CN110828011B - Nuclear power plant pipeline thermal fatigue monitoring system - Google Patents
Nuclear power plant pipeline thermal fatigue monitoring system Download PDFInfo
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- CN110828011B CN110828011B CN201911065122.8A CN201911065122A CN110828011B CN 110828011 B CN110828011 B CN 110828011B CN 201911065122 A CN201911065122 A CN 201911065122A CN 110828011 B CN110828011 B CN 110828011B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/017—Inspection or maintenance of pipe-lines or tubes in nuclear installations
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C17/112—Measuring temperature
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- 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 discloses a thermal fatigue monitoring system for a nuclear power plant pipeline, which comprises a fatigue monitoring sensor assembly, a data acquisition unit, a photoelectric conversion unit and a monitoring and analyzing and evaluating unit, wherein the fatigue monitoring sensor assembly is arranged on a loop pipeline in a containment vessel; the fatigue monitoring sensor assembly comprises a thermocouple, a metal braided hose sleeved on part of the thermocouple, a mounting bracket for mounting the thermocouple on a pipeline and a sliding block for fixing the thermocouple on the mounting bracket; the data acquisition unit comprises an environmental sensor and is used for receiving analog signals measured by the fatigue monitoring sensor assembly and the environmental sensor, converting the analog signals into digital signals and outputting the digital signals; the photoelectric conversion unit is used for receiving the digital signal, converting the digital signal into an optical signal and transmitting the optical signal to the monitoring and analyzing and evaluating unit; the monitoring and analyzing and evaluating unit is used for receiving the optical signal and carrying out monitoring and analyzing and evaluating of thermal fatigue.
Description
Technical Field
The invention belongs to the technical field of thermal fatigue monitoring of pipelines of nuclear power plants, and particularly relates to a thermal fatigue monitoring system suitable for an auxiliary pipeline of a primary circuit of an in-service nuclear power plant.
Background
Thermal fatigue is an important mechanism causing the crack of a primary loop pipeline of a nuclear power plant, and the mechanism is not completely considered in the initial design reference transient state, which brings great hidden trouble to the long-term safe operation of the nuclear power plant. With the continuous occurrence of a loop pipeline thermal fatigue event, the foreign nuclear power supervision organization gives enough attention in this respect: thermal fatigue monitoring and evaluation have been written into nuclear safety regulations in european countries such as germany, the NRC in the united states requires monitoring and evaluation of thermal fatigue damage by installing monitoring instruments in each nuclear power plant, and the nuclear safety agency in the country of china also proposes that attention must be paid to the thermal fatigue problem of the primary loop pipeline and requires effective management of the nuclear power plant. Therefore, the thermal fatigue monitoring technology is researched and developed aiming at the nuclear power plant pipeline, and the method has important significance for predicting and preventing the occurrence of thermal fatigue events.
In the existing mode, an original design sensor of a nuclear power plant is generally used for monitoring a transient state occurring in a primary loop pipeline, and a fatigue accumulation use factor is calculated by combining the maximum allowable transient occurrence number so as to evaluate the fatigue state of the primary loop pipeline. Since these sensors were not designed for monitoring thermal fatigue of the pipeline at the beginning, there are some obvious disadvantages in this way: (1) the positions of measuring points are few, no pertinence exists, and the thermal fatigue sensitive pipe sections and the positions cannot be covered; (2) the sensor is single-point type, and the thermal fatigue phenomena such as thermal stratification, thermal shock and the like cannot be monitored; (3) the amount of collected data is small, and detailed analysis and evaluation of fatigue are difficult to support.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art, the present invention aims to provide a thermal fatigue monitoring system which can be applied to an auxiliary pipeline of a primary loop of an in-service nuclear power plant.
