Maintenance Plan Support Method and Maintenance Plan Support Device

Abstract

To provide a maintenance planning support apparatus capable of adequately supporting maintenance activities of a nuclear power plant.SOLUTION: A maintenance planning support apparatus 100 supports maintenance planning in a nuclear power plant by utilizing information from design and / or field. The maintenance planning support apparatus is provided with a maintenance planning unit 11 that formulates a maintenance plan, a maintenance and monitoring management unit 12 that manages condition monitoring and maintenance of the nuclear power plant, a field work plan process management unit 13 that manages a field work process based on the maintenance plan; and a maintenance planning support unit 14 for setting the performance of a corrective action period from the maintenance requirement period from the laws and regulations and the maintenance requirement period from the site at the time overlapping with these two periods in planning for correcting the equipment inspection, monitoring and patrol performed according to the maintenance plan based on the status of deterioration and failure defects.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a maintenance plan support method and a maintenance plan support device for supporting maintenance activities in a nuclear power plant.

Background Art

[0002] A nuclear power plant is composed of hundreds of systems and a large number of devices that make up those systems. In order to maintain safety while demonstrating the performance of the power plant, maintenance activities are carried out to maintain and improve reliability.

[0003] Although maintenance activities have been carried out under strict standards since the initial construction, considering recent regulatory trends, domestic and international operation records, and technological improvements since construction, there is a need to further optimize maintenance activities.

[0004] The equipment maintenance management device of Patent Document 1 is disclosed as having a host computer that formulates a production plan, a field equipment control device that operates / stops field equipment and grasps equipment operation results, and an equipment maintenance management computer that connects the host computer and the field equipment control device to perform preventive maintenance instructions and production plan support based on equipment maintenance prediction.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Since Patent Document 1 is a device that mainly performs maintenance management based on a production plan, it cannot be directly applied to the maintenance plan of a nuclear power plant.

[0007] In the operation of domestic nuclear power plants after the earthquake, higher reliability is required. As overseas examples, there are regulations with proven track records in the United States (ROP: Reactor Oversight Process) and industry best practices (for example, the Standard Nuclear Performance Model (SNPM)), all of which aim to optimize the maintenance process of existing reactor plants from a comprehensive perspective. Even in Japan, although the US regulations and operation records are different, it has been desired to construct a maintenance process that promotes comprehensive optimization with reference to the United States.

[0008] The present invention is an invention for solving the above problems, and an object thereof is to provide a maintenance plan support method and a maintenance plan support device that can appropriately support the maintenance activities of nuclear power plants.

Means for Solving the Problems

[0009] To achieve the above object, the maintenance plan support method of the present invention supports a maintenance plan by utilizing information from design and / or the site in a nuclear power plant. Of the maintenance plan support device In the maintenance plan support method, The processing unit of the maintenance plan support device In the inspection, monitoring, and patrol of facilities executed according to the maintenance plan, when formulating a maintenance plan to correct defects such as deterioration and failure based on the situation of defects, the execution period of corrective measures is set at the overlapping timing of these two periods from the maintenance requirement period from regulations and the maintenance requirement period from the site. Other aspects of the present invention will be described in the embodiments described later.

Effects of the Invention

[0010] According to the present invention, the maintenance activities of nuclear power plants can be appropriately supported.

Brief Description of the Drawings

[0011]

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Best Mode for Carrying Out the Invention

[0012] Embodiments for carrying out the present invention will be described in detail with reference to the drawings as appropriate. <Maintenance Plan Support System> FIG. 1 is a diagram showing the configuration of a maintenance plan support system 300 according to the present embodiment. The maintenance plan support system 300 includes a maintenance plan support device 100 and a database device 200 of an external storage device. The maintenance plan support device 100 includes a processing unit 10, a storage unit 20, an input unit 30, an output unit 40, and a communication unit 50. The processing unit 10 includes a maintenance plan formulation unit 11 for formulating a maintenance plan, a maintenance / monitoring management unit 12 for managing the condition monitoring and maintenance of a nuclear power plant, a field work plan process management unit 13 for managing the on-site work process based on the maintenance plan, a maintenance plan support unit 14, and the like. Note that condition monitoring and maintenance is a type of preventive maintenance method, which ensures safety by placing the target equipment (system, device) under certain monitoring and performing maintenance as necessary based on its failure, deterioration, or signs thereof.

