thermal neutron sensitivity versus thermal neutron fluence rate average over the core measurement path satisfy the following relationships:
the average current of each mini-fission ionization chamber is equal to the product of the thermal neutron sensitivity and the average of the thermal neutron fluence rates on the core measurement path.
5. The method for diagnosing a fault in a mini-fission ionization chamber according to claim 2, wherein the acceptance criteria for the correct and correct coefficients of the mini-fission ionization chamber are:
if the calibration coefficient of the micro fission ionization chamber is in the reference coefficient range, judging that the calibration coefficient of the micro fission ionization chamber is not out of standard;
and if the calibration coefficient of the miniature fission ionization chamber exceeds the reference coefficient range, judging that the calibration coefficient of the miniature fission ionization chamber exceeds the standard.
6. The method of claim 5, wherein said diagnosing the mini-fission ionization chamber to be diagnosed according to acceptance criteria for which the calibration coefficients exceed standards comprises:
acquiring factory thermal neutron sensitivity of a miniature fission ionization chamber to be diagnosed;
acquiring a reference thermal neutron sensitivity;
calculating a calibration coefficient of the micro fission ionization chamber to be diagnosed according to the factory thermal neutron sensitivity and the reference thermal neutron sensitivity of the micro fission ionization chamber to be diagnosed;
comparing the calibration coefficient of the mini-fission ionization chamber to be diagnosed with the reference coefficient;
and diagnosing the micro fission ionization chamber to be diagnosed according to the comparison result.
7. The method of claim 6, wherein diagnosing the mini-fission ionization chamber to be diagnosed based on the comparison result comprises:
if the comparison result is: and if the calibration coefficient of the micro fission ionization chamber to be diagnosed exceeds the reference coefficient range, then:
acquiring an automatic calibration coefficient of the miniature fission ionization chamber to be diagnosed; the automatic calibration coefficient is a calibration coefficient calculated by a neutron measurement system;
if the calibration coefficient of the micro fission ionization chamber to be diagnosed is the same as the automatic calibration coefficient, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the overproof of the calibration coefficient is that the relative deviation of the thermal neutron sensitivity of the factory is too large, and the miniature fission ionization chamber to be diagnosed is available.
8. The method of claim 6, wherein diagnosing the mini-fission ionization chamber to be diagnosed based on the comparison result comprises:
if the comparison result is: the calibration coefficients of the micro fission ionization chamber to be diagnosed are within the reference coefficient range, then:
Comparing the calibration coefficients of the micro fission ionization chamber to be diagnosed with the upper limit value and the lower limit value of the reference coefficient range respectively;
if the difference value between the calibration coefficient of the micro-fission ionization chamber to be diagnosed and the upper limit value is within a preset range or the difference value between the calibration coefficient of the micro-fission ionization chamber to be diagnosed and the lower limit value is within a preset range, the diagnosis result of the micro-fission ionization chamber to be diagnosed is as follows: the reason for the overproof of the calibration coefficient is that the thermal neutron sensitivity variation of the micro fission ionization chamber to be diagnosed and the standard micro fission chamber are different in the running process of the unit.
9. The method of claim 6, wherein diagnosing the mini-fission ionization chamber to be diagnosed based on the comparison result comprises:
if the comparison result is: the calibration coefficients of the micro fission ionization chamber to be diagnosed are within the reference coefficient range, then:
comparing the calibration coefficient of the miniature fission ionization chamber to be diagnosed with a preset value;
if the difference value between the calibration coefficient of the micro fission ionization chamber to be diagnosed and the preset value is in the deviation range, the diagnosis result of the micro fission ionization chamber to be diagnosed is as follows: the reason for the overproof of the calibration coefficient is that the difference of the thermal neutron sensitivity variation of the micro-fission ionization chamber to be diagnosed and the reference micro-fission ionization chamber is larger than a threshold value in the running process of the micro-fission ionization chamber in the unit.
10. The method of claim 9, wherein diagnosing the mini-fission ionization chamber to be diagnosed based on the comparison result further comprises:
if the difference of thermal neutron sensitivity variation of the micro fission ionization chamber to be diagnosed in the running process of the unit is larger than a threshold value, then:
comparing the automatic calibration coefficient of the micro fission ionization chamber to be diagnosed with the upper limit value of the reference coefficient range;
if the automatic calibration coefficient is greater than the upper limit value, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the exceeding of the calibration coefficient is that the thermal neutron sensitivity of the reference mini-fission ionization chamber is abnormally reduced, and the reference mini-fission ionization chamber is not available.
