CN110580964B - Online monitoring method and system for thermal power improvement margin of nuclear power unit - Google Patents
Online monitoring method and system for thermal power improvement margin of nuclear power unit Download PDFInfo
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Abstract
The invention provides an on-line monitoring method and a monitoring system for thermal power improvement margin of a nuclear power unit, wherein the monitoring method comprises the following steps: establishing a real-time database, collecting real-time data of characteristic parameters related to the output of the unit and storing the real-time data in the real-time database; calculating the difference, the maximum value, the mean value, the sliding average value and the overrun duration of the characteristic parameters according to the real-time database; comparing the real-time data and the calculated value of the characteristic parameter with the corresponding alarm limit value, and judging whether the real-time data and the calculated value of the characteristic parameter exceed the corresponding alarm limit value; if yes, an early warning function is triggered to give an alarm. According to the invention, the real-time data of the characteristic parameters, and the difference, the maximum value, the mean value, the sliding average value and the time-out-of-limit of the characteristic parameters are used as the thermal power control parameters and the change of the thermal power control parameters is tracked in real time, so that the real-time online monitoring of the thermal power improvement margin of the nuclear power unit is realized, the output of the nuclear power unit is improved, and the maximization of the power generation capacity of the power plant is realized on the premise of ensuring the.
Description
Technical Field
The invention relates to the technical field of reactor control and protection, in particular to an on-line monitoring method and system for a thermal power improvement margin of a nuclear power unit.
Background
Due to the particularity of the nuclear power station, once a safety accident occurs, a large loss is caused, and a large influence is caused on a human body and the surrounding environment, so that the requirement on the safety of the nuclear power station is relatively high. The existing DCS (Digital Control System) only sets an overrun alarm for monitoring the thermal power of the unit, has no real-time trend curve for operators to check, cannot determine how much real margin of the thermal power is adjustable, generally adopts a conservative strategy considering the safety of the unit, does not allow the overrun alarm to appear, has low average steady-state thermal power setting, causes the unit not to be fully started, and brings the output loss of the unit for generating power.
On the basis of the prior art, a certain nuclear power plant provides a new monitoring method, which obtains the maximum values of the nuclear power, the thermal power and the loop thermal power in a period of time, compares the maximum values with respective peak value limit values to obtain three corresponding margin values, and obtains a minimum margin value and a preset fixed margin value from the three margin values to obtain a lifting margin. However, compared with the operation technical specification requirement of the unit, the monitoring method has smaller adjustable margin and has an improved space; in addition, the monitoring method carries out data acquisition in a fixed time period, real-time tracking cannot be carried out, operating personnel cannot comprehensively acquire the margin condition of the unit, and each unit does not actually achieve theoretical full-power generation.
Disclosure of Invention
The invention provides an on-line monitoring method for the thermal power improvement margin of a nuclear power unit, aiming at the problem that the existing nuclear power unit cannot realize full power generation of the unit due to the influence of monitoring and control technical defects.
The technical scheme of the invention for solving the technical problems is as follows: on one hand, the on-line monitoring method for the thermal power improvement margin of the nuclear power unit is provided, and comprises the following steps:
establishing a real-time database, collecting real-time data of characteristic parameters related to the output of the unit and storing the real-time data in the real-time database;
calculating the difference, the maximum value, the mean value, the sliding average value and the overrun duration of the characteristic parameters according to the real-time database;
comparing the real-time data and the calculated value of the characteristic parameter with the corresponding alarm limit value, and judging whether the real-time data and the calculated value of the characteristic parameter exceed the corresponding alarm limit value; if yes, an early warning function is triggered to give an alarm.
In the above-mentioned on-line monitoring method of the present invention, the characteristic parameters include thermal power, average temperature and average temperature difference of the loop, nuclear power of the channel, opening of the steam inlet valve, sea water level and temperature.
In the above online monitoring method of the present invention, the calculating of the moving average of the characteristic parameter includes: 8-hour sliding average thermal power, 1-minute sliding average thermal power, 20-minute loop sliding average temperature difference and 20-minute channel nuclear power and thermal power sliding average deviation.
In the above online monitoring method of the present invention, the calculating of the time-out-of-limit of the characteristic parameter includes: the heat power exceeds the accumulated time of 100.5% FP, 101% FP and 102% FP within 8 hours; the maximum value calculation of the characteristic parameters comprises the following steps: a maximum value of the channel core power; the mean value calculation of the characteristic parameters comprises the following steps: a loop maximum average temperature and a loop actual average temperature.
