Plant reliability evaluation system, plant reliability evaluation method, and plant reliability evaluation program

Abstract

To provide a plant reliability evaluation system capable of improving the reliability of equipment including not only conventional equipment but also large structures such as structural materials and weld lines. by simultaneously utilizing in-service inspections and operating parameters of nuclear facilities in a plant.SOLUTION: A plant reliability evaluation system S comprises: a corrosion potential sensor 4; a first water quality measuring unit; a dose rate monitor; a detection unit 511 for taking these pieces of measurement data as environment information of a plant during operation; a storage unit for storing a material composition forming a nuclear reactor, deterioration data of the material, and inspection results; a soundness monitoring unit 514 for always monitoring soundness of equipment forming the plant, on the basis of environment information of the plant during operation, the environment information not being taken in reliability evaluation of equipment regulated by the Institute of Nuclear Power Operations in the United States; and a life cycle management unit 516 for planning a repair plan for the plant on the basis of the soundness evaluation result, and performing life cycle management.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a plant reliability evaluation system, a plant reliability evaluation method, and a plant reliability evaluation program. [Background technology]

[0002] Reliability-based maintenance methods for systems and components are required for nuclear facilities such as nuclear power plants, Fukushima decommissioning, and reprocessing facilities.

[0003] Patent Document 1 describes an invention of a facility management support system that is expected to be highly convenient to operate by reviewing the template contents. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-189088 Summary of the Invention [Problem to be solved by the invention]

[0005] The method used in the United States has the problem that it requires a long period of time and a large amount of resources to evaluate the deterioration of systems and equipment based on the results of in-service inspections (ISI).

[0006] The US Reactor Oversight Process (ROP), which the Nuclear Regulatory Commission referenced after the earthquake, requires constant monitoring of the integrity of the entire nuclear power plant. Toward operation for over 40 years, constant monitoring of the reliability of not only conventional equipment but also large structures such as structural materials and weld lines is necessary.

[0007] Therefore, the present invention aims to improve the equipment reliability (ER) of not only conventional equipment but also large structures such as structural materials and weld lines by simultaneously utilizing in-service inspections and operating parameters of nuclear equipment. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the plant reliability evaluation system of the present invention includes an electrochemical corrosion potential sensor that measures the electrochemical corrosion potential of the water quality in the lower plenum region of the reactor, a first water quality measurement device that is connected to the drain pipe of the reactor by a sampling pipe and that measures the hydrogen concentration in the reactor water, a dose rate monitor that measures the dose rate of the piping of the reactor, a detection unit that takes in the measurement data of the electrochemical corrosion potential sensor, the first water quality measurement device, and the dose rate monitor as environmental information of the plant during operation, and a memory unit that stores the composition of materials that make up the reactor, material degradation data, and inspection results. before Based on the environmental information of the plant during operation, such as the corrosion potential, the hydrogen concentration, and the dose rate, as well as the material composition, deterioration data of the material, and inspection results, a system for constructing the plant is provided. Machine The system comprises a health monitoring unit that constantly monitors the health of the equipment, and a life cycle management unit that formulates a repair plan for the plant and performs life cycle management based on the results of the equipment health evaluation by the health monitoring unit.

[0009] The method for evaluating the reliability of a plant of the present invention includes a step of measuring the corrosion potential of the water quality in the lower plenum region of a nuclear reactor using an electrochemical corrosion potential sensor; a step of measuring the hydrogen concentration in the reactor water using a first water quality measurement device connected to a drain pipe of the nuclear reactor by a sampling pipe; a step of measuring the dose rate of the piping of the nuclear reactor using a dose rate monitor; a step of storing the composition of materials constituting the nuclear reactor, material degradation data, and inspection results using a memory unit; a step of capturing the measurement data of the electrochemical corrosion potential sensor, the first water quality measurement device, and the dose rate monitor as environmental information of the plant during operation using a detection unit; But beforeBased on the environmental information of the plant during operation, such as the corrosion potential, the hydrogen concentration, and the dose rate, as well as the material composition, deterioration data of the material, and inspection results, a system for constructing the plant is provided. Machine and a step of having a life cycle management unit formulate a repair plan for the plant and perform life cycle management based on the results of the equipment health evaluation by the health monitoring unit.