In order to achieve the purpose, the invention adopts the following technical scheme:
a thermal fatigue monitoring system for a nuclear power plant pipeline comprises a fatigue monitoring sensor assembly, a data acquisition unit, a photoelectric conversion unit and a monitoring and analyzing and evaluating unit, wherein the fatigue monitoring sensor assembly is arranged on a loop pipeline in a containment vessel; the fatigue monitoring sensor assembly comprises a thermocouple, a metal braided hose sleeved on part of the thermocouple, a mounting bracket for mounting the thermocouple on a pipeline and a sliding block for fixing the thermocouple on the mounting bracket; the data acquisition unit comprises an environmental sensor and is used for receiving analog signals measured by the fatigue monitoring sensor assembly and the environmental sensor, converting the analog signals into digital signals and outputting the digital signals; the photoelectric conversion unit is used for receiving the digital signal, converting the digital signal into an optical signal and transmitting the optical signal to the monitoring and analyzing and evaluating unit; the monitoring and analyzing and evaluating unit is used for receiving the optical signal and carrying out monitoring and analyzing and evaluating of thermal fatigue.
Preferably, the mounting bracket comprises a short connecting pipe connected with one end of the metal braided hose, a steel belt connected with the short connecting pipe and a connecting buckle connected with two ends of the steel belt, wherein a through groove for accommodating the thermocouple is formed in the steel belt, and the extending direction of the through groove is the same as the extending direction of the steel belt.
More preferably, the thermal expansion coefficient of the steel strip is the same as that of the pipe to be measured.
More preferably, the slider includes slider and apron down, be formed with the confession between slider and the apron down the arc wall that the thermocouple passed, offer on the slider down and be used for supplying the rectangle through-hole that the steel band runs through and supply the circular through-hole that the probe of thermocouple ran through, circular through-hole edge the direction of height of slider down runs through, the extending direction of circular through-hole is perpendicular with the extending direction of rectangle through-hole.
Further preferably, threaded holes are correspondingly formed in the lower sliding block and the cover plate, and the threaded holes extend downwards to the rectangular through holes.
Preferably, the positive and negative electrode conductors of the compensation cable are made of the same material as the thermocouple, and the non-metal part of the compensation cable can resist the accumulated irradiation dose of at least 250 kGy.
Preferably, the data acquisition unit comprises a metal shell, and a data acquisition module, a power module, a network module, a storage module, the environmental sensor and a first power carrier module which are arranged in the metal shell.
More preferably, after analog signals measured by the fatigue monitoring sensor assembly and the environmental sensor are converted into digital signals, the first power carrier module is configured to load the digital signals on alternating current and output the digital signals by an electrical penetration assembly.
Preferably, a second power carrier module for analyzing the signal loaded on the alternating current into a digital signal again and a photoelectric conversion module for converting the digital signal into an optical signal are arranged inside the transmitting end of the photoelectric conversion unit; the receiving end is used for converting the optical signal into a digital signal and transmitting the digital signal to the monitoring and analyzing and evaluating unit.
Preferably, the monitoring, analyzing and evaluating unit includes a disk array, a server, a display and a switch, the disk array is used for storing and physically redundantly backing up the collected data, the server is used for running thermal fatigue monitoring and thermal fatigue analyzing and evaluating software, and the display is used for displaying the result.