In the above online monitoring method of the present invention, comparing the real-time data and the calculated value of the characteristic parameter with the corresponding alarm limit value, and determining whether the real-time data and the calculated value exceed the corresponding alarm limit value, specifically, the method includes:
judging whether the opening of the steam inlet valve, the sea water level and the temperature exceed corresponding preset limit values, judging whether the real-time data of the thermal power exceeds an early warning value of 101% FP and an alarm value of 102% FP, whether the 8-hour sliding average thermal power exceeds an early warning value of 99.9% FP and an alarm value of 100% FP, whether the 1-minute sliding average thermal power exceeds an upper limit alarm value of 100% FP or is lower than a lower limit alarm value of 99% FP, whether the 20-minute channel nuclear power and thermal power sliding average deviation exceeds 0.5%, whether the 8-hour internal thermal power exceeds the accumulated time of 100.5% FP exceeds 60 minutes, whether the 8-hour internal thermal power exceeds the accumulated time of 101% FP exceeds 30 minutes, and whether the 8-hour internal thermal power exceeds the accumulated time of 102% FP exceeds 1 minute.
The above online monitoring method of the present invention further comprises:
and if the 20-minute channel nuclear power and thermal power sliding average deviation exceeds the corresponding preset limit value, recalibrating the channel nuclear power according to a set time interval.
The above online monitoring method of the present invention further comprises:
judging whether the nuclear power unit is under a non-full-load operation condition; and if so, shielding the early warning function.
The above online monitoring method of the present invention further comprises:
and judging whether the real-time data acquisition of the characteristic parameters is abnormal or not within each time length corresponding to the calculation of the sliding average value of the characteristic parameters, and displaying the judgment result in real time.
On the other hand, still provide an on-line monitoring system of nuclear power unit thermal power promotion margin, include:
the acquisition network is used for acquiring real-time data of characteristic parameters related to the output of the unit in real time;
the real-time database is connected with the acquisition network and is used for storing the real-time data of the characteristic parameters;
the main control terminal is connected with the real-time database and is used for calculating the difference value, the maximum value, the mean value, the sliding average value and the time-out-of-limit of the characteristic parameters according to the real-time database, comparing the real-time data and the calculated value of the characteristic parameters with the corresponding alarm limit value and judging whether the real-time data and the calculated value exceed the corresponding alarm limit value; if yes, an early warning function is triggered to give an alarm.
In the above on-line monitoring system of the present invention, the characteristic parameters include thermal power, average temperature and average temperature difference of the loop, nuclear power of the channel, opening of the steam inlet valve, sea water level and temperature.
The implementation of the on-line monitoring method and the system for the thermal power improvement margin of the nuclear power unit provided by the invention has the following beneficial effects: the online monitoring method and the online monitoring system provided by the invention have the advantages that the characteristic parameters related to the output of the unit are collected in real time, the difference, the maximum value, the mean value, the sliding average value and the time exceeding limit of the characteristic parameters are further calculated to serve as the thermal power control parameters, the early warning function is set to track the change of the thermal power control parameters in real time, the real-time, comprehensive and accurate online monitoring of the thermal power improvement margin of the nuclear power unit is realized, an operator can be timely reminded to monitor and adjust the thermal power control parameter, the output of the unit is improved, and the maximization of the power generation capacity of a power plant is realized.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of an online monitoring method provided by an embodiment of the invention;
fig. 2 is a block diagram of an online monitoring system according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will more clearly understand the present invention, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention provides an on-line monitoring method and system for thermal power improvement margin of a nuclear power unit, aiming at the problems that the thermal power adjustment of the existing nuclear power unit adopts conservative decision, the nuclear power unit is not fully generated, the generated output of the unit is lost and the like, and the core idea is as follows: the method comprises the steps of collecting real-time data of characteristic parameters related to unit output, calculating difference values, maximum values, mean values, sliding average values and time-out-of-limit durations of the characteristic parameters, using the real-time values and the calculated values of the characteristic parameters as control parameters to track changes of the characteristic parameters in real time, reminding an operator of monitoring and adjusting in time through an early warning function, improving the unit output, and expecting the unit thermal power to be improved by 15MW on average every day compared with a monitoring method recorded in the background technology, so that huge economic benefits can be generated.