[0013] The maintenance plan support unit 14 formulates a plan (plan formulation) for correcting a malfunction situation such as deterioration or failure in the inspection, monitoring, and patrol of equipment executed according to the maintenance plan. In formulating this plan, the execution period of the corrective measure is set at the overlapping timing of these two periods from the maintenance requirement period from regulations and the maintenance requirement period from the site. Details will be described later with reference to FIG. 2.

[0014] The storage unit 20 stores configuration management extraction information 21, FMEA extraction information 22, maintenance activity and monitoring item extraction information 23, field maintenance and monitoring extraction information 24, work plan management extraction information 25, field resource extraction information 26, maintenance plan information 27, process constraint information 28 (including constraints 28a by configuration management and 28b by maintenance activity and monitoring items), on-site work plan process information 29, etc. The configuration management extraction information 21, FMEA extraction information 22, maintenance activity and monitoring item extraction information 23, field maintenance and monitoring extraction information 24, work plan management extraction information 25, and field resource extraction information 26 are information obtained by extracting relevant data from the database device 200. The maintenance plan information 27, process constraint information 28, and on-site work plan process information 29 will be described later with reference to FIGS. 2 and 9 to 18.

[0015] In FIG. 1, the processing unit 10 is a central processing unit (CPU) that executes various programs stored in a RAM, HDD, etc. The storage unit 20 is an HDD that stores various data for the maintenance plan support device 100 to execute processing. The input unit 30 is a device for inputting instructions to a computer such as a keyboard and a mouse, and inputs instructions such as program startup. The output unit 40 is a display or the like that displays the execution status and execution results of processing by the maintenance plan support device 100. The communication unit 50 exchanges various data and commands with other devices via the network NW.

[0016] The database device 200 has a configuration management DB 210, an FMEA DB 220, a maintenance activity and monitoring item DB 230, a field maintenance and monitoring data DB 240, a work plan management DB 250, a field resource data DB 260, etc. Note that DB means database. FMEA is an abbreviation for Failure Mode and Effect Analysis, which is a systematic analysis method for potential failures aimed at preventing failures and malfunctions.

[0017] The data stored in each DB will be described. The configuration management DB 210 is a database composed of design requirements, design drawings, and entity data for a power plant.

[0018] FMEA DB220 is a database that includes the deterioration modes of equipment that constitutes a power plant, i.e., failure locations, deterioration mechanisms, effects of deterioration, severity of deterioration, frequency of deterioration, and effective maintenance activities and monitoring items.

[0019] The maintenance activity and monitoring item DB230 is a database that contains information on the maintenance activities and monitoring items of the power plant, that is, their contents, frequency, and the deterioration phenomena that are the subject of the maintenance. Here, the maintenance activities and monitoring items of the equipment to be maintained include those stipulated by laws and regulations, etc., in the configuration management DB210, and have the background of maintenance and monitoring to maintain the functions of the equipment (facilities, systems) that are more important from the viewpoint of maintaining safety.

[0020] The field maintenance and monitoring data DB240 is a database that stores the actual on-site conditions of the maintenance activities and monitoring items defined in the maintenance activity and monitoring item DB230. In other words, it is information on the deterioration state of the equipment (or information required to judge the deterioration state). When the results of the maintenance activities or the trend of the monitoring parameters may indicate a malfunction or deterioration, a request for corrective activities such as function recovery is generated. In addition, in the case of the maintenance activities and monitoring items related to the maintenance of the functions of the equipment (facilities, systems) defined by laws, regulations, etc. in the configuration management DB210, "process constraint information" (process constraint information 28 in FIG. 1) described later is often specified.

[0021] The work plan management DB250 is a database that stores standard information that is the basis for creating a site work plan. Specifically, it is a packaged piece of information (see Figure 7) related to the maintenance of a certain piece of equipment, and is a collection of multiple individual maintenance activities (= work orders) that make up the maintenance of that piece of equipment. In order to create a work plan with a certain amount of time, number of people, and parts, it is a database that contains information that organizes standard time, work personnel, and parts and equipment required for that work for each work order.

[0022] The field resource data DB260 is a database that includes, among the resources defined in the field maintenance and monitoring data DB240, in particular, data including the on-site situation of the number of people and parts. That is, it stores personnel (type of work, qualifications, period, number of people) with a foreseeable availability and parts and equipment (type, number of employees, period) for replacement and work. When the plan for a certain maintenance work, that is, the work content and period are determined, by comparing the field maintenance and monitoring data DB240 and the field resource data DB260, it becomes possible to determine, for example, whether the work can be handled during that period, that is, to judge the work feasibility.

[0023] <Overview of the maintenance plan support department> FIG. 2 is a diagram showing an overview of the maintenance plan support unit 14 according to the present embodiment. The maintenance plan support unit 14 has a function of adjusting processes from the maintenance plan information 27 (see FIGS. 9 and 10) and the process constraint information 28, formulating, and adjusting the on-site work plan process. As described above, the maintenance plan support unit 14 is involved in formulating a plan for correcting deterioration and malfunction situations based on the deterioration and malfunction situations in the inspection, monitoring, and patrol of equipment executed according to the maintenance plan. The execution period of the corrective measures is set at the overlapping timing of these two periods from the maintenance requirement period from the legal regulations and the maintenance requirement period from the site. Note that the maintenance plan information 27 will be described later with reference to FIGS. 9 and 10.

[0024] The process constraint information 28 includes a constraint 28a based on configuration management and a constraint 28b by maintenance activities and monitoring items. Each constraint will be described with reference to FIG. 2.

[0025] Constraint 28a based on configuration management shows the constraint period P1 by configuration management. In order for the power generation plant to satisfy safety and functions related to power generation, it is necessary to satisfy the design requirements such as laws and regulations in the configuration management DB210. In particular, the maintenance of functions for equipment (facilities, systems) related to safety is required. Therefore, when disassembling and inspecting a certain piece of equipment, it is necessary to temporarily "stop (function loss)" the functions of the system to which the equipment belongs. For example, there may be a setting of "Allowed Outage Time (AOT)", and it is necessary to finish the work within a predetermined "period". In this way, the constraint on the time from the "start of work" when the function is lost, such as disassembly inspection, to the "end of work" when the function is restored, is an example of the "process constraint information" by "configuration management".

[0026] Constraint 28b by maintenance activities and monitoring items shows the constraint period P2 by maintenance activities and monitoring items. On the other hand, the "process constraint" by "maintenance and monitoring data" gives an instruction to perform maintenance for the period until "failure is estimated" starting from the "current situation" of when the thing will fail.

[0027] The on-site work plan process information 29 shows the work period FP0 (working time) planned by the maintenance plan support department 14, the disassembly inspection work period FP2 planned as on-site work, and the reserve period FP3 (reserve time) to ensure that even in case of emergency, it does not exceed the constraint period P1 by configuration management. That is, the maintenance plan support department 14 can set the execution of the period of corrective measures at the overlapping timing (the start point of the disassembly inspection work period FP2) in these two periods from the maintenance requirement period from laws and regulations (the constraint period P1 by configuration management) and the maintenance requirement period from the site (the constraint period P2 by maintenance activities and monitoring items).

[0028] The maintenance plan support department 14 formulates a field operation plan based on the constraints for implementing a certain activity (= work order) related to the maintenance of a certain device during a certain period, taking into account a contingency buffer time. It is necessary to confirm the feasibility of the operation, that is, whether it is possible to respond with the personnel, parts, and equipment that can actually be secured for the operations and periods required in the plan. Therefore, the maintenance plan support department 14 inquires with the field operation plan process management department 13 and provides feedback in the form of a request for relaxation or substitution of constraints when it is difficult to ensure the feasibility of the operation.