[0010] The plant reliability evaluation program of the present invention includes the steps of: a computer measuring the corrosion potential of the water quality in the lower plenum region of the reactor using an electrochemical corrosion potential sensor; a computer measuring the hydrogen concentration in the reactor water using a first water quality measurement device connected to the drain pipe of the reactor by a sampling pipe; a computer measuring the dose rate of the reactor pipe using a dose rate monitor; a computer acquiring measurement data from the electrochemical corrosion potential sensor, the first water quality measurement device, and the dose rate monitor as environmental information of the plant during operation; and a computer storing in a memory unit the composition of materials constituting the reactor, degradation data of materials, and inspection results. before Based on the environmental information of the plant during operation, such as the corrosion potential, the hydrogen concentration, and the dose rate, as well as the material composition, deterioration data of the material, and inspection results, a system for constructing the plant is provided. Machine The purpose of this system is to carry out the following procedures: a procedure for constantly monitoring the health of the equipment; and a procedure for formulating a repair plan for the plant and carrying out life cycle management based on the results of the health evaluation of the equipment. Other means will be described in the detailed description of the invention. [Effects of the Invention]

[0011] According to the present invention, by simultaneously utilizing in-service inspections and operational parameters of nuclear facilities, reliability of equipment can be improved, including not only conventional equipment but also large structures such as structural materials and weld lines. [Brief explanation of the drawings]

[0012] [Figure 1]FIG. 1 is a diagram illustrating reliability and life cycle management of equipment in a nuclear power plant according to an embodiment of the present invention. [Figure 2] FIG. 1 is a configuration diagram of a reliability evaluation system for a nuclear power plant. [Figure 3] FIG. 1 is a configuration diagram of a nuclear power plant. [Figure 4] FIG. 2 is a hardware configuration diagram of a server. [Figure 5] FIG. 2 is a hardware configuration diagram of a terminal. [Figure 6] FIG. 1 is a functional block diagram of a reliability evaluation system for a nuclear power plant. [Figure 7] FIG. 1 is a diagram illustrating reliability and life cycle management of weld lines in a nuclear power plant. [Figure 8] FIG. 1 is a diagram illustrating reliability and life cycle management of piping in a nuclear power plant. [Figure 9] 10 is a flowchart showing a routine inspection process according to a comparative example. [Figure 10] FIG. 1 is a diagram illustrating reliability and life cycle management of equipment in a nuclear power plant according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, a comparative example will be described with reference to Figures 9 and 10, and a preferred embodiment of the present invention will be described with reference to Figures 1 to 8. In the following description, the same components will be denoted by the same reference numerals and the description thereof will be omitted as appropriate.

[0014] <<Operation of Comparative Example>> 9 is a flowchart showing the process of periodic inspection in a comparative example, which is carried out with the operation of the nuclear power plant stopped. The inspector starts the inspection during the periodic inspection (step S40). In the comparative example, structural materials, weld lines, etc. related to the soundness of the reactor are inspected and evaluated separately. The inspector evaluates the inspection results (step S41) and sets the inspection cycle (step S42).

[0015] Next, the inspector replaces the facility / equipment (step S43) and reflects this in a large-scale repair plan (step S44). Finally, the inspector evaluates the plant life (step S45), and the process of FIG. 9 ends.

[0016] Figure 10 is a diagram showing the reliability and life cycle management of equipment in a nuclear power plant as a comparative example, and is based on AP-913 of the Nuclear Power Operations Association in the U.S. AP-913 is a diagram showing the process for managing the reliability of equipment and facilities related to the operation of a power generation nuclear reactor and the life cycle of the plant.