Fig. 1 is an on-line monitoring method for thermal power increase margin of a nuclear power generating unit shown in this embodiment, and as shown in fig. 1, the monitoring method includes the steps of:
s1, establishing a real-time database, collecting real-time data of characteristic parameters related to the output of the unit and storing the real-time data in the real-time database;
s2, calculating the difference, the maximum value, the mean value, the sliding mean value and the time-out-of-limit duration of the characteristic parameters according to the real-time database;
s3, comparing the real-time data and the calculated value of the characteristic parameter with the corresponding alarm limit value, and judging whether the real-time data and the calculated value exceed the corresponding alarm limit value; if yes, an early warning function is triggered to give an alarm.
In this embodiment, the moving average is obtained by sequentially increasing or decreasing new and old data one by one based on a simple average method, so that accidental variation factors can be eliminated and the accuracy of the data can be improved.
Specifically, the characteristic parameters related to the unit output comprise thermal power, the average temperature and the average temperature difference of a loop, channel nuclear power, the opening degree of an air inlet valve, seawater tide level and temperature.
In this embodiment, the nuclear power plant includes three loops, and the arithmetic mean of the inlet water temperature and the outlet water temperature of each loop is the loop mean temperature of that loop.
In the embodiment, the opening of the steam inlet valve is the arithmetic average of the three openings of the steam inlet valve of the steam turbine; it should be noted that when the seawater temperature and the seawater level change, the unit efficiency changes, the thermal power fluctuation under the set electric power is large, and if the electric power set value is not adjusted in time, the total thermal power control limit value is too low; whether the opening of the steam inlet valve of the steam turbine is limited or not also restricts the full generation of the heat power of a primary circuit, along with the continuous operation of the evaporator, the performance of the evaporator is reduced, the steam inlet valve is continuously opened, and the change needs to be monitored in time. The embodiment realizes the important power generation limited parameters of the unit: the centralized monitoring of sea water temperature, sea water tide level and admission valve aperture can remind the operating personnel in time to trail the influence of water temperature, tide level to unit efficiency, is convenient for the operation and adjusts the thermal power and makes the reference, and then adjusts a return circuit electric power to guarantee that the thermal power of whole day operates at higher level.
Further, the calculation of the running average of the characteristic parameters in the step S2 over the preset time period includes: 8-hour sliding average thermal power, 1-minute sliding average thermal power, 20-minute loop sliding average temperature difference, and 20-minute channel nuclear power and thermal power sliding average deviation;
in this embodiment, the average temperature difference of the primary loop is the deviation between the standard temperature obtained by power conversion and the actual average temperature of the primary loop, which is also called the supercooling degree, and the supercooled state of the reactor core can be monitored and alarmed by performing real-time statistics on the sliding average temperature difference of the primary loop and setting an overrun alarm, so that the temperature of the primary loop is maintained in a safe operation interval.
The calculation of the overrun duration of the characteristic parameter in the preset time span comprises the following steps: the heat power exceeds the accumulated time of 100.5% FP, 101% FP and 102% FP within 8 hours; the calculation of the maximum value of the characteristic parameter within the preset time length comprises the following steps: a maximum value of the channel core power; the mean value calculation of the characteristic parameters comprises the following steps: a loop maximum average temperature and a loop actual average temperature.
In this embodiment, the maximum value of the channel core power is the maximum value of the channel core power of the four partitions, the maximum channel core power is obtained by comparing the four channel core powers, and similarly, the 20-minute channel core power and the thermal power sliding average deviation have four values and respectively correspond to the four partitions of the unit; on one hand, the implementation sets an overrun alarm for the maximum value of the channel nuclear power, and the overrun alarm is used for locking the lifting of a control rod after the alarm is given out, and the overrun alarm value can be determined according to the relevant operation technical specifications; on the other hand, the deviation of the channel nuclear power and the thermal power is subjected to 20-minute sliding average deviation statistics and an alarm limit value is set to remind that the related channel nuclear power is recalibrated, so that the influence of the reactor core fuel consumption on the unit output is eliminated in time, and the use efficiency of the reactor core heat is improved; the maximum average temperature of the loop is the maximum value of the average temperatures of the three loops, and the actual average temperature of the loop is the arithmetic average of the average temperatures of the three loops.