11. The method of claim 9, wherein diagnosing the mini-fission ionization chamber to be diagnosed based on the comparison result further comprises:
if the difference of thermal neutron sensitivity variation of the micro fission ionization chamber to be diagnosed in the running process of the unit is larger than a threshold value, then:
comparing the automatic calibration coefficient of the micro fission ionization chamber to be diagnosed with the lower limit value of the reference coefficient range;
If the automatic calibration coefficient is smaller than the lower limit value, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the exceeding of the calibration coefficient is that the thermal neutron sensitivity of the micro-fission ionization chamber to be diagnosed is abnormally reduced, and the micro-fission ionization chamber to be diagnosed is not available.
12. The method of claim 1, wherein if the type of fault of the mini-fission ionization chamber to be diagnosed is a plateau slope abnormality deviation or a plateau slope exceeding, diagnosing the mini-fission ionization chamber to be diagnosed by a preset plateau slope diagnosis method comprises:
acquiring electrical parameters of the micro fission ionization chamber to be diagnosed;
judging whether the electrical characteristics of the micro fission ionization chamber to be diagnosed are qualified or not according to the electrical parameters;
if not, diagnosing the micro fission ionization chamber to be diagnosed based on the electrical characteristics;
if yes, acquiring nuclear characteristic parameters of the micro fission ionization chamber to be diagnosed;
and diagnosing the micro fission ionization chamber to be diagnosed according to the nuclear characteristic parameter.
13. The method of claim 12, wherein the electrical parameters comprise: a failed mini-fission ionization chamber and an insulation resistance of a measurement loop thereof;
The judging whether the electrical characteristics of the micro fission ionization chamber to be diagnosed are qualified according to the electrical parameters comprises the following steps:
comparing the insulation resistance of the micro fission ionization chamber to be diagnosed and the measurement loop thereof with a reference resistance value;
if the insulation resistance of the micro fission ionization chamber to be diagnosed and the measurement loop thereof is smaller than the reference resistance, judging that the electrical characteristics of the micro fission ionization chamber to be diagnosed are unqualified;
the diagnosing the mini-fission ionization chamber to be diagnosed based on the electrical characteristic includes:
if the insulation resistance of the micro fission ionization chamber to be diagnosed and the measurement loop thereof is smaller than the reference resistance, the diagnosis result of the micro fission ionization chamber to be diagnosed is that: plateau bias is large or exceeds standard because insulation resistance of the micro-fission ionization chamber to be diagnosed and a measuring loop thereof is abnormal, and the micro-fission ionization chamber to be diagnosed is not available.
14. The method of claim 12, wherein the electrical parameters comprise: a failed mini-fission ionization chamber and its leakage current of its measurement loop;
the judging whether the electrical characteristics of the micro fission ionization chamber to be diagnosed are qualified according to the electrical parameters comprises the following steps:
Comparing leakage current of the miniature fission ionization chamber of the barrier to be diagnosed and a measuring loop of the miniature fission ionization chamber with reference current;
if the leakage current of the micro fission ionization chamber to be diagnosed and the measuring loop thereof is larger than the reference current, judging that the electrical characteristics of the micro fission ionization chamber to be diagnosed are unqualified;
the diagnosing the mini-fission ionization chamber to be diagnosed based on the electrical characteristic includes:
if the leakage current of the micro fission ionization chamber to be diagnosed and the measuring loop thereof is larger than the reference current, the diagnosis result of the micro fission ionization chamber to be diagnosed is that: plateau bias is large or exceeds standard because of abnormal leakage current of the micro-fission ionization chamber to be diagnosed and a measuring loop thereof, and the micro-fission ionization chamber to be diagnosed is not available.
15. The method of claim 12, wherein the electrical parameters comprise: a failed mini-fission ionization chamber and a capacitance of a measurement loop thereof;
the judging whether the electrical characteristics of the micro fission ionization chamber to be diagnosed are qualified according to the electrical parameters comprises the following steps:
judging whether the capacitance of the micro fission ionization chamber to be diagnosed and the measuring loop thereof is in a reference capacitance range or not;
If the capacitance of the micro fission ionization chamber to be diagnosed and the measuring loop thereof are not in the reference capacitance range, judging that the electrical characteristics of the micro fission ionization chamber to be diagnosed are unqualified;
the diagnosing the mini-fission ionization chamber to be diagnosed based on the electrical characteristic includes:
if the capacitance of the micro fission ionization chamber to be diagnosed and the measurement loop thereof is not in the reference capacitance range, the diagnosis result of the micro fission ionization chamber to be diagnosed is: plateau bias is large or exceeds standard because the gap between the high voltage electrode and the collector of the mini-fission ionization chamber to be diagnosed is abnormal, and the mini-fission ionization chamber to be diagnosed is not available.