Compared with the prior art, the invention has the advantages that: the nuclear power plant pipeline thermal fatigue monitoring system measures temperature gradient data of fluid in a pipeline by mounting a fatigue monitoring sensor assembly on a loop pipeline, and the measured data is subjected to analog-to-digital conversion by a data acquisition unit, is transmitted to a photoelectric conversion unit and is subjected to photoelectric conversion, and then is provided for a monitoring and analysis evaluation unit to store and dynamically monitor.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall structure of a thermal fatigue monitoring system for a nuclear power plant pipeline according to a preferred embodiment of the invention;
FIG. 2 is a schematic representation of the form of the sensor assembly for different measurement purposes in a preferred embodiment of the invention;
FIG. 3 is a schematic structural view of a fatigue monitoring sensor assembly in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic view of a slider structure in a preferred embodiment of the present invention;
FIG. 5 is a front view of a mounting bracket in accordance with a preferred embodiment of the present invention;
FIG. 6 is a schematic illustration of the structure of a steel strip in a preferred embodiment of the invention;
FIG. 7 is a schematic diagram of the internal structure of a data acquisition unit in a preferred embodiment of the present invention;
FIG. 8 is a schematic diagram of the network connections within the data acquisition unit in the preferred embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a photoelectric conversion unit according to a preferred embodiment of the present invention;
FIG. 10 is a schematic diagram of a monitoring and evaluation unit in accordance with a preferred embodiment of the present invention;
FIG. 11 illustrates a thermal fatigue monitoring and thermal fatigue analysis and evaluation software architecture according to a preferred embodiment of the present invention;
wherein: the fatigue monitoring sensor comprises a fatigue monitoring sensor component-1, a thermocouple-11, a sliding block-12, a lower sliding block-121, a rectangular through hole-1211, a circular through hole-1212, an arc-shaped groove-1213, a cover plate-122, a threaded hole-123, a metal braided hose-13, a nut-131, a mounting bracket-14, a connecting short pipe-141, a thread-1411, a steel belt-142, a through groove-1421, a connecting buckle-143, a data acquisition unit-2, a metal shell-21, a data acquisition module-22, a power supply module-23, a network module-24, a storage module-25, an environmental sensor-26, a first power carrier module-27, a photoelectric conversion unit-3, a transmitting end-31, a receiving end-32 and an optical fiber transceiver-33, the system comprises an optical fiber fusion box-34, a monitoring and analyzing evaluation unit-4, a disk array-41, a server-42, a display-43, a switch-44, a compensation cable-5, a network cable-6 and an optical cable-7.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the thermal fatigue monitoring system for the nuclear power plant pipeline of the embodiment includes a fatigue monitoring sensor assembly 1, a data acquisition unit 2, a photoelectric conversion unit 3 and a monitoring and analyzing and evaluating unit 4, the fatigue monitoring sensor assembly 1 is connected with the data acquisition unit 2 through a compensation cable 5, the data acquisition unit 2 is connected with the photoelectric conversion unit 3 through an electrical penetration piece, the photoelectric conversion unit 3 includes a transmitting end 31 and a receiving end 32, the transmitting end 31 is connected with the receiving end 32 through an optical cable 7, and the photoelectric conversion unit 3 is connected with the monitoring and evaluating unit through a network cable 6.
The fatigue monitoring sensor assembly 1 is arranged on a thermal fatigue sensitive point of a loop auxiliary pipeline in a containment and used for monitoring the temperature gradient distribution of the pipeline in the radial circumferential direction; the data acquisition unit 2 is arranged in the inner and outer annular corridor low-irradiation area of the containment and is used for receiving analog signals measured by the fatigue monitoring sensor assembly 1 and the environmental sensor 26 in the data acquisition unit 2 and converting the analog signals into digital signals, and the digital signals are loaded on alternating current through a power carrier technology and output by the electric penetration piece; the photoelectric conversion unit 3 is arranged outside the containment vessel and used for analyzing temperature data loaded on alternating current and converting received digital signals into optical signals, so that long-distance transmission is realized, and high-speed and reliable communication between equipment inside and outside the containment vessel is ensured; the monitoring and analyzing and evaluating unit 4 is installed in the control room, is composed of a server 42, a disk array 41, a switch 44 and a monitor, is used for receiving signals, calculating and the like, can realize online monitoring and storage of system states and fatigue data, and can lead the data into a fatigue analyzing and evaluating module to evaluate the fatigue damage of the pipeline.
As shown in fig. 1 to 11, the fatigue monitoring sensor assembly 1, the data acquisition unit 2, the photoelectric conversion unit 3, and the monitoring and analysis evaluation unit 4 in the present embodiment have the following specific structures:
1. fatigue monitoring sensor assembly 1
As shown in fig. 2 to 6, the fatigue monitoring sensor assembly 1 includes an N-type sheathed thermocouple 11, a metal braided hose 13 fitted over a portion of the thermocouple 11, a mounting bracket 14 for mounting the thermocouple 11 on a pipe, and a slider 12 for fixing the thermocouple 11 to the mounting bracket 14.