[0017] First, the management system classifies the importance (step S50) and monitors performance according to this importance (step S51). Then, the administrator continuously improves the reliability of the equipment according to this importance (step S53). The administrator performs preventive maintenance on the facility / equipment (step S54). The facility / equipment for which preventive maintenance has been performed becomes the target of the performance monitoring process (step S51).

[0018] Based on the performance monitoring results, the manager takes corrective action for the facility / equipment (step S52). The results of the corrective action are then fed back to the performance monitoring process (step S51) and the process for continuously improving the reliability of the equipment (step S53).

[0019] Finally, the administrator performs life cycle management (step S55) based on the continuous device reliability improvement process (step S53), corrective measures (step S52), and performance monitoring process (step S51).

[0020] Operation and Configuration of This Embodiment In this embodiment, the reliability of the entire power plant is visualized by introducing the soundness evaluation of structural materials and large structures into the conventional AP913 concept.

[0021] With a view to operating for over 40 years, it will be possible to constantly monitor the reliability of not only conventional equipment but also large structures such as structural materials and weld lines. This will be reflected in optimal inspections, equipment replacement, and large-scale repair work, optimizing costs while ensuring reliability.

[0022] FIG. 1 is a diagram showing reliability and life cycle management of equipment in a nuclear power plant according to this embodiment. The reliability assessment system S shown in Fig. 2 classifies structures by their importance (step S10). The importance of a structure affects the safety system inside the reactor, the integrity of the fuel inside the reactor, and the release of radioactive materials outside the system. The importance of a structure is determined not only by legal standards but also by factors such as the results of previous inspections, the fluids it comes into contact with under operating conditions, and the types and concentrations of chemical substances contained in the reactor water in the reactor pressure vessel during operation.

[0023] The types of structures classified in step S10 include reactor pressure vessels, shrouds, shroud supports, jet pumps, grid plates and other reactor internal structures, equipment related to the insertion of control rods, turbine casings, bearings, condensers, generators and hydrogen supply equipment, heat exchangers for the old condensate system, fuel support plates, main piping connecting equipment whose safety importance and power generation importance are higher than the threshold, etc. Nuclear facilities also include fuel processing plants, nuclear fuel cycle plants, radioactive waste disposal sites, etc.

[0024] In step S11, the reliability assessment system S monitors the health of the structure. Health monitoring involves evaluating the current reliability of the structure based on previous inspection results and conventional knowledge such as the operational status of the plant P, maintenance specifications, standards, and papers. The reliability assessment system S may further monitor the health of the structure based on periodic inspection information of the plant P.

[0025] Based on the type of structure classified in step S10, the reliability evaluation system S continuously improves the reliability of the equipment (step S13). Specifically, the reliability evaluation system S performs inspection and mitigation (step S14). In the inspection step, the reliability evaluation system S selects an inspection frequency and inspection method that minimizes costs while ensuring reliability, taking into account the inspection results, maintenance standards, laws, and regular inspection processes. In the mitigation step, the reliability evaluation system S instructs the worker's terminal 6 to perform stress relaxation and / or environmental mitigation (step S14). In response to this, the worker performs stress relaxation and / or environmental mitigation on the structure.

[0026] The reliability assessment system S takes measures for the operation method based on the monitoring results of the soundness of the structure (step S12). Here, measures for the operation method include improving the operation and operation method of the plant P, strengthening sampling, changing the operation of mitigation techniques, etc.

[0027] The reliability evaluation system S optimizes the repair plan based on the results of health monitoring, the results of operational measures, and the results of continuous improvements to the structure's reliability (step S15). The optimization of the repair plan here is life cycle management, which requires large-scale construction and inspection. Therefore, the reliability evaluation system S optimizes the plan to minimize costs while ensuring the reliability of the structure, taking into account the long-term periodic inspection process.

[0028] FIG. 2 is a configuration diagram of a reliability evaluation system S for a nuclear power plant P. The reliability evaluation system S includes a server 5, a usage environment information sensor 58, an electrochemical corrosion potential sensor 4, and a plurality of terminals 6.