16. The method of claim 12, wherein the nuclear characterization parameters of the mini-fission ionization chamber to be diagnosed include: measuring current and plateau slope;
the diagnosing the mini-fission ionization chamber to be diagnosed according to the nuclear characteristic parameter includes:
acquiring the measured current of the micro fission ionization chamber to be diagnosed;
judging whether the measured current of the micro fission ionization chamber to be diagnosed has a step value or a peak value;
If yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the large plateau tilt or exceeding the standard is that the measured current is abnormal, and the miniature fission ionization chamber to be diagnosed is not available;
and if not, diagnosing the micro fission ionization chamber to be diagnosed according to the plateau slope.
17. The method of claim 16, wherein said diagnosing the mini-fission ionization chamber to be diagnosed according to the plateau comprises:
controlling the miniature fission ionization chamber to be diagnosed to execute a preprocessing task;
after finishing the pretreatment task, obtaining the plateau angle of the micro fission ionization chamber to be diagnosed after pretreatment;
diagnosing the mini-fission ionization chamber to be diagnosed based on the pretreated plateau slope.
18. The method of claim 17, wherein diagnosing the mini-fission ionization chamber to be diagnosed based on the preprocessed plateau slope comprises:
judging whether the preprocessed plateau slope is in a first plateau slope range or not;
if yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the large plateau inclination or exceeding the standard is that the nuclear characteristics of the failed micro-fission ionization chamber are abnormal due to the fact that trace impurity gas enters the sensitive body, and when the plateau inclination of the micro-fission ionization chamber to be diagnosed is restored to a normal range, the micro-fission ionization chamber to be diagnosed is restored to a usable state.
19. The method of claim 17, wherein diagnosing the mini-fission ionization chamber to be diagnosed based on the preprocessed plateau slope comprises:
judging whether the preprocessed plateau slope is in a second plateau slope range or not;
if yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the miniature fission ionization chamber to be diagnosed is faulty and available, and the miniature fission ionization chamber to be diagnosed is replaced in a preset maintenance period.
20. The method of claim 18, wherein diagnosing the mini-fission ionization chamber to be diagnosed based on the preprocessed plateau slope comprises:
judging whether the preprocessed plateau slope is larger than an upper limit value of the plateau slope or not;
if yes, the diagnosis result of the micro fission ionization chamber to be diagnosed is: the reason for the plateau bias or superscalar is that the mini-fission ionization chamber to be diagnosed is not available.
21. A mini-fission ionization chamber fault diagnosis system, comprising:
the monitoring unit is used for monitoring each micro fission ionization chamber in the same pressurized water reactor nuclear motor unit and judging whether the micro fission ionization chambers generate correction coefficients or plateau slope abnormality or not;
The acquisition unit is used for acquiring the fault type of the micro fission ionization chamber to be diagnosed when the correction coefficient or the plateau inclination abnormality occurs in any micro fission ionization chamber in the same pressurized water reactor nuclear power unit; the miniature fission ionization chamber to be diagnosed is a miniature fission ionization chamber with abnormal correction coefficient or plateau slope;
the first diagnosis unit is used for diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset calibration coefficient diagnosis method when the fault type of the micro fission ionization chamber to be diagnosed is that the calibration coefficient exceeds the standard;
and the second diagnosis unit is used for diagnosing the micro fission ionization chamber to be diagnosed by adopting a preset plateau slope diagnosis method when the fault type of the micro fission ionization chamber to be diagnosed is that the plateau slope is abnormal and is large or exceeds the standard.
CN202211581896.8A 2022-12-09 2022-12-09 Method and system for diagnosing fault of miniature fission ionization chamber Pending CN116344083A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117012420A (en) * 2023-07-18 2023-11-07 中广核工程有限公司 Method for selecting working voltage of miniature fission ionization chamber and control equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117012420A (en) * 2023-07-18 2023-11-07 中广核工程有限公司 Method for selecting working voltage of miniature fission ionization chamber and control equipment
CN117012420B (en) * 2023-07-18 2024-06-07 中广核工程有限公司 Method for selecting working voltage of miniature fission ionization chamber and control equipment

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