Wherein, N type armoured thermocouple 11 comprises measuring probe, extension line and aviation connecting piece. The measuring probe is an N-type thermocouple 11 wrapped by an INCONEL600 material, the material of the thermocouple is nickel chromium-nickel silicon, MgO insulation is filled in the thermocouple, the accuracy of the probe can reach level 1, and the thermocouple can run in a high-temperature (400 ℃) high-irradiation (accumulated dose is 250kGy) environment for a long time; the conductor materials in the extension line and the aviation connecting piece are consistent with those of the coupling material in the probe, and the insulating layer is PEEK (polyether ether ketone), so that the extension line and the aviation connecting piece have good irradiation resistance and aging resistance.
The metal braided hose 13 includes a fitting nut 131 and a metal tube portion, and the nut 131 is used for connecting with the mounting bracket 14, and plays a role in guiding and protecting the thermocouple 11. The metal braided hose 13 is made of stainless steel and can meet the application conditions of high temperature and high radiation on site. Because metal woven hose 13 has better flexibility, consequently, can adapt to the stress that operating mode such as heat preservation dislocation a little, heat preservation hole slope produced, can form good protection to thermocouple 11 that passes wherein simultaneously.
As shown in fig. 5-6, the mounting bracket 14 includes a connection stub 141, a stainless steel band 142, and an adjustable quick connector 143. The connection stub 141 has a threaded upper end 1411 (for connecting with the matching nut 131 of the metal braided hose 13) and a notch (for passing through the thermocouple 11) on the side surface. The connecting short pipe 141 is welded on the stainless steel strip 142 in a surfacing mode, the stainless steel strip 142 is of a thin-sheet structure with a through groove 1421 in the middle, the through groove 1421 is used for penetrating the thermocouple 11, and the whole stainless steel strip 142 can be installed on a loop pipeline of a nuclear power plant in an encircling mode and is fixed and tightness-adjustable through an adjustable quick connector 143.
Fig. 4 shows a front view of the slide 12 in fig. 4a, a top view of the slide 12 in fig. 4b, and a side view of the slide 12 in fig. 4 c. The slider 12 comprises a lower slider 121 for passing through the stainless steel band 142 and the thermocouple 11 and a cover plate 122 for fixing the thermocouple 11 in cooperation with the lower slider 121. The lower slider 121 is provided with a rectangular through hole 1211 for allowing the stainless steel strip 142 to penetrate, a circular through hole 1212 penetrating the height of the lower slider 121 is formed in the middle of the lower slider 121 for inserting the probe of the N-type armored thermocouple 11, and the rectangular through hole 1211 and the circular through hole 1212 are vertically arranged. The lower slider 121 and the cover plate 122 are provided with arc grooves 1213, the two arc grooves 1213 are combined to form a circular groove, and the rear end of the probe is led out through the circular groove and is pressed and fixed by the cover plate 122. In this embodiment, the cover plate 122 and the lower slider 121 are both provided with a corresponding threaded hole 123, the threaded hole 123 extends to the rectangular through hole 1211, and the bolt on the cover plate 122 can be pushed to the rectangular through hole 1211 to realize the relative fixation between the slider 12 and the stainless steel band 142. By such design, the number of thermocouples 11 and sliders 12 can be flexibly increased on the steel belt 142, and the measurement position can be freely adjusted, thereby realizing intensification.
The material of the positive and negative electrode conductors of the compensation cable 5 in the embodiment is consistent with that of the thermocouple 11, and the non-metal parts such as the insulating sheath of the compensation cable 5 are low-smoke halogen-free flame-retardant materials, have the tolerance capability of the accumulated irradiation dose of more than 250kGy, and can operate in a high irradiation area in the containment vessel of a nuclear power plant for a long time.