[0029] The server 5 is a computer that embodies the functional parts of the reliability evaluation system S. The terminal 6 is an input / output device for accessing the server 5. The usage environment information sensor 58 is a sensor that detects the usage environment of the equipment that constitutes the plant P. The corrosion potential sensor 4 is a sensor that detects corrosive environment information of the equipment that constitutes the plant P.

[0030] FIG. 3 is a configuration diagram of a nuclear power plant P. Plant P is a boiling water nuclear power plant and includes a reactor pressure vessel 20, a reactor containment vessel 21, a turbine 22, a recirculation system piping 23, a reactor cleanup system 24, and multiple corrosion potential measuring devices. Reactor pressure vessel 20, which is installed inside reactor containment vessel 21, contains a core 25 loaded with multiple fuel assemblies (not shown).

[0031] Each of the two recirculation systems has a recirculation system piping 23 and a recirculation pump 26. A main steam piping 27 connected to the reactor pressure vessel 20 is connected to the turbine 22. A condenser 28 connected to the turbine 22 is connected to the reactor pressure vessel 20 by a condensate piping 29 and then a feedwater piping 30. An off-gas system piping 31 is connected to the condenser 28. The off-gas system piping 31 is connected to the condensate piping 29, and a dose rate monitor 32 is installed near the main steam piping 27.

[0032] The reactor clean-up system 24 has piping connected to the recirculation system piping 23 and a drain piping 33 connected to the bottom of the reactor pressure vessel 20, and has a purification device (not shown) within the system. The reactor clean-up system 24 is connected to the feedwater piping 30.

[0033] Water quality measuring device 34a is connected to drain pipe 33 by sampling pipe 35a, and water quality measuring device 34b is connected to reactor cleanup system 24 by sampling pipe 35b. Water quality measuring device 34c is connected to feedwater pipe 30 by sampling pipe 35c, and water quality measuring device 34d is connected to main steam pipe 27 by sampling pipe 35d.

[0034] The electrochemical corrosion potential sensor 4 is installed at a relevant location in a boiling water nuclear power plant using the local power range monitor outer tube 1. The electrochemical corrosion potential sensor 4 is installed at a corresponding position in the lower plenum 36 in order to measure the water quality in the lower plenum 36 at the bottom of the reactor pressure vessel 20. In this case, in order to measure the electrochemical corrosion potential near the pressure vessel bottom head 8, the electrochemical corrosion potential sensor 4 is installed at a height near the pressure vessel bottom head, and a electrochemical corrosion potential measurement window (not shown) is opened at that height.

[0035] When measuring corrosion potential using a local power range monitor, it is not possible to obtain a direct correlation with the sampled water quality, such as oxygen, hydrogen peroxide, etc. However, when measuring corrosion potential near the pressure vessel bottom head 8 as described above, reactor water can be sampled using sampling pipe 35a and measured with water quality measuring device 34a.

[0036] By measuring the corrosion potential in this way, the amount of hydrogen injected into the feedwater from the off-gas system piping 31, which is a hydrogen injection device, is adjusted so that the corrosion potential in the lower plenum 36 decreases to a target value. Excess hydrogen injected into the reactor water in the reactor pressure vessel 20 is discharged to the off-gas system piping 31 via the main steam piping 27, the turbine 22, and the condenser 28. The excess hydrogen discharged to the off-gas system piping 31 is combined with oxygen in a recombiner (not shown) provided in the off-gas system piping 31 and treated.

[0037] The hydrogen concentration of the feedwater is obtained by measuring the feedwater sampled through sampling pipe 35c with water quality measuring device 34c. The dose rate in main steam pipe 27 during hydrogen injection is monitored by dose rate monitor 32.