It should be noted that the 20-minute channel core power and thermal efficiency moving average deviation also includes the difference calculation of the characteristic parameters, and is not described herein again.
Further, in step S3, comparing the real-time data and the calculated value of the characteristic parameter with the corresponding alarm limit value, and determining whether the real-time data and the calculated value exceed the corresponding alarm limit value, specifically including:
judging whether the opening of the steam inlet valve, the sea water level and the temperature exceed corresponding preset limit values, judging whether the real-time data of the thermal power exceeds an early warning value of 101% FP and an alarm value of 102% FP, whether the 8-hour sliding average thermal power exceeds an early warning value of 99.9% FP and an alarm value of 100% FP, whether the 1-minute sliding average thermal power exceeds an upper limit alarm value of 100% FP or is lower than a lower limit alarm value of 99% FP, whether the deviation between the 20-minute channel nuclear power and the thermal engineering sliding average exceeds 0.5%, whether the accumulated time of the 8-hour internal thermal power exceeding 100.5% FP exceeds 60 minutes, whether the accumulated time of the 8-hour internal thermal power exceeding 101% FP exceeds 30 minutes, and whether the accumulated time of the 8-hour internal thermal power exceeding 102% FP exceeds 1 minute.
In the embodiment, the real-time thermal power is monitored by setting an overrun alarm value of 101% FP and an overrun alarm value of 102% FP; the 8-hour sliding average thermal power is monitored through an overrun early warning value of 99.9% FP and an overrun warning value of 100% FP; the average thermal power is set to be an upper limit alarm value of 100% FP and a lower limit alarm value of 99% FP for monitoring within 1 minute, and alarm is carried out when the average thermal power exceeds the range, so that the output of the unit is reasonable and as high as possible;
it should be noted that the invention obtains the real-time thermal power, the 8-hour internal thermal power overrun timer, the 8-hour sliding average thermal power, the 1-minute sliding average thermal power and the specific limited range of the channel nuclear power and the thermal power sliding average deviation according to a large amount of test data, is creatively obtained by the invention, not only can meet the relevant operation technical specification of the unit safety requirement, but also can improve the unit power generation output, and the expected unit thermal power is improved by 15MW on average compared with the monitoring method mentioned in the background technology, so that the invention has great economic benefit. Of course, a person skilled in the art may also set different warning values and warning values according to different nuclear power generating unit systems and different unit operation technical specifications, which are not described herein again.
In this embodiment, the online monitoring method further includes the steps of:
s4, performing parameter display, trend display and graphical statistics on the real-time data and the calculated values of the characteristic parameters, and reminding an operator to adjust the opening of the steam inlet valve, recalibrate the nuclear power of the channel and other related operations;
in the embodiment, the parameter display comprises real-time thermal power, channel nuclear power, the maximum average temperature of a loop, the actual average temperature of the loop, the opening of an intake valve and real-time value display of the sliding average deviation of the nuclear power and the thermal power of four channels; the trend display comprises trend graph display of sliding average thermal power in 8 hours and 1 minute, trend graph display of channel maximum nuclear power, trend graph display of circuit sliding average temperature difference in 20 minutes, trend display of seawater temperature change in the last 24 hours and trend display of seawater tide level change in the last 24 hours; the graphical statistics comprises graphical statistical display of the heat power of 8 hours more than 100.5% FP cumulative time, the heat power of 8 hours more than 101% cumulative time, the heat power of 8 hours more than 102% FP cumulative time, the loop sliding average temperature difference of 20 minutes, the sliding average heat power of 8 hours and 1 minute, the maximum nuclear power of a channel, and the sliding average deviation of the nuclear power and the heat power of four channels in 20 minutes. Of course, a person skilled in the art may select a specific screen display mode according to needs to facilitate monitoring by an operator, and the embodiment is not particularly limited.
Further, the monitoring method further comprises the steps of:
and S5, if the 20-minute channel core power and thermal power moving average deviation exceeds the corresponding preset limit value, recalibrating the channel core power according to a set time interval.
In the present embodiment, the time interval is set once every 7 days; the nuclear power is calibrated by thermal power, and as the fuel consumption increases, the deviation between the two increases, and the nuclear power needs to be adjusted periodically. The channel nuclear power is recalibrated when the moving average deviation of the channel nuclear power and the thermal power exceeds 0.5% in 20 minutes, and the influence of the reactor core burnup on the generating output of the unit can be eliminated in time by comparing the nuclear power with the thermal power.