[0029] <Example of the configuration data of each DB> Figure 3 is a diagram showing an example of the configuration data of the configuration management DB210. The configuration management DB210 is composed of categories and their configuration data. The categories include design requirements, facility configuration information, and physical configuration. For example, the design requirements include legal regulations, design standard documents, and calculation / analysis results. The legal regulations shall include safety regulations such as the security regulations submitted by the electric utility company to the Nuclear Regulation Authority for review

[0030] Figure 4 is a diagram showing an example of the configuration data of the FMEA DB220. The FMEA DB220 has data such as device names, degradation modes, effective maintenance activities, and monitoring items. The degradation modes include failure locations, degradation mechanisms, impacts of degradation, severity of degradation, and frequency of degradation. According to Figure 4, in the case of the XX valve, it can be seen that there is a possibility of leakage due to resin degradation in the seal part.

[0031] Figure 5 is a diagram showing an example of the configuration data of the maintenance activity / monitoring item DB230. The maintenance activity / monitoring item DB230 has data on maintenance activities, maintenance frequencies, degradation events to be targeted, etc., and data on monitoring items, monitoring frequencies, degradation events to be targeted, etc. Specifically, it can be seen that when the target device is the XX valve, as a maintenance activity, non-destructive inspection of XX is carried out every X years.

[0032] FIG. 6 is a diagram showing an example of configuration data of the field maintenance and monitoring data DB 240. The field maintenance and monitoring data DB 240 in FIG. 6 is data corresponding to the maintenance activity and monitoring item DB 230 in FIG. 5, and has data such as maintenance activities, maintenance frequencies, results (achievements) of maintenance activities, etc., and data such as monitoring items, monitoring frequencies, monitoring results (achievements), etc.

[0033] FIG. 7 is a diagram showing an example of configuration data of the work plan management DB 250. The work plan management DB 250 has work packages, standard planned values, and related documents. Specifically, in the non-destructive inspection of XX, it can be seen that the work order ID number is A01, there are 2 workers, and the inspection is carried out using an inspection device for 3 hours.

[0034] FIG. 8 is a diagram showing an example of configuration data of the field resource data DB 260. The field resource data DB 260 has the on-site situation and its detailed information. For example, in the regular inspection, it includes the personnel situation of each operation, the number of people and the period, the situation of parts and equipment, the number of personnel and units, and the period.

[0035] <Maintenance plan information> FIG. 9 is a diagram showing an example of the list information 27a of the maintenance plan information 27. FIG. 10 is a diagram showing an example of the chart information 27b of the maintenance plan information 27. The list information 27a in FIG. 9 has information on the operation cycle period, subsequent fuel replacement, and regular inspection period for stopping the plant for maintenance as the master process, and also has information such as equipment to be maintained, maintenance activities, number of personnel, etc. in the next regular inspection (periodic inspection).

[0036] The chart information 27b in FIG. 10 has information on the content and number of days in the regular inspection. In the figure, LPRM is the local power range monitor, SPNM is the startup range monitor, and FMCRD is the improved control rod drive mechanism.

[0037] <Details of the maintenance plan support process> FIG. 11 is a flowchart showing details of the maintenance plan support process S100. When the maintenance and monitoring management department 12 discovers a defect or a sign of a defect in the equipment to be maintained through the planned maintenance activities of the nuclear power plant (such as monitoring during operation and inspection during plant shutdown) (step S1), it evaluates the necessity of corrective measures for the defect (step S2). If corrective measures for the defect are not necessary (step S2, not necessary), the process ends. If the maintenance and monitoring management department 12 determines that corrective measures for the defect are necessary (step S2, necessary), it notifies the maintenance plan support department 14 to that effect and proceeds to step S3.

[0038] In step S3, the maintenance plan support department 14 obtains design requirement information regarding corrective measures from the maintenance plan information 27 and the process constraint information 28. That is, it extracts the constraints of configuration management (laws and regulations, etc.).

[0039] In step S4, the maintenance plan support department 14 obtains field information from the maintenance and monitoring management department 12. Specifically, it obtains information such as how much the target equipment has deteriorated and when it is expected to fail.

[0040] In step S5, the maintenance plan support department 14 adjusts the process from the maintenance plan information 27 and the process constraint information 28, formulates a field work plan process, and transmits it to the field work plan process management department 13 as the field work plan process information 29.