[0038] In this method, multiple corrosion potential sensors 4 can be arranged on the LPRMM outer tube 1, and by installing them at multiple locations in the boiling water nuclear power plant, it is possible to three-dimensionally map the corrosive environment in the lower plenum 36 where stress corrosion cracking (SCC) occurs in the structural members of the boiling water nuclear power plant. As a result, it is possible to provide a maintenance measure for ensuring the long-term safety, soundness, and reliability of the nuclear power plant.

[0039] FIG. 4 is a diagram showing the hardware configuration of the server 5. As shown in FIG. The server 5 is, for example, a computer installed in a data center. The server 5 includes a CPU (Central Processing Unit) 51, a storage unit 57, a ROM (Read Only Memory) 52, a RAM (Random Access Memory) 53, an operation unit 54, a display unit 55, and a communication unit 56.

[0040] The CPU 51 is a central processing unit that executes a program 571 stored in the storage unit 57. The program 571 is executed by the CPU 51 to perform the processes shown in FIG. The CPU 61 executes the program 571 to implement the respective functional units shown in Fig. 6. Note that the respective processes executed by the CPU 61 will be described later with reference to Figs.

[0041] The storage unit 57 is a large-capacity storage device, and is configured, for example, by a hard disk drive or flash memory.

[0042] The RAM 53 is a volatile memory and functions as a work area for temporarily storing various programs executable by the CPU 51, input data, output data, parameters, etc. The ROM 52 is a non-volatile memory and stores, for example, a BIOS (Basic I / O System).

[0043] The operation unit 54 is configured with a keyboard equipped with cursor keys, numeric input keys, various function keys, etc., and a pointing device such as a mouse. The operation unit 54 detects press signals of keys pressed on the keyboard and operation signals from the mouse. The CPU 51 executes various processes based on the operation signals from the operation unit 54.

[0044] The display unit 55 is configured to include a monitor display such as an LCD (Liquid Crystal Display), etc. The display unit 55 displays various screens according to display signals input from the CPU 51. The display unit 55 and the operation unit 54 may also employ a touch panel display.

[0045] FIG. 5 is a diagram showing the hardware configuration of the terminal 6. As shown in FIG. The terminal 6 is, for example, a tablet terminal owned by each worker. The terminal 6 includes a CPU 61, a storage unit 67, a ROM 62, a RAM 63, a touch panel display 64, and a communication unit 66.

[0046] The CPU 61 is a central processing unit that executes a program 671 stored in the storage unit 67. The program 671 is, for example, a browser, and is executed by the CPU 61 to realize input / output processing with the server 5.

[0047] The storage unit 67 is a large-capacity storage device, and is configured, for example, by a hard disk drive or flash memory.

[0048] The RAM 63 is a volatile memory and functions as a work area for temporarily storing various programs executable by the CPU 61, input data, output data, parameters, etc. The ROM 62 is a non-volatile memory and stores, for example, the BIOS.

[0049] The touch panel display 64 is a display such as an LCD with a transparent touch panel superimposed on it. The touch panel display 64 detects press signals generated by pressing the touch panel. The CPU 61 executes various processes based on the operation signals from the touch panel display 64. The touch panel display 64 then displays various screens based on display signals input from the CPU 61.

[0050] FIG. 6 is a functional block diagram of a reliability evaluation system S for a nuclear power plant. The reliability evaluation system S includes a detection unit 511 , an importance classification unit 512 , a periodic inspection information reception unit 513 , a health monitoring unit 514 , a preventive maintenance unit 515 , and a life cycle management unit 516 . The detection unit 511 detects environmental information of the operating plant P. The environmental information detected by the detection unit 511 includes any of the types and concentrations of chemical substances contained in reactor water in the operating reactor pressure vessel, the types of materials, and construction data at the time of construction.

[0051] The health monitoring unit 514 constantly monitors the health of the equipment that constitutes the plant P based on environmental information about the plant P during operation and importance information about the equipment that constitutes the plant P. Note that the health monitoring unit 514 may also constantly monitor the health of the equipment that constitutes the plant P based on periodic inspection information and / or standard information about the plant P, and is not limited to this.

[0052] The preventive maintenance unit 515 instructs preventive maintenance for each device based on the health evaluation result of the devices constituting the plant P during operation by the health monitoring unit 514. The life cycle management unit 516 formulates a repair plan for the plant P based on the preventive maintenance instructions for corrosion of the equipment given by the preventive maintenance unit 515 and the results of the equipment health evaluation given by the health monitoring unit 514.

[0053] The periodic inspection information receiving unit 513 receives input of periodic inspection information and / or standard information of the plant P. Note that the periodic inspection information receiving unit 513 is not an essential component.

[0054] The importance classifying unit 512 classifies the importance of the devices that make up the plant P. Note that the importance classifying unit 512 is not an essential component, and the importance of the devices may be classified manually.

[0055] FIG. 7 is a diagram showing the reliability and life cycle management of weld lines in a nuclear power plant. Types of weld lines include those found on reactor pressure vessels, shrouds, shroud supports, jet pumps, grid plates and other reactor internal structures, as well as on equipment related to the insertion of control rods, turbine casings, bearings, condensers, generators and hydrogen supply equipment, and the joints between structures and piping such as the heat exchangers of the old condensate system.

[0056] The reliability assessment system S classifies the weld lines by their importance (step S20). The importance of a weld line is determined based on factors such as whether it affects the safety system inside the reactor, the integrity of the fuel inside the reactor, whether it affects the release of radioactive materials outside the system, whether it is stipulated by law, conventional knowledge, factors that affect long-term integrity assessment such as the welding method, the type of welding, the metal used for welding, and post-processing such as polishing after welding, the fluid with which it comes into contact, and the type and concentration of chemical substances contained in the reactor water in the reactor pressure vessel during operation.

[0057] The reliability evaluation system S monitors the soundness of the weld line (step S21). Specifically, the soundness monitoring of the weld line evaluates the current reliability of the weld line based on previous inspection results and conventional knowledge such as the operational status of the plant P, maintenance standards, criteria, and papers.

[0058] Based on the type of weld line classified in step S20, the reliability evaluation system S continuously improves the reliability of the equipment (step S23). Specifically, the reliability evaluation system S performs inspection and mitigation (step S24). In the inspection, the reliability evaluation system S selects an inspection frequency and inspection method that minimizes costs while ensuring reliability, taking into account the inspection results, maintenance standards, laws, and regular inspection processes. Then, in the mitigation, the reliability evaluation system S instructs stress relaxation and / or environmental mitigation (step S24). In response to this, workers perform stress relaxation and / or environmental mitigation on the weld line.

[0059] The reliability evaluation system S takes measures for the operation method based on the monitoring results of the soundness of the weld line (step S22). Here, measures for the operation method include improving the operation and operation method of the plant P, strengthening sampling, changing the operation of mitigation techniques, etc.

[0060] The reliability evaluation system S optimizes the repair plan based on the results of health monitoring, the results of operational measures, and the results of continuous improvements to the equipment reliability (step S25). The optimization of the repair plan here is life cycle management, which requires large-scale construction and inspections. Therefore, the reliability evaluation system S optimizes the plan to minimize costs while ensuring the reliability of the facilities and equipment, taking into account the long-term periodic inspection process.

[0061] FIG. 8 is a diagram showing the reliability and life cycle management of piping in a nuclear power plant. The type of piping includes the type of fluid that flows through it, its material, whether it is installed on the reactor side, turbine side, or rad equipment. The type of liquid is whether it contains water, steam, or chemicals.

[0062] The reliability evaluation system S classifies the piping by importance (step S30). The importance classification of the piping is determined based on factors such as whether it affects the safety system inside the reactor, the integrity of the fuel inside the reactor, whether it affects the release of radioactive materials outside the system, whether it is determined by law, company regulations, or standards, and environmental factors such as the concentration of radioactive materials and the type and concentration of chemical substances.

[0063] The reliability evaluation system S monitors the soundness of the piping (step S31). Specifically, the monitoring of the soundness of the piping evaluates the current reliability of the piping based on previous inspection results, the operating status of the plant, maintenance specifications, standards, papers, and other conventional knowledge.

[0064] Based on the type of weld seam classified in step S30, the reliability evaluation system S continuously improves the reliability of the equipment (step S33). Specifically, the reliability evaluation system S performs inspection and mitigation (step S34). In the inspection step, the reliability evaluation system S selects an inspection frequency and inspection method that minimizes costs while ensuring reliability, taking into account the inspection results, maintenance standards, laws, and periodic inspection processes. Then, in the mitigation step, the reliability evaluation system S performs stress relaxation and / or environmental mitigation.

[0065] The reliability evaluation system S takes measures for the operation method based on the monitoring results of the soundness of the weld line (step S32). Here, measures for the operation method include improving the operation and operation method of the plant P, strengthening sampling, changing the operation of mitigation techniques, etc.

[0066] The reliability evaluation system S optimizes the repair plan based on the results of health monitoring, the results of operational measures, and the results of continuous improvements to the equipment reliability (step S35). The optimization of the repair plan here is life cycle management, which requires large-scale construction and inspections. Therefore, the reliability evaluation system S optimizes the plan to minimize costs while ensuring the reliability of the equipment, taking into account the long-term periodic inspection process.

[0067] By incorporating the corrosion environment, material composition, material degradation data, and inspection results that were previously obtained during in-service inspections into the equipment reliability, rather than the equipment reliability defined by the Institute of Nuclear Power Operations (INPO), it becomes possible to constantly monitor the deterioration status of structures, equipment, and systems, making it easier to constantly monitor the health of plant P and evaluate the plant life cycle.

[0068] <<Variation>> The present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the described configurations. It is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is also possible to add, delete, or replace part of the configuration of each embodiment with other configurations.

[0069] The above-described configurations, functions, processing units, processing means, etc. may be realized in part or in whole by hardware such as an integrated circuit. The above-described configurations, functions, etc. may be realized by software by a processor interpreting and executing a program that realizes each function. Information such as the programs, tables, and files that realize each function can be stored in a storage device such as a memory, a hard disk, or an SSD (Solid State Drive), or on a storage medium such as a flash memory card or a DVD (Digital Versatile Disk).

[0070] In each embodiment, the control lines and information lines shown are those that are considered necessary for the explanation, and not all control lines and information lines in the product are necessarily shown. In reality, it can be considered that almost all components are interconnected. [Explanation of symbols]

[0071] S Reliability Evaluation System 1 Local Power Range Monitor Outer Tube 20. Reactor Pressure Vessel 21 Reactor containment vessel 22 Turbine 23 Recirculation system piping 24 Reactor Cleanup System 25 reactor core 26 Recirculation Pump 27 Main steam pipe 28 Condenser 29 Condensate piping 30 Water supply piping 31 Off-gas system piping 32 Dose rate monitor 33 Drain piping 34a~34d Water quality measuring device 35a~35c Sampling piping 35d Sampling piping 4. Corrosion potential sensor 5 Server 51 CPU 511 Detection unit 512 Importance classification section 513 Periodic Inspection Information Reception Department 514 Health Monitoring Department 515 Preventive Maintenance Department 516 Life Cycle Management Department 52 ROM 53 RAM 54 Control section 55 Display section 56 Communications Department 57 Memory section 58 Operating environment information sensor 6 Terminals 61 CPU 62 ROM 63 RAM 64 Touch Panel Display 66 Communications Department 67 Memory section