The sensor assembly in the embodiment has good linearity, high precision and stability, and can realize long-term accurate monitoring of the radial circumferential temperature distribution of the pipeline under the high-irradiation environment on the premise of not damaging the structural integrity of the loop pipeline. In addition, the sensor assembly in this embodiment can flexibly set different numbers and angles of thermocouples 11 according to different thermal fatigue mechanisms, as shown in fig. 2, and can monitor thermal stratification (2a), turbulent penetration (2b), thermal shock (2c), and the like in a targeted manner. In fig. 2, when detecting thermal stratification, 7 thermocouple 11 probes are distributed on the pipe to be detected, and the included angle between each probe is 30 ° as seen from the cross section, as shown in fig. 2 a; when detecting turbulent flow infiltration, 4 thermocouples 11 probes are distributed on the pipeline to be detected, and the included angle between every two probes is 90 degrees when viewed from the section, as shown in fig. 2 b; when detecting thermal stratification, 2 thermocouples 11 are distributed on the pipeline to be detected, and the included angle between each probe is 180 degrees as shown in fig. 2c when viewed from the section.
In order to ensure that the measuring part of the sensor component can be tightly attached to the wall of the pipeline all the time when the pipeline expands with heat and contracts with cold and prevent the pipe from being broken, the material selected and used by the steel strip 142 attached to the pipeline in the sensor component is kept consistent with the material of the pipeline, so that the same thermal expansion coefficient is ensured.
2. Data acquisition unit 2
As shown in fig. 7, the data acquisition unit 2 has a strong mechanical strength and has good electromagnetic shielding performance and gamma ray shielding performance by using a lead core stainless steel metal shell 21, so that the internal module can be effectively protected. A data acquisition module 22, a power supply module 23, a network module 24, an on-site storage module 25, an on-site environment sensor 26 and a first power carrier module 27 are integrated in the shell. The network connection among the internal modules of the data acquisition unit 2 is an enhanced ring network, and when a single-node fault exists in the network, the network can still normally communicate, so that the robustness of the network is ensured.
The data acquisition modules 22 adopt an auto-negotiation mechanism, and can automatically switch to a standby module after a single module fails, so that uninterrupted data acquisition is realized; the power module 23 adopts a 1:1 redundancy design, and can realize automatic switching under the condition of single-path fault; the local storage module 25 is used for storing the thermal fatigue monitoring data locally when the data acquisition unit 2 loses communication with the equipment outside the containment vessel and data transmission cannot be carried out, and the storage time is longer than 18 months, so that the data security is guaranteed; the in-situ environment monitoring sensor is arranged in the shell of the data acquisition unit 2 and used for monitoring the internal temperature and irradiation parameters of the equipment, so that the remote internal environment monitoring of the in-situ acquisition unit can be realized, and when the equipment breaks down, the fault analysis can be assisted; the first power carrier module 27 is used for loading the digital signal on the alternating current through the power carrier technology and outputting the digital signal through the electrical penetration piece, so that the defects of narrow transmission bandwidth, low reliability and poor anti-interference capability of the electrical penetration piece for Ethernet communication are overcome. Fig. 8 is a schematic diagram of network connection inside the data acquisition unit 2. The data acquisition module 22 is composed of a plurality of sub-modules, the sub-modules are independent from each other and communicate through a bus, the data acquisition modules and the switch are connected in series through network cables to form a ring network mechanism, and when a single-node fault exists in the network, the network can still normally communicate; the local acquisition module is independently connected to the switch through a network cable, so that local storage is realized when the communication with the equipment outside the containment vessel is lost; the switch is connected with the power carrier unit through a network cable, and the power carrier unit loads the data signals on the alternating current to realize reliable transmission of data inside and outside the containment.
3. Photoelectric conversion unit 3
As shown in fig. 9, the photoelectric conversion unit 3 includes a transmitting end 31 (fig. 9a) and a receiving end 32 (fig. 9b) which are connected by the optical cable 7. The transmitting end 31 and the receiving end 32 each include an optical fiber transceiver 33 and an optical fiber fusion splice cassette 34. The transmitting terminal 31 is installed outside the containment vessel, a second power carrier module is arranged in the containment vessel, temperature data loaded on alternating current can be analyzed into digital signals again, and the digital signals are converted into optical signals through the photoelectric conversion module, so that long-distance transmission is realized; the receiver 32 is installed in the control room, and can convert the optical signal into a digital signal again, and transmit the digital signal to the monitoring and analyzing unit 4.
4. Monitoring and evaluation unit 4
As shown in fig. 10, the monitoring and evaluation unit includes a disk array 41, a server 42, a display 43, and a switch 44. The disk array 41 can realize storage and physical redundancy backup of acquired data; server 42 performs calculations and runs thermal fatigue monitoring and thermal fatigue analysis evaluation software, and monitors and operates via display 43. The thermal fatigue monitoring function comprises the following steps of realizing three-dimensional dynamic monitoring on the pipeline fatigue monitoring state on one hand, and realizing database entry and reading of collected data on the other hand; the fatigue analysis and evaluation function can call data in the database to analyze and evaluate the fatigue state of the pipeline. The thermal fatigue monitoring and thermal fatigue analysis and evaluation software architecture is shown in fig. 11, and the functions of the modules of the thermal fatigue monitoring and thermal fatigue analysis and evaluation software are described as follows:
a thermal fatigue monitoring module:
(1) the main monitoring module comprises a window switching button, a real-time alarm information bar and a main monitoring interface. The specific positions and the running states of all fatigue monitoring sensor components on a loop pipeline are monitored in real time in a three-dimensional model mode, the types of the fatigue monitoring sensors and temperature gradient data for implementing measurement are displayed, and a temperature fluctuation curve is drawn.
(2) Thermal fatigue data dynamic monitoring module: the method is in a list form, and the measurement data, the state, the functional position and the like of the temperature sensor are displayed in real time;
(3) fatigue data query and derivation module: the snapshot data and the interpolation data measured by the fatigue monitoring sensor assembly can be inquired and derived for fatigue analysis and evaluation.
(4) A system fault diagnosis module: the system state can be monitored on line, when a certain device (such as a module) in the system breaks down, the system can automatically alarm, display the specific position of the broken-down module and preliminarily give out a failure analysis result.
(5) The alarm information display and recording module: the generated abnormity and faults are alarmed in real time, and alarm information is recorded through a historical database, so that troubleshooting and practical tracing are facilitated.
(6) The system online test module: routine tests of the nuclear power plant, such as cross contrast tests, channel verification and the like, can be carried out through the system.
Thermal fatigue analysis and evaluation module
(1) Fatigue evaluation module based on transient period statistics: the module classifies the temperature range through a rain flow method, and the analysis of the pipeline characteristic trend of the nuclear power plant after each operation cycle is completed.
(2) A transient-based fatigue evaluation module: the module can calculate the fatigue accumulation use factor of the pipeline by combining the cycle period identified by the fatigue evaluation module based on the transient period statistics with the original fatigue design analysis report of the nuclear power plant.
(3) Based on quick fatigue evaluation module of stress: the module is based on a local stress method, adopts unit transient state to carry out thermal load scanning, carries out cyclic stress calculation according to elasticity analysis, and finally calculates the fatigue accumulation use factor of the pipeline according to a designed fatigue curve.
The shells of the fatigue monitoring sensor assembly 1, the data acquisition unit 2, the photoelectric conversion unit 3 and the monitoring and analyzing and evaluating unit 4 in the embodiment are all provided with laser engraved two-dimensional codes, and the digital management of the system equipment can be realized through the two-dimensional codes.
The components, structures, methods of operation, and principles not specifically described in the above embodiments may be implemented using well-known or conventional means and conditions in the art.
The invention discloses a thermal fatigue monitoring system for a nuclear power plant pipeline, which mainly comprises a hardware system consisting of a fatigue monitoring sensor assembly, a data acquisition unit, a photoelectric conversion unit and a monitoring and analyzing and evaluating unit. The system measures temperature gradient data of fluid in a pipeline by installing a fatigue monitoring sensor assembly on a loop pipeline, the measured data is subjected to analog-to-digital conversion by a data acquisition unit, is transmitted outside a containment vessel through an electrical penetration piece by power carrier technology, is subjected to photoelectric conversion, and is provided for a monitoring and analysis evaluation unit to store and dynamically monitor, in addition, the data can be led into an analysis evaluation module, the evaluation module can evaluate the thermal fatigue damage state of the pipeline to different degrees according to different requirements through a fatigue evaluation module based on transient period statistics, a fatigue evaluation module based on transient state and 3 functional modules based on a stress rapid fatigue evaluation module, and the thermal fatigue accumulated use factor of the pipeline can be calculated, so that the system can be suitable for pipeline thermal fatigue monitoring of an in-service pressurized water reactor nuclear power plant.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (7)
1. A thermal fatigue monitoring system for a nuclear power plant pipeline is characterized by comprising a fatigue monitoring sensor assembly, a data acquisition unit, a photoelectric conversion unit and a monitoring and analyzing and evaluating unit, wherein the fatigue monitoring sensor assembly is arranged on a loop pipeline in a containment vessel; the fatigue monitoring sensor assembly comprises a thermocouple, a metal braided hose sleeved on part of the thermocouple, a mounting bracket for mounting the thermocouple on a pipeline and a sliding block for fixing the thermocouple on the mounting bracket; the data acquisition unit comprises an environmental sensor and is used for receiving analog signals measured by the fatigue monitoring sensor assembly and the environmental sensor, converting the analog signals into digital signals and outputting the digital signals; the photoelectric conversion unit is used for receiving the digital signal, converting the digital signal into an optical signal and transmitting the optical signal to the monitoring and analyzing and evaluating unit; the monitoring and analyzing and evaluating unit is used for receiving the optical signal and carrying out monitoring and analyzing and evaluating of thermal fatigue; the data acquisition unit comprises a metal shell, and a data acquisition module, a power supply module, a network module, a storage module, the environmental sensor and a first power carrier module which are positioned in the metal shell;
the mounting bracket comprises a short connecting pipe connected with one end of the metal braided hose, a steel belt connected with the short connecting pipe and connecting buckles connected with the two ends of the steel belt, wherein the steel belt is provided with a through groove for accommodating the thermocouple, and the extending direction of the through groove is the same as that of the steel belt;
the slider includes slider and apron down, be formed with the confession between slider and the apron down the arc wall that the thermocouple passed, offer on the slider down and be used for the confession the rectangle through-hole that the steel band runs through and the confession the circular through-hole that the probe of thermocouple ran through, circular through-hole follows the direction of height of slider down runs through, the extending direction of circular through-hole is perpendicular with the extending direction of rectangle through-hole.
2. The system of claim 1, wherein the steel strip has a coefficient of thermal expansion that is the same as a coefficient of thermal expansion of the pipe to be tested.
3. The system for monitoring the thermal fatigue of the nuclear power plant pipeline according to claim 1, wherein the lower sliding block and the cover plate are correspondingly provided with threaded holes, and the threaded holes extend downwards to the rectangular through hole.
4. The system for monitoring thermal fatigue of nuclear power plant pipelines according to claim 1, wherein the positive and negative conductors of the compensation cable are made of the same material as the thermocouple, and the non-metallic portion of the compensation cable can withstand a cumulative irradiation dose of at least 250 kGy.
5. The system of claim 1, wherein the first power carrier module is configured to load the digital signal on an ac power and output the digital signal by an electrical penetration after analog signals measured by the fatigue monitoring sensor assembly and the environmental sensor are converted into digital signals.
6. The system for monitoring the thermal fatigue of the nuclear power plant pipeline according to claim 1, wherein a second power carrier module for analyzing the signal loaded on the alternating current into a digital signal again and a photoelectric conversion module for converting the digital signal into an optical signal are arranged inside the transmitting end of the photoelectric conversion unit; the receiving end is used for converting the optical signal into a digital signal and transmitting the digital signal to the monitoring and analyzing and evaluating unit.
7. The system for monitoring the thermal fatigue of the nuclear power plant pipeline according to claim 1, wherein the monitoring and analyzing and evaluating unit comprises a disk array, a server, a display and a switch, the disk array is used for storing and physically redundantly backing up the acquired data, the server is used for running thermal fatigue monitoring and thermal fatigue analyzing and evaluating software, and the display is used for displaying the result.
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