Further, the monitoring method further comprises the steps of:
s6, judging whether the nuclear power unit is under the non-full-load operation condition; and if so, shielding the early warning function.
In the embodiment, the early warning function comprises a popup alarm and a sound alarm, and the alarm content comprises a pre-recorded over-limit item reminding voice and a response suggestion, so that an operator can timely master the thermal power operation condition of the unit and make adjustment according to the margin; and the steps realize the automatic judgment and shielding alarm function under the non-full-load operation condition, so that the conventional operation monitoring and operation of an operator are not in conflict, and the safety operation requirement of the nuclear power unit is met. In other embodiments of the invention, the pre-warning function may be masked while only the sound alarm is masked and the pop-up alarm is retained; of course, the operator may manually override the alarm function.
Further, the monitoring method further comprises the steps of:
and S7, judging whether the real-time data acquisition of the characteristic parameters is abnormal or not within each time length corresponding to the calculation of the sliding average value of the characteristic parameters, and displaying the judgment result in real time.
In the embodiment, three alarm indicator lamps are arranged to respectively indicate whether data acquisition abnormity occurs within 1 minute, 20 minutes and 8 hours. In the actual acquisition process, the acquired real-time data is provided with a marker bit GOOD and a TIMEOUT, when the marker bit GOOD is detected, the data acquisition is judged to be normal, three alarm indicator lamps display green, and the data represent that the data are credible in 1 minute, 20 minutes and 8 hours; when the flag bit TIMEOUT is detected, the occurrence of data acquisition abnormity is judged, all the three alarm indicating lamps display red, the data are not credible within 1 minute, 20 minutes and 8 hours, and related personnel can immediately carry out maintenance treatment; when the recovery of the GOOD mark position is detected, timing is started, and after the timing reaches 1 minute, one of the alarm indicator lamps which represents 1 minute of available data displays green; when the time reaches 20 minutes, the other alarm indicator lamp which represents the availability of 20-minute data displays green, and so on, thereby clearly informing an operator whether the calculated value data such as the moving average power, the moving average temperature difference of the primary circuit and the like in each time span are available or not, and preventing misjudgment.
Fig. 2 is a schematic structural diagram of an on-line monitoring system for thermal power increase margin of a nuclear power generating unit according to this embodiment, as shown in fig. 2, the monitoring system includes an acquisition network 10, a real-time database 20 and a main control terminal 30, and the acquisition network 10 is configured to acquire real-time data of characteristic parameters related to output of the nuclear power generating unit in real time; the real-time database 20 is connected with the acquisition network 10 and is used for storing the real-time data of the characteristic parameters; the main control terminal 30 is connected with the real-time database 20, and is used for calculating the difference, the maximum, the mean, the sliding average and the time-out-of-limit of the characteristic parameters according to the real-time database, comparing the real-time data and the calculated value of the characteristic parameters with the corresponding alarm limit value, and judging whether the real-time data and the calculated value exceed the corresponding alarm limit value; if yes, an early warning function is triggered to give an alarm.
Specifically, the characteristic parameters comprise thermal power, loop average temperature and average temperature difference, channel nuclear power, opening of an air inlet valve, sea water tide level and temperature.
In this embodiment, the online monitoring system collects characteristic parameters related to the output of the unit in real time and stores the characteristic parameters in a real-time database, and as a result of hardware, a collection network and a real-time database server are established. The system is established on the basis of a real-time data acquisition and storage technology, supports nuclear power unit operators by acquiring characteristic parameter real-time data and further adopting background calculation, statistics and comprehensive alarm technologies, controls the thermal power as high as possible and improves the output of the unit.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, other implementation details of the online monitoring system may be implemented by referring to the corresponding implementation process provided in the online monitoring method, and details of this embodiment are not described herein again.
In summary, the invention provides an online monitoring method and system for thermal power increase margin of a nuclear power unit, which are used for acquiring characteristic parameters related to the output of the unit in real time, calculating the difference, the maximum value, the mean value, the sliding average value and the time exceeding limit of the characteristic parameters as thermal power control parameters, and setting an alarm function to track the change of the characteristic parameters in real time, so that the real-time online monitoring of the thermal power increase margin of the nuclear power unit is realized, an operator can be reminded to monitor and adjust in time, the output of the unit is increased, and the maximization of the power generation capacity of a power plant is realized on the premise of ensuring the safe operation of the unit.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (7)
1. An on-line monitoring method for thermal power improvement margin of a nuclear power unit is characterized by comprising the following steps:
establishing a real-time database, collecting real-time data of characteristic parameters related to the output of the unit and storing the real-time data in the real-time database;
calculating the difference, the maximum value, the mean value, the sliding average value and the overrun duration of the characteristic parameters according to the real-time database;
comparing the real-time data and the calculated value of the characteristic parameter with the corresponding alarm limit value, and judging whether the real-time data and the calculated value of the characteristic parameter exceed the corresponding alarm limit value; if yes, triggering an early warning function to give an alarm;
the characteristic parameters comprise thermal power, loop average temperature and average temperature difference, channel nuclear power, opening degree of an air inlet valve, sea water tide level and temperature;
the calculation of the moving average of the characteristic parameter comprises: 8-hour sliding average thermal power, 1-minute sliding average thermal power, 20-minute loop sliding average temperature difference, and 20-minute channel nuclear power and thermal power sliding average deviation;
the calculation of the time-out-of-limit of the characteristic parameters comprises the following steps: the heat power exceeds the accumulated time of 100.5% FP, 101% FP and 102% FP within 8 hours; the maximum value calculation of the characteristic parameters comprises the following steps: a maximum value of the channel core power; the mean value calculation of the characteristic parameters comprises the following steps: a loop maximum average temperature and a loop actual average temperature.
2. The on-line monitoring method according to claim 1, wherein comparing the real-time data and the calculated value of the characteristic parameter with the corresponding alarm limit value to determine whether the real-time data and the calculated value exceed the corresponding alarm limit value specifically comprises:
judging whether the opening of the steam inlet valve, the sea water level and the temperature exceed corresponding preset limit values, judging whether the real-time data of the thermal power exceeds an early warning value of 101% FP and an alarm value of 102% FP, whether the 8-hour sliding average thermal power exceeds an early warning value of 99.9% FP and an alarm value of 100% FP, whether the 1-minute sliding average thermal power exceeds an upper limit alarm value of 100% FP or is lower than a lower limit alarm value of 99% FP, whether the 20-minute channel nuclear power and thermal power sliding average deviation exceeds 0.5%, whether the 8-hour internal thermal power exceeds the accumulated time of 100.5% FP exceeds 60 minutes, whether the 8-hour internal thermal power exceeds the accumulated time of 101% FP exceeds 30 minutes, and whether the 8-hour internal thermal power exceeds the accumulated time of 102% FP exceeds 1 minute.
3. The on-line monitoring method of claim 1, further comprising:
and if the 20-minute channel nuclear power and thermal power sliding average deviation exceeds the corresponding preset limit value, recalibrating the channel nuclear power according to a set time interval.
4. The on-line monitoring method of claim 1, further comprising:
judging whether the nuclear power unit is under a non-full-load operation condition; and if so, shielding the early warning function.
5. The on-line monitoring method of claim 1, further comprising:
and judging whether the real-time data acquisition of the characteristic parameters is abnormal or not within each time length corresponding to the calculation of the sliding average value of the characteristic parameters, and displaying the judgment result in real time.
6. The on-line monitoring system for the thermal power improvement margin of the nuclear power unit is applied to the method of claim 1, and is characterized by comprising the following steps of:
the acquisition network is used for acquiring real-time data of characteristic parameters related to the output of the unit in real time;
the real-time database is connected with the acquisition network and is used for storing the real-time data of the characteristic parameters;
the main control terminal is connected with the real-time database and is used for calculating the difference value, the maximum value, the mean value, the sliding average value and the time-out-of-limit of the characteristic parameters according to the real-time database, comparing the real-time data and the calculated value of the characteristic parameters with the corresponding alarm limit value and judging whether the real-time data and the calculated value exceed the corresponding alarm limit value; if yes, an early warning function is triggered to give an alarm.
7. The on-line monitoring system of claim 6, wherein the characteristic parameters include thermal power, loop average temperature and average temperature difference, channel nuclear power, inlet valve opening, sea water tide level and temperature.
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