Method, device and computer equipment for controlling the construction period of preventive maintenance projects in nuclear power plants

Abstract

The present application relates to the technical field of nuclear power plant maintenance optimization, and provides a method, device, computer equipment, storage medium and computer program product for controlling the duration of a preventive maintenance project of a nuclear power plant. The method comprises: obtaining each historical duration of each preventive maintenance project of the nuclear power plant in a historical time period; determining the standard duration of each preventive maintenance project; determining the actual duration of each preventive maintenance project in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance project in a preset number of maintenance cycles adjacent to the current maintenance cycle before the corresponding current maintenance cycle, as the actual duration set of each preventive maintenance project; judging whether it is necessary to modify the standard duration of the corresponding preventive maintenance project according to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project. The use of this method can improve the maintenance efficiency of nuclear power plants.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear power plant maintenance optimization, and in particular to a method, device and computer equipment for controlling the construction period of a preventive maintenance project of a nuclear power plant. Background Art

[0002] To ensure the safe and reliable operation of equipment, nuclear power plants have formulated preventive maintenance strategies for on-site equipment. Usually, for a nuclear power plant with two million-kilowatt pressurized water reactors, the number of preventive maintenance projects is between 20,000 and 30,000. Compared with corrective maintenance, preventive maintenance projects have better standardized basic conditions and optimization value.

[0003] In related technologies, these projects often issue a large number of preventive maintenance work orders regularly. However, due to the large number and variety of preventive maintenance projects in nuclear power plants, the actual duration of maintenance work is affected by the technical level and skill proficiency of operators, the availability and status of operating tools, the required process and process changes of the operation, and the operating environment. This makes it more arbitrary to apply for professional duration, and there is no unified and objective duration measurement standard, which makes it difficult to control the unit status and arrange production maintenance activities, and reduces the maintenance efficiency of nuclear power plants. Therefore, there is an urgent need for a method for controlling the duration of preventive maintenance projects in nuclear power plants. Summary of the invention

[0004] Based on this, it is necessary to provide a method, device, computer equipment, computer-readable storage medium and computer program product for controlling the construction period of preventive maintenance projects in nuclear power plants, which can improve the maintenance efficiency of nuclear power plants, in response to the above-mentioned technical problems.

[0005] In a first aspect, the present application provides a method for controlling the duration of a preventive maintenance project in a nuclear power plant. The method comprises:

[0006] Obtain each historical duration of each preventive maintenance project of the nuclear power plant in the historical time period. The historical duration refers to the time taken by the staff to repair each project in the historical time period. Each preventive maintenance project has a corresponding maintenance cycle.

[0007] Determine the average standard duration of each preventive maintenance project based on each historical duration of each preventive maintenance project;

[0008] Determine the standard duration of each preventive maintenance project based on the average standard duration of each preventive maintenance project;

[0009] Determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as the actual duration set of each preventive maintenance item;

[0010] Based on the standard duration of each preventive maintenance project and the actual duration of each preventive maintenance project, determine whether the standard duration of the corresponding preventive maintenance project needs to be modified.

[0011] In one embodiment, obtaining each historical duration of each preventive maintenance project of a nuclear power plant in a historical period includes:

[0012] Determine the time when the staff of each preventive maintenance project of the nuclear power plant in each maintenance cycle receives the work permit and the time when the work permit is returned;

[0013] The interval between the time of obtaining the work permit and the time of returning the work permit is taken as the historical duration of each preventive maintenance project in the corresponding maintenance cycle.

[0014] In one embodiment, according to each historical duration of each preventive maintenance project, determining the average standard duration of each preventive maintenance project includes:

[0015] Determine all historical construction periods of each preventive maintenance project of the nuclear power plant in the historical time period, except for the shortest historical construction period and the longest historical construction period, as the historical construction period set of each preventive maintenance project;

[0016] Calculate the average of the historical duration set of each preventive maintenance project as the average standard duration of each preventive maintenance project.