[0041] In step S6, when the field work plan process management department 13 receives the field work plan process information 29, it obtains field information. Specifically, in the plan in step S5, it obtains information regarding the work for function recovery for correction, resources such as personnel, parts, and equipment during the period, and the preparation status at the site.

[0042] In step S7, the on-site work planning process management unit 13 adds the information from step S6 to the proposed on-site work plan and evaluates whether the work can be carried out (work feasibility). If the work can be carried out (step S7, process feasible), the maintenance planning support unit 14 and the work site are notified and the process ends. On the other hand, if the work cannot be carried out (step S7, not feasible), a on-site work planning process table 29A (see FIG. 12) that can be carried out with the current resources, etc. is sent to the maintenance planning support unit 14.

[0043] In step S8, when the maintenance planning support unit 14 receives the field work plan schedule 29A, it readjusts (resets) the schedule and returns to step S5. In step S8, if it is determined that the work is not feasible, it requests reevaluation of the constraints, such as partial load operation of the equipment, switching of the system, and reevaluation of the deterioration state.

[0044] FIG. 12 is a diagram showing an example of a functional block of the maintenance plan support device 100. The maintenance plan support unit 14 has a function of coordinating each unit of the maintenance plan planning unit 11, the maintenance and monitoring management unit 12, and the field work planning process management unit 13. ャ As explained above, when the maintenance plan support unit 14 receives notice of a malfunction symptom from the maintenance and monitoring management unit 12, it adjusts the schedule based on the maintenance plan information 27 and the process constraint information 28, prepares field work plan schedule information 29 (prepares a first plan), and transmits it to the field work plan schedule management unit 13. The field work plan schedule management unit 13 evaluates the feasibility of the work, and if the schedule is not acceptable, transmits a field work plan schedule 29A to the maintenance plan support unit 14 (requests readjustment). When the maintenance plan support unit 14 receives the request for readjustment, it notifies the maintenance plan formulation unit 11 and the maintenance and monitoring management unit 12 of the request and performs readjustment (prepares a second plan).

[0045] In addition, if the maintenance plan support unit 14 determines that the process constraints cannot be satisfied when formulating the first plan, it notifies the maintenance plan formulation unit 11 and the maintenance / monitoring management unit 12 of this fact and formulates an adjusted plan (second plan).

[0046] <Example of on-site work plan process> An example of the first draft of the on-site work plan process will be described with reference to FIGS. 13 and 14. An example of the second draft of the on-site work plan process will be described with reference to FIGS. 15 to 18.

[0047] FIG. 13 is a diagram showing an example of process constraint information (when it can be planned during a regular inspection). FIG. 14 is a diagram showing an example of on-site work plan process information in FIG. 13. The examples in FIGS. 13 and 14 are cases where, for example, the progress of deterioration found during operation monitoring is slow and it is determined that the device will function until the next regular inspection. That is, during the regular inspection period, maintenance of the device is performed.

[0048] In FIG. 13, the maintenance plan support unit 14 acquires maintenance plan information 27 and process constraint information 28 (constraint 28a by configuration management, constraint 28b by maintenance activities and monitoring items), and sets the execution of the corrective action period at overlapping timings in two periods so as to satisfy the constraint period P1 from the design requirements and the constraint period P2 from the results of maintenance and monitoring. The disassembly inspection work period FP2 planned as on-site work for the corrective action period and the reserve period FP3 considering risks such as delays satisfy the constraint period P1 from the design requirements and the constraint period P2 from the results of maintenance and monitoring. Note that the work period FP0 is the period from the start of the inspection work including preparations to the end of the inspection work including withdrawal in the on-site work plan.

[0049] FIG. 14 shows the details of the on-site work plan process information in FIG. 13. The work period FP0 in the disassembly inspection of the XX pump is composed of a preparation period FP1, a disassembly inspection work period FP2, a reserve period FP3, and a withdrawal period FP4.

[0050] FIG. 15 is a diagram showing an example of process constraint information (when it is necessary to perform maintenance by the next regular inspection). For example, it is a case where during operation, the progress of deterioration found during operation monitoring is fast and it is determined that the device will not function until the next regular inspection.

[0051] In FIG. 15, as maintenance plan information 27, an operation cycle period PS0 and process constraint information 28 (constraint 28a by configuration management, constraint 28b by maintenance activities and monitoring items) are shown. In the constraint 28b by maintenance activities and monitoring items, the time when a loss of function of the device is assumed during the operation cycle period PS0 is included. The time when a loss of function of the device is assumed will be described with reference to FIG. 16.

[0052] FIG. 16 is a diagram for explaining a method of evaluating "the time when a loss of function (such as a failure) of the device is assumed" from on-site inspection and monitoring information. In explanatory diagram 161, when past trends can be obtained, the failure time is estimated by extrapolating from the trends. When the extrapolated value from the trends reaches the management threshold value of the deterioration management index, it is the time when a loss of function (such as a failure) of the device is assumed. The deterioration management index is, for example, compression set in the case of a rubber O-ring.

[0053] In explanatory diagram 162, when past trends cannot be obtained, the failure time (or maintenance time) is estimated from literature values or past performance. For example, when there is a design life of 5 years as a literature value or industry knowledge, and 2 years have passed since use, it corresponds to the case of judging that it will last for another 3 years.

[0054] Returning to FIG. 15, the maintenance plan support unit 14 acquires the maintenance plan information 27 and the process constraint information 28 (constraint 28a by configuration management, constraint 28b by maintenance activities and monitoring items), and evaluates whether it is possible to set the execution of the corrective action period at the overlapping timing in the two periods so as to satisfy the constraint period P1 from the design requirements and the constraint period P2 from the maintenance and monitoring results. As the corrective action period, the disassembly inspection work period FP2 planned as on-site work and the reserve period FP3 considering risks such as delays need to satisfy the constraint period P1 from the design requirements and the constraint period P2 from the maintenance and monitoring results, but the disassembly inspection work period FP2 planned as on-site work does not satisfy the constraint conditions. That is, the first plan is not established, and it is necessary to consider a second plan. As the second plan, when the plant is stopped for maintenance (see FIG. 1 7 reference), when the system is switched and operated (see FIG. 1 8 reference), etc. are shown below.

[0055] Figure 17 is a diagram showing an example (part 1) of the on-site work plan process information in Figure 15. Figure 1 7 is the case of stopping the plant for maintenance. For the initial operation cycle period PS0, the plant is stopped by the time when the loss of function of the equipment is assumed. The period after the change is the operation cycle period PS0A. In the case of Figure 17, the execution of the corrective action period is set at overlapping timings in two periods so as to satisfy the constraint period P1 from the design requirements and the constraint period P2 from the results of maintenance and monitoring.

[0056] Figure 18 is a diagram showing an example (part 2) of the on-site work plan process information in Figure 15. Figure 1 8 is the case of switching the system for operation. When it is not possible to cope during the regular inspection in Figure 15, the operation cycle is as planned by switching the system including the deteriorated equipment for operation, and the corrective action is implemented during the regular inspection without stopping the plant in the middle.

[0057] The process constraint information 28 is shown in the upper diagram of Figure 18. In this case, the assumed failure time of the "constraint from the results of maintenance and monitoring" comes during the operation cycle. As a countermeasure, it is considered that it is not zero if corrective actions (such as online maintenance) are implemented during operation as long as it conforms to the regulatory permission. However, as other options, after considering possibilities such as switching the system (system operation) including the equipment in which deterioration is detected or partial load operation of the equipment, if the constraint of the "time when the loss of function of the equipment is assumed" can be delayed, the feasibility of the on-site work process may be obtained.

[0058] The adjusted process constraint information 28A is shown in the middle diagram of Figure 18. In the adjusted process constraint information 28A, the assumed failure time of the "constraint from the results of maintenance and monitoring" has increased because by switching the system, the equipment is not "used", or by operating the equipment at partial load, the environment in which deterioration progresses has been alleviated.

[0059] In FIG. 18, the maintenance plan support unit 14 can set the execution of the period of corrective measures at overlapping timings in two periods so as to satisfy the constraint period P1A from the design requirements and the constraint period P2A from the results of maintenance and monitoring. As the corrective measure period, the disassembly inspection work period FP2 planned as on-site work and the reserve period FP3 considering risks such as delays satisfy the constraint period P1 from the design requirements and the constraint period P2 from the results of maintenance and monitoring. Note that the work period FP0 is the period from the start of the inspection work including preparations to the end of the inspection work including withdrawal in the on-site work plan. The work period FP0 is composed of a preparation period FP1, a disassembly inspection work period FP2, a reserve period FP3, and a withdrawal period FP4.

[0060] <Effect> Next, as the positioning of the maintenance plan support unit 14, an explanation will be given of what maps the information utilized in the embodiment to three processes of CM (Configuration Management), ER (Equipment Reliability), and WM (Work Management).

[0061] FIG. 19 is a diagram showing the relationship between three processes of CM (Configuration Management), ER (Equipment Reliability), and WM (Work Management). Each of the processes of CM, ER, and WM has its own process purpose, such as management of whether equipment meets requirements in CM, management of equipment reliability and availability in ER, and management of work safety and productivity in WM. However, by utilizing the information mutually referred to in the three processes, an effect can be obtained of optimizing maintenance activities comprehensively and integratively. That is, the maintenance plan support unit 14 of the present embodiment has an adjustment function for the processes of CM, ER, and WM, and has an effect of optimizing maintenance activities.

[0062] The maintenance plan support method and the maintenance plan support apparatus 100 of the present embodiment described above have the following features. (1) In a maintenance plan support method for supporting a maintenance plan by utilizing information from design and / or the site in a nuclear power plant, in inspections, monitoring, and patrols of facilities carried out according to the maintenance plan, when formulating a maintenance plan to correct defects such as deterioration and failure based on the situation of such defects, the execution period of the corrective measures is set at the overlapping timing between the maintenance requirement period from regulations and the maintenance requirement period from the site for these two periods. According to this, the maintenance activities of the nuclear power plant can be appropriately supported.

[0063] (2) The maintenance requirement period from regulations is set as the corrective measure period by imposing the regulatory constraints regarding the period when the function required for the equipment is lost due to the maintenance work assumed as the corrective measure for the equipment in which defects such as deterioration and failure have occurred.

[0064] (3) The maintenance requirement period from the site is set as the corrective measure period by evaluating the time when the function required for the equipment is lost using the information on the situation of defects such as deterioration and failure from the site in the equipment in which such defects have occurred, and setting the period from the time when the defect is discovered to the time when the function is lost as the corrective measure period.

[0065] (4) When the corrective measures cannot be carried out on-site during the corrective measure period, it can be re-set considering the impact on the surroundings of the work scope.

[0066] (5) The impact on the surroundings of the work scope is evaluated for the feasibility of on-site work by comparing the work plan management information including the standard time, personnel, parts and materials required for the maintenance activities, the number of workers who can be prepared on-site during the once-planned corrective measure period, and the resource preparation information including either or both the number of parts and materials required for the maintenance activities.

[0067] (6) In a nuclear power plant, there is a maintenance plan support device 100 that utilizes design and / or on-site information to support the maintenance plan. The maintenance plan support device 100 includes a maintenance plan formulation unit 11 that formulates a maintenance plan, a maintenance and monitoring management unit 12 that manages the condition monitoring and maintenance of the nuclear power plant, a on-site work plan process management unit 13 that manages the on-site work process based on the maintenance plan, and a maintenance plan support unit 14 that, in the inspection, monitoring, and patrol of equipment executed according to the maintenance plan, sets the execution period of the corrective measure at the overlapping timing of the two periods of the maintenance requirement period from the regulations and the maintenance requirement period from the on-site, in formulating a plan to correct based on the situation of deterioration and malfunction. According to this, the maintenance activities of the nuclear power plant can be appropriately supported.

[0068] Note that 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 for easy understanding of the present invention and are not necessarily limited to those having all the configurations described. Also, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, for a part of the configuration of each embodiment, addition, deletion, or replacement with other configurations is possible. Also, the above-described respective configurations, functions, processing units, processing means, etc. may be realized in hardware, for example, by designing a part or all of them with an integrated circuit. Also, the above-described respective configurations, functions, etc. may be realized in software by a processor interpreting and executing a program that realizes each function. Information such as a program, table, file, etc. that realizes each function can be placed in a memory, a recording device such as a hard disk, SSD (Solid State Drive), or a recording medium such as an IC card, SD card, DVD.

Description of Reference Numerals

[0069] 10 Processing unit 11 Maintenance plan formulation unit 12 Maintenance and monitoring management unit 13 On-site work plan process management unit 14 Maintenance Plan Support Department 20 Memory Unit 21 Configuration Management Extracted Information 22 FMEA Extracted Information 23 Maintenance Activity and Monitoring Item Extracted Information 24 Field Maintenance and Monitoring Extracted Information 25 Work Plan Management Extracted Information 26 Field Resource Extracted Information 27 Maintenance Plan Information 28 Process Constraint Information 29 On-site Work Plan Process Information 30 Input Unit 40 Output Unit 50 Communication Unit 100 Maintenance Plan Support Device 200 Database Device 210 Configuration Management DB 220 FMEA DB 230 Maintenance Activity and Monitoring Item DB 240 Field Maintenance and Monitoring Data DB 250 Work Plan Management DB 260 Field Resource Data DB 300 Maintenance Plan Support System S100 Maintenance Plan Support Process CM Configuration Management ER Equipment Reliability WM Work Management

Claims

1. In a nuclear power plant, in a maintenance plan support method for a maintenance plan support device that utilizes information from design and / or the site to support a maintenance plan, the processing unit of the maintenance plan support device in the inspection, monitoring, and patrol of facilities executed according to the maintenance plan, when formulating a maintenance plan to correct based on the status of defects such as deterioration and failure, the execution period of the corrective measures is set at the overlapping timing of these two periods from the maintenance requirement period based on regulations and the maintenance requirement period from the site. A maintenance plan support method characterized by the above.

2. The maintenance requirement period based on regulations is, for facilities where defects such as deterioration and failure have occurred, the constraints of regulations regarding the period during which the functions required for the facility are lost due to maintenance work assumed as the corrective measures for the facility, and is set as the period of the corrective measures. The maintenance plan support method according to Claim 1, characterized by the above.

3. The maintenance requirement period from the site is, for facilities where defects such as deterioration and failure have occurred, by using information on the status of defects such as deterioration and failure from the site, the time when the functions required for the facility are lost is evaluated, and the period from the time when the defect is discovered to the time when the function is lost is set as the period of the corrective measures. The maintenance plan support method according to Claim 1, characterized by the above.

4. The processing unit of the maintenance plan support device, when the corrective measures cannot be performed on-site during the period of the corrective measures, for the case of stopping the plant for maintenance by the time when the loss of function of the equipment is assumed with respect to the initial operation cycle period, or for the case of formulating a maintenance plan for implementing the corrective measures during the regular inspection without stopping the plant in the middle by switching the system including the deteriorated equipment and operating it, and re-setting it in consideration of the impact on the surroundings of the work scope. The maintenance plan support method according to Claim 1, characterized by the above.

5. The impact on the surroundings of the work scope is evaluated for the feasibility of the work on-site by comparing the work plan management information including the standard time, personnel, parts and materials required for the maintenance activity, the number of workers who can be prepared on-site during the period of the corrective measures once planned, and the information on the preparation of resources including either or both of the number of parts and materials required for the maintenance activity. The maintenance plan support method according to Claim 4, characterized by the above.

6. A maintenance plan support device that utilizes information from design and / or the site in a nuclear power plant to support a maintenance plan, comprising: A maintenance plan formulation unit that formulates a maintenance plan; A maintenance and monitoring management unit that manages the condition monitoring and maintenance of the nuclear power plant; A field work plan process management unit that manages the field work process based on the maintenance plan; A maintenance plan support unit that, in the inspection, monitoring, and patrol of equipment executed according to the maintenance plan, sets the execution of the period of corrective measures at the overlapping timing of these two periods from the maintenance requirement period from regulations and the maintenance requirement period from the site when formulating a plan to correct based on the situation of defects such as deterioration and failure; A maintenance plan support device characterized by the above.

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