Claims

1. a corrosion potential sensor for measuring the corrosion potential of the water chemistry in the lower plenum region of the reactor; a first water quality measuring device connected to a drain pipe of the reactor by a sampling pipe and configured to measure a hydrogen concentration in the reactor water; a dose rate monitor for measuring a dose rate in the reactor piping; a detection unit that acquires measurement data from the corrosion potential sensor, the first water quality measurement device, and the dose rate monitor as environmental information of the operating plant; a memory unit that stores the composition of materials constituting the reactor, deterioration data of the materials, and inspection results; a health monitoring unit that constantly monitors the health of equipment constituting the plant based on the environmental information of the plant during operation, which includes the corrosion potential, the hydrogen concentration, and the dose rate, as well as the material composition, material degradation data, and inspection results; a life cycle management unit that formulates a repair plan for the plant and performs life cycle management based on the results of the equipment health evaluation by the health monitoring unit; A plant reliability evaluation system comprising:

2. a second water quality measuring device connected to the reactor purification system by a sampling pipe and configured to measure a hydrogen concentration; a third water quality measuring device connected to the reactor water supply pipe by a sampling pipe and measuring a hydrogen concentration; a fourth water quality measurement device connected to the main steam pipe of the reactor by a sampling pipe and configured to measure a hydrogen concentration; 2. The plant reliability evaluation system according to claim 1, further comprising:

3. The plant is a power plant including a nuclear reactor pressure vessel.

2. The plant reliability evaluation system according to claim 1.

4. said equipment being related to control rod insertion and reactor internals; 4. The plant reliability evaluation system according to claim 3.

5. The equipment is any one of a reactor pressure vessel, a shroud, a shroud support, a jet pump, a grid plate, a fuel support plate, and a main piping connecting equipment whose safety importance and power generation importance are higher than a threshold value.

4. The plant reliability evaluation system according to claim 3.

6. The equipment includes any one of a structure, a welded line, and a pipe.

4. The plant reliability evaluation system according to claim 3.

7. a periodic inspection information receiving unit that receives input of periodic inspection information and / or standard information of the plant; Further provided with the health monitoring unit constantly monitors the health of the equipment based on the environmental information during operation, periodic inspection information and / or standard information of the plant; 2. The plant reliability evaluation system according to claim 1.

8. an importance classification unit that classifies the importance of the device; 2. The plant reliability evaluation system according to claim 1, further comprising:

9. a corrosion potential sensor measuring the corrosion potential of the water chemistry in the lower plenum region of the reactor; a first water quality measuring device connected to a drain pipe of the reactor by a sampling pipe and measuring a hydrogen concentration in the reactor water; a dose rate monitor measuring a dose rate in the reactor piping; a step in which a memory unit stores the composition of materials constituting the reactor, deterioration data of the materials, and inspection results; a detection unit acquiring measurement data from the corrosion potential sensor, the first water quality measurement device, and the dose rate monitor as environmental information of the operating plant; a health monitoring unit constantly monitoring the health of equipment constituting the plant based on the environmental information of the operating plant, which is the corrosion potential, the hydrogen concentration, and the dose rate, as well as the material composition, material degradation data, and inspection results; a step in which a life cycle management unit formulates a repair plan for the plant based on the equipment health evaluation result by the health monitoring unit and performs life cycle management; A plant reliability evaluation method comprising:

10. The computer a procedure for measuring the corrosion potential in the water quality of the lower plenum region of a nuclear reactor by means of an corrosion potential sensor; measuring a hydrogen concentration in reactor water of the nuclear reactor by a first water quality measuring device connected to a drain pipe of the nuclear reactor by a sampling pipe; measuring the dose rate of the reactor piping with a dose rate monitor; a step of acquiring measurement data from the corrosion potential sensor, the first water quality measuring device, and the dose rate monitor as environmental information of the operating plant; a procedure for storing the composition of materials constituting the reactor, deterioration data of the materials, and inspection results in a storage unit; a procedure for constantly monitoring the health of equipment constituting the plant based on the environmental information of the plant during operation, which is the corrosion potential, the hydrogen concentration, and the dose rate, as well as the material composition, material degradation data, and inspection results; a procedure for formulating a repair plan for the plant and performing life cycle management based on the results of the equipment health assessment; Plant reliability assessment program to carry out.

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