[0017] In one embodiment, determining the standard duration of each preventive maintenance project according to the average standard duration of each preventive maintenance project includes:

[0018] Determine the environmental correction factor for each preventive maintenance item;

[0019] The product of the environmental correction coefficient of each preventive maintenance item and the average standard construction period of the corresponding preventive maintenance item is taken as the standard construction period of the corresponding preventive maintenance item.

[0020] In one embodiment, judging whether it is necessary to modify the standard duration of each preventive maintenance project according to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project includes:

[0021] Determine the preset quantity value corresponding to each preventive maintenance item, and the preset quantity value is used to determine whether the standard duration of each preventive maintenance item needs to be modified;

[0022] Determine a first actual duration set and a second actual duration set of each preventive maintenance project according to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project;

[0023] According to the preset quantity value corresponding to each preventive maintenance item, and the first actual duration set and the second actual duration set of each preventive maintenance item, it is determined whether the standard duration of the corresponding preventive maintenance item needs to be modified.

[0024] In one embodiment, determining a first actual duration set and a second actual duration set of each preventive maintenance project according to a standard duration of each preventive maintenance project and an actual duration set of each preventive maintenance project includes:

[0025] Determining a first difference threshold and a second difference threshold for each preventive maintenance item;

[0026] The actual duration of each preventive maintenance project that meets the first preset condition is set as the first actual duration set of each preventive maintenance project, wherein the first preset condition includes that the actual duration in the actual duration set is greater than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than a first difference threshold;

[0027] The actual construction period of each preventive maintenance project that meets the second preset condition is collected as the second actual construction period set. The second preset condition includes that the actual construction period in the actual construction period set is less than the standard construction period of the corresponding preventive maintenance project, and the difference between the actual construction period of each preventive maintenance project and the standard construction period of the corresponding preventive maintenance project is greater than the second difference threshold.

[0028] In one embodiment, judging whether it is necessary to modify the standard duration of the corresponding preventive maintenance item according to the preset quantity value corresponding to each preventive maintenance item and the first actual duration set and the second actual duration set of each preventive maintenance item includes:

[0029] If the number of actual durations in the first actual duration set or the second actual duration set in any preventive maintenance project is not less than the preset number value, the standard duration of the corresponding preventive maintenance project needs to be modified.

[0030] In a second aspect, the present application also provides a device for controlling the duration of a preventive maintenance project in a nuclear power plant. The device comprises:

[0031] An acquisition module is used to acquire each historical duration of each preventive maintenance project of the nuclear power plant in the historical time period. The historical duration refers to the time taken by the staff to repair each project in the historical time period. Each preventive maintenance project has a corresponding maintenance cycle;

[0032] The first determination module is used to determine the average standard duration of each preventive maintenance project based on each historical duration of each preventive maintenance project;

[0033] The second determination module is used to determine the standard duration of each preventive maintenance project according to the average standard duration of each preventive maintenance project;

[0034] A third determination module is used to determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as an actual duration set of each preventive maintenance item;

[0035] The judgment module is used to judge whether the standard construction period of each preventive maintenance project needs to be modified according to the standard construction period of each preventive maintenance project and the actual construction period set of each preventive maintenance project.

[0036] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0037] Obtain each historical duration of each preventive maintenance project of the nuclear power plant in the historical time period. The historical duration refers to the time taken by the staff to repair each project in the historical time period. Each preventive maintenance project has a corresponding maintenance cycle.

[0038] Determine the average standard duration of each preventive maintenance project based on each historical duration of each preventive maintenance project;

[0039] Determine the standard duration of each preventive maintenance project based on the average standard duration of each preventive maintenance project;

[0040] Determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as the actual duration set of each preventive maintenance item;

[0041] According to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project, it is determined whether the standard duration of the corresponding preventive maintenance project needs to be modified.

[0042] In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0043] Obtain each historical duration of each preventive maintenance project of the nuclear power plant in the historical time period. The historical duration refers to the time taken by the staff to repair each project in the historical time period. Each preventive maintenance project has a corresponding maintenance cycle.

[0044] Determine the average standard duration of each preventive maintenance project based on each historical duration of each preventive maintenance project;

[0045] Determine the standard duration of each preventive maintenance project based on the average standard duration of each preventive maintenance project;

[0046] Determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as the actual duration set of each preventive maintenance item;

[0047] According to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project, it is determined whether the standard duration of the corresponding preventive maintenance project needs to be modified.

[0048] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0049] Obtain each historical duration of each preventive maintenance project of the nuclear power plant in the historical time period. The historical duration refers to the time taken by the staff to repair each project in the historical time period. Each preventive maintenance project has a corresponding maintenance cycle.

[0050] Determine the average standard duration of each preventive maintenance project based on each historical duration of each preventive maintenance project;

[0051] Determine the standard duration of each preventive maintenance project based on the average standard duration of each preventive maintenance project;

[0052] Determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as the actual duration set of each preventive maintenance item;

[0053] According to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project, it is determined whether the standard duration of the corresponding preventive maintenance project needs to be modified.

[0054] The above-mentioned method, device, computer equipment, storage medium and computer program product for controlling the construction period of preventive maintenance projects of nuclear power plants obtain each historical construction period of each preventive maintenance project of the nuclear power plant in the historical time period; determine the average standard construction period of each preventive maintenance project based on each historical construction period of each preventive maintenance project; determine the standard construction period of each preventive maintenance project based on the average standard construction period of each preventive maintenance project; determine the actual construction period of each preventive maintenance project within the corresponding current maintenance cycle, and the actual construction period of each preventive maintenance project within a preset number of maintenance cycles adjacent to the current maintenance cycle before the corresponding current maintenance cycle, as the actual construction period set of each preventive maintenance project; determine whether the standard construction period of the corresponding preventive maintenance project needs to be modified based on the standard construction period of each preventive maintenance project and the actual construction period set of each preventive maintenance project; and can improve the maintenance efficiency of nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 An application environment diagram of a method for controlling a construction period of a preventive maintenance project in a nuclear power plant according to an embodiment;

[0056] Figure 2 It is a flowchart of a method for controlling the construction period of a preventive maintenance project in a nuclear power plant in one embodiment;

[0057] Figure 3 It is a structural block diagram of a nuclear power plant preventive maintenance project duration control device in one embodiment;

[0058] Figure 4 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] The method for controlling the duration of a nuclear power plant preventive maintenance project provided in the embodiment of the present application can be applied to Figure 1In the application environment shown. Among them, the terminal 101 communicates with the server 102 through the network. The data storage system can store the data that the server 102 needs to process. The data storage system can be integrated on the server 102, or it can be placed on the cloud or other network servers. The terminal obtains data such as historical construction periods, and calculates the average standard construction period based on the historical construction period and other data; then, based on the average standard construction period, the standard construction period of each preventive maintenance project is calculated, and based on the standard construction period of each preventive maintenance project and the actual construction period set of each preventive maintenance project, it is determined whether the standard construction period of the corresponding preventive maintenance project needs to be modified. Among them, the terminal 101 can be but is not limited to various personal computers, laptops, smart phones, tablet computers and Internet of Things devices. The server 102 can be implemented with an independent server or a server cluster consisting of multiple servers.

[0061] In one embodiment, Figure 2 As shown in the figure, a method for controlling the construction period of a nuclear power plant preventive maintenance project is provided. Figure 1 The terminal in is used as an example to illustrate, including the following steps:

[0062] 201. Obtain each historical duration of each preventive maintenance project of the nuclear power plant in the historical time period. The historical duration refers to the time taken by the staff to repair each project in the historical time period. Each preventive maintenance project has a corresponding maintenance cycle.

[0063] 202. Determine the average standard duration of each preventive maintenance project based on the historical duration of each preventive maintenance project;

[0064] 203. Determine the standard duration of each preventive maintenance project based on the average standard duration of each preventive maintenance project;

[0065] 204. Determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as the actual duration set of each preventive maintenance item;

[0066] 205. According to the standard construction period of each preventive maintenance project and the actual construction period set of each preventive maintenance project, determine whether the standard construction period of the corresponding preventive maintenance project needs to be modified.

[0067] In the above step 201, the embodiment of the present invention does not specifically limit the preventive maintenance items of the nuclear power plant, including but not limited to annual inspection of motors, annual inspection of water pumps, annual lubrication of motors, five-year disassembly inspection of chilled water circulation pumps, two-year oil change of gear boxes, three-year fixed value and alarm inspection, six-month inspection of fire dampers, and five-year disassembly inspection of chilled water circulation pumps. The preventive maintenance items of the nuclear power plant are determined according to actual needs.

[0068] Specifically, each preventive maintenance item corresponds to a maintenance cycle, and the maintenance cycles of different preventive maintenance items may be the same or different. For example, the maintenance cycle of the motor annual inspection and the water pump annual inspection is one year, and the maintenance cycle of the fire damper semi-annual inspection is half a year.

[0069] In addition, each preventive maintenance project and each maintenance cycle corresponds to a historical construction period. For example, if the historical time period is from January 1, 2018 to January 1, 2020, and the motor annual inspection project is maintained and inspected, then the motor annual inspection preventive maintenance project has a total of two maintenance inspections, of which the first maintenance inspection was carried out from January 1, 2018 to January 1, 2019, and the duration of this maintenance project is one historical construction period, and the second maintenance inspection was carried out from January 1, 2019 to January 1, 2020, and the duration of this maintenance project is another historical construction period.

[0070] In the above step 203, the standard duration of each preventive maintenance project is recorded in the SAP (System Applications and Productions in Data Processing) system.

[0071] In the above step 204, the actual duration set of each preventive maintenance item includes the actual duration of the corresponding preventive maintenance item in the current maintenance cycle, and the actual duration of the corresponding preventive maintenance item in a preset number of maintenance cycles adjacent to the current maintenance cycle. For example, if the preset number is 9, the actual duration set of each preventive maintenance item includes 10 actual durations.

[0072] It can be understood that if the preset number is 9, then the preset number of maintenance cycles adjacent to the current maintenance cycle refers to: 9 maintenance cycles before the current maintenance cycle and adjacent to the current maintenance cycle.

[0073] Specifically, before the staff conducts maintenance inspection on each preventive maintenance project, they need to fill in the application period of this maintenance inspection on the SAP system. The application period is the estimated time required for this inspection by the staff. If the difference between the application period and the standard period of the corresponding preventive maintenance project exceeds the preset difference, the staff also needs to fill in the reason for the period exceeding the limit, and select the reason classification according to the reason for the period exceeding the limit. Based on the standard period of each preventive maintenance project and the actual period set of each preventive maintenance project, it can be determined whether the standard period of all preventive maintenance projects needs to be modified.

[0074] The method provided by the embodiment of the present invention can determine whether it is necessary to modify the standard duration of the corresponding preventive maintenance project through the actual duration of each preventive maintenance project in the corresponding current maintenance cycle and the actual duration of each preventive maintenance project in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, thereby improving the accuracy of the standard duration on the SAP system, thereby improving the maintenance efficiency of the nuclear power plant and further reducing the maintenance cost of the nuclear power plant.

[0075] In combination with the content of the above embodiment, in one embodiment, obtaining each historical duration of each preventive maintenance project of a nuclear power plant in a historical time period includes:

[0076] 301. Determine the time when the staff of each preventive maintenance project of the nuclear power plant in each maintenance cycle receives the work permit and the time when the work permit is returned;

[0077] 302. The interval between the time of obtaining the work permit and the time of returning the work permit is used as the historical duration of each preventive maintenance item in the corresponding maintenance cycle.

[0078] Specifically, before the staff inspects each preventive maintenance project, they need to obtain the corresponding work permit for the preventive maintenance project. When the staff obtains the work permit, the SAP system will record the time when the staff obtains the work permit. After the staff completes the inspection of each preventive maintenance project, they need to return the work permit for the corresponding preventive maintenance project. At this time, the SAP system will record the time when the staff returns the work permit. By calculating the interval between the time of obtaining the work permit and the time of returning the work permit for each preventive maintenance project, the historical duration of the corresponding preventive maintenance project within the corresponding maintenance cycle can be determined.

[0079] In addition, obtaining each historical duration of each preventive maintenance project of the nuclear power plant within the historical time period also includes: determining, within the historical time period, for each preventive maintenance project, the earliest time when the staff swiped in the access control card and the latest time when the access control card was swiped out in each maintenance cycle; using the time difference between the earliest time when the access control card was swiped in and the latest time when the access control card was swiped out in each maintenance cycle as the historical duration of the corresponding preventive maintenance project in the corresponding maintenance cycle.

[0080] The method provided in the embodiment of the present invention can determine the historical duration of the corresponding preventive maintenance item within the corresponding maintenance cycle by calculating the interval between the time of obtaining the work permit and the time of returning the work permit for each preventive maintenance item.

[0081] In combination with the content of the above embodiments, in one embodiment, according to each historical duration of each preventive maintenance item, determining the average standard duration of each preventive maintenance item includes:

[0082] 401. Determine all historical construction periods of each preventive maintenance project of the nuclear power plant in the historical time period, except for the shortest historical construction period and the longest historical construction period, as the historical construction period set of each preventive maintenance project;

[0083] 402. Calculate the average value of the historical duration set of each preventive maintenance project as the average standard duration of each preventive maintenance project.

[0084] Specifically, according to the referee scoring method, the shortest historical construction period and the longest historical construction period among all historical construction periods of each preventive maintenance project are removed, and the remaining historical construction periods are used as the historical construction period set of the corresponding preventive maintenance project. Then, the average value of the historical construction period set of each preventive maintenance project is calculated as the average standard construction period of each preventive maintenance project.

[0085] The method provided by the embodiment of the present invention screens all historical construction periods of each preventive maintenance project through a referee scoring method, thereby preventing the influence of extreme historical construction periods in all historical construction periods of each preventive maintenance project, thereby improving the applicability of the average standard construction period of each preventive maintenance project.

[0086] In combination with the content of the above embodiments, in one embodiment, determining the standard duration of each preventive maintenance item according to the average standard duration of each preventive maintenance item includes:

[0087] 501. Determine the environmental correction factor for each preventive maintenance item;

[0088] 502. The product of the environmental correction coefficient of each preventive maintenance project and the average standard construction period of the corresponding preventive maintenance project is taken as the standard construction period of the corresponding preventive maintenance project.

[0089] In the above step 502, the standard duration refers to the prescribed duration of the corresponding preventive maintenance project. In the SAP system, each preventive maintenance project has a corresponding standard duration. When the staff needs to inspect any preventive maintenance project, the application duration of the corresponding preventive maintenance project will be entered in the SAP system.

[0090] Specifically, in a nuclear power plant, preventive maintenance items are not only related to the maintenance object, but also to the environment in which the maintenance object is located. Each preventive maintenance item corresponds to a fixed environment, so the environmental correction factor of each preventive maintenance item is also uniquely determined; the environment of the preventive maintenance items in a nuclear power plant can be divided into: inside the nuclear island, outside the conventional island, radiation protection control red zone, radiation protection control orange zone, radiation protection control orange zone, radiation protection control green zone, confined space, non-confined space, high temperature environment, non-high temperature environment, noise environment and non-noise environment. For example, the environment of a preventive maintenance item is: inside the nuclear island, confined space and high temperature environment, the maintenance object is the electric head, and its corresponding environmental correction factor is 0.8. The environment of another preventive maintenance item is: outside the conventional island, non-confined space and high temperature environment, the maintenance object is the electric head, and the corresponding environmental correction factor is 0.7.

[0091] The method provided by the embodiment of the present invention determines the standard duration of each preventive maintenance item through the environmental correction coefficient corresponding to each preventive maintenance item, thereby improving the accuracy of the standard duration of each preventive maintenance item.

[0092] In combination with the content of the above embodiments, in one embodiment, judging whether it is necessary to modify the standard duration of each preventive maintenance item and the actual duration set of each preventive maintenance item includes:

[0093] 601. Determine a preset quantity value corresponding to each preventive maintenance item, where the preset quantity value is used to determine whether the standard duration of each preventive maintenance item needs to be modified;

[0094] 602. Determine a first actual construction period set and a second actual construction period set of each preventive maintenance project according to a standard construction period of each preventive maintenance project and an actual construction period set of each preventive maintenance project;

[0095] 603. Determine whether it is necessary to modify the standard duration of the corresponding preventive maintenance item according to the preset quantity value corresponding to each preventive maintenance item and the first actual duration set and the second actual duration set of each preventive maintenance item.

[0096] In the above step 601, the preset quantity value corresponding to each preventive maintenance item is not specifically limited in the embodiment of the present invention, and the preset quantity values ​​corresponding to different preventive maintenance items may be the same or different.

[0097] In the above step 602, the duration corresponding to each actual construction period in the first actual construction period set of each preventive maintenance project is greater than the standard construction period of the corresponding preventive maintenance project; the duration corresponding to each actual construction period in the second actual construction period set of each preventive maintenance project is less than the standard construction period of the corresponding preventive maintenance project.

[0098] Specifically, the number of actual durations in the first actual duration set or the second actual duration set of each preventive maintenance project may be 0. When the number of actual durations in the first actual duration set and the second actual duration set is 0, the standard duration of the corresponding preventive maintenance project does not need to be modified.

[0099] The method provided in the embodiment of the present invention can determine whether the standard duration of the corresponding preventive maintenance project needs to be modified through the preset quantity value corresponding to each preventive maintenance project and the actual duration set of each preventive maintenance project, thereby improving the accuracy of the standard duration in the SAP system and further improving the maintenance efficiency of the staff.

[0100] In combination with the content of the above embodiments, in one embodiment, according to the standard duration of each preventive maintenance item and the actual duration set of each preventive maintenance item, determining the first actual duration set and the second actual duration set of each preventive maintenance item includes:

[0101] 701. Determine a first difference threshold and a second difference threshold for each preventive maintenance item;

[0102] 702. The actual durations of the actual duration set of each preventive maintenance project that meet the first preset condition are taken as the first actual duration set of each preventive maintenance project, wherein the first preset condition includes that the actual durations in the actual duration set are greater than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than a first difference threshold;

[0103] 703. The actual duration of each preventive maintenance project that meets the second preset condition is collected as the second actual duration set. The second preset condition includes that the actual duration in the actual duration set is less than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than the second difference threshold.

[0104] In the above step 701, the first difference threshold and the second difference threshold of each preventive maintenance item are used to determine whether the standard duration of the corresponding preventive maintenance item needs to be modified.

[0105] Specifically, each time a worker completes a preventive maintenance project, the SAP system will record the actual duration of the project, compare the actual duration with the corresponding standard duration, and determine the difference between the two durations, and then determine whether the actual duration belongs to the first actual duration set or the second actual duration set. For example, if the first difference threshold is 30 minutes, the actual duration of a worker completing a preventive maintenance project is 5 hours, and the standard duration of the preventive maintenance project is 4 hours; then the actual duration of the preventive maintenance project belongs to the first actual duration set of the preventive maintenance project.

[0106] The method provided by the embodiment of the present invention can classify each actual duration of each preventive maintenance item by comparing each actual duration of each preventive maintenance item with the standard duration of each preventive maintenance item, the first difference threshold and the second difference threshold.

[0107] In combination with the content of the above embodiments, in one embodiment, judging whether it is necessary to modify the standard duration of the corresponding preventive maintenance item according to the preset quantity value corresponding to each preventive maintenance item, and the first actual duration set and the second actual duration set of each preventive maintenance item, includes:

[0108] If the number of actual durations in the first actual duration set or the second actual duration set in any preventive maintenance project is not less than the preset number value, the standard duration of the corresponding preventive maintenance project needs to be modified.

[0109] Specifically, the preset quantity value of each preventive maintenance item is set according to the number of actual durations in the corresponding actual duration set. For example, if the actual duration set of any preventive maintenance item includes 10 actual durations, the preset quantity of the corresponding preventive maintenance item can be set to 3; if the actual duration set of any preventive maintenance item includes 15 actual durations, the preset quantity of the corresponding preventive maintenance item can be set to 5.

[0110] If the number of actual durations in the first actual duration set or the second actual duration set in any preventive maintenance project is less than a preset number value, the standard duration of the corresponding preventive maintenance project does not need to be modified.

[0111] The method provided in the embodiment of the present invention can provide feedback and update the standard cycle of each preventive maintenance project through the current maintenance cycle of each preventive maintenance project and the actual duration of multiple maintenance cycles before the current maintenance cycle, thereby realizing closed-loop control of the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project.

[0112] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0113] Based on the same inventive concept, the embodiment of the present application also provides a nuclear power plant preventive maintenance project duration control device for implementing the above-mentioned nuclear power plant preventive maintenance project duration control method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in one or more embodiments of the nuclear power plant preventive maintenance project duration control device provided below can refer to the limitations of the nuclear power plant preventive maintenance project duration control method in the above text, and will not be repeated here.

[0114] In one embodiment, Figure 3 As shown, a device for controlling the construction period of a preventive maintenance project in a nuclear power plant is provided, comprising: an acquisition module 301, a first determination module 302, a second determination module 303, a third determination module 304 and a judgment module 305, wherein:

[0115] The acquisition module 301 is used to acquire each historical duration of each preventive maintenance project of the nuclear power plant in the historical time period. The historical duration refers to the time taken by the staff to repair each project in the historical time period. Each preventive maintenance project has a corresponding maintenance cycle.

[0116] The first determination module 302 is used to determine the average standard duration of each preventive maintenance project according to each historical duration of each preventive maintenance project;

[0117] The second determination module 303 is used to determine the standard duration of each preventive maintenance project according to the average standard duration of each preventive maintenance project;

[0118] The third determining module 304 is used to determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as the actual duration set of each preventive maintenance item;

[0119] The judgment module 305 is used to judge whether the standard duration of each preventive maintenance item needs to be modified according to the standard duration of each preventive maintenance item and the actual duration set of each preventive maintenance item.

[0120] In one embodiment, the acquisition module 301 includes:

[0121] The first determination unit is used to determine the time when the staff of each preventive maintenance project of the nuclear power plant in each maintenance cycle receives the work permit and the time when the work permit is returned in each maintenance cycle within the historical time period; the interval between the time when the work permit is received and the time when the work permit is returned is used as the historical duration of each preventive maintenance project in the corresponding maintenance cycle.

[0122] In one embodiment, the first determining module 302 includes:

[0123] The second determining unit is used to determine all historical construction periods of each preventive maintenance project of the nuclear power plant in the historical time period, except for the shortest historical construction period and the longest historical construction period, as the historical construction period set of each preventive maintenance project;

[0124] The calculation unit is used to calculate the average value of the historical duration set of each preventive maintenance project as the average standard duration of each preventive maintenance project.

[0125] In one embodiment, the second determining module 303 includes:

[0126] The third determination unit is used to determine the environmental correction coefficient of each preventive maintenance item; the product of the environmental correction coefficient of each preventive maintenance item and the average standard duration of the corresponding preventive maintenance item is used as the standard duration of the corresponding preventive maintenance item.

[0127] In one embodiment, the determination module 305 includes:

[0128] A fourth determination unit is used to determine a preset quantity value corresponding to each preventive maintenance item, wherein the preset quantity value is used to determine whether the standard duration of each preventive maintenance item needs to be modified;

[0129] A fifth determining unit, configured to determine a first actual duration set and a second actual duration set of each preventive maintenance item according to a standard duration of each preventive maintenance item and an actual duration set of each preventive maintenance item;

[0130] The judging unit is used to judge whether it is necessary to modify the standard duration of the corresponding preventive maintenance item according to the preset quantity value corresponding to each preventive maintenance item, and the first actual duration set and the second actual duration set of each preventive maintenance item.

[0131] In one embodiment, the fifth determining unit includes:

[0132] A determination subunit, used to determine a first difference threshold and a second difference threshold for each preventive maintenance item;

[0133] a first comparison subunit, configured to collect the actual durations of the actual duration of each preventive maintenance project that meet a first preset condition as a first actual duration set of each preventive maintenance project, wherein the first preset condition includes that the actual durations in the actual duration set are greater than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than a first difference threshold;

[0134] The second comparison subunit is used to collect the actual duration of each preventive maintenance project that meets the second preset condition as the second actual duration set, wherein the second preset condition includes that the actual duration in the actual duration set is less than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than the second difference threshold.

[0135] In one embodiment, the judging unit includes:

[0136] The modification subunit is used to modify the standard duration of the corresponding preventive maintenance project if the number of actual durations in the first actual duration set or the second actual duration set in any preventive maintenance project is not less than a preset number value.

[0137] Each module in the above-mentioned nuclear power plant preventive maintenance project duration control device can be implemented in whole or in part by software, hardware and their combination. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0138] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for controlling the construction period of a preventive maintenance project in a nuclear power plant is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0139] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0140] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0141] Obtain each historical duration of each preventive maintenance project of the nuclear power plant in the historical time period. The historical duration refers to the time taken by the staff to repair each project in the historical time period. Each preventive maintenance project has a corresponding maintenance cycle.

[0142] Determine the average standard duration of each preventive maintenance project based on each historical duration of each preventive maintenance project;

[0143] Determine the standard duration of each preventive maintenance project based on the average standard duration of each preventive maintenance project;

[0144] Determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as the actual duration set of each preventive maintenance item;

[0145] According to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project, it is determined whether the standard duration of the corresponding preventive maintenance project needs to be modified.

[0146] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0147] Determine the time when the staff of each preventive maintenance project of the nuclear power plant in each maintenance cycle receives the work permit and the time when the work permit is returned;

[0148] The interval between the time of obtaining the work permit and the time of returning the work permit is taken as the historical duration of each preventive maintenance project in the corresponding maintenance cycle.

[0149] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0150] Determine all historical construction periods of each preventive maintenance project of the nuclear power plant in the historical time period, except for the shortest historical construction period and the longest historical construction period, as the historical construction period set of each preventive maintenance project;

[0151] Calculate the average of the historical duration set of each preventive maintenance project as the average standard duration of each preventive maintenance project.

[0152] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0153] Determine the environmental correction factor for each preventive maintenance item;

[0154] The product of the environmental correction coefficient of each preventive maintenance item and the average standard construction period of the corresponding preventive maintenance item is taken as the standard construction period of the corresponding preventive maintenance item.

[0155] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0156] Determine a preset quantity value corresponding to each preventive maintenance item, wherein the preset quantity value is used to determine whether the standard duration of each preventive maintenance item needs to be modified;

[0157] Determine a first actual duration set and a second actual duration set of each preventive maintenance project according to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project;

[0158] According to the preset quantity value corresponding to each preventive maintenance item, and the first actual duration set and the second actual duration set of each preventive maintenance item, it is determined whether the standard duration of the corresponding preventive maintenance item needs to be modified.

[0159] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0160] Determining a first difference threshold and a second difference threshold for each preventive maintenance item;

[0161] The actual duration of each preventive maintenance project that meets the first preset condition in the actual duration set is used as the first actual duration set of each preventive maintenance project, wherein the first preset condition includes that the actual duration in the actual duration set is greater than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than a first difference threshold;

[0162] The actual construction period of each preventive maintenance project that meets the second preset condition is collected as the second actual construction period set, wherein the second preset condition includes that the actual construction period in the actual construction period set is less than the standard construction period of the corresponding preventive maintenance project, and the difference between the actual construction period of each preventive maintenance project and the standard construction period of the corresponding preventive maintenance project is greater than the second difference threshold.

[0163] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0164] If the number of actual durations in the first actual duration set or the second actual duration set in any preventive maintenance project is not less than the preset number value, the standard duration of the corresponding preventive maintenance project needs to be modified.

[0165] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0166] Determine the average standard duration of each preventive maintenance project based on each historical duration of each preventive maintenance project;

[0167] Determine the standard duration of each preventive maintenance project based on the average standard duration of each preventive maintenance project;

[0168] Determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as the actual duration set of each preventive maintenance item;

[0169] According to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project, it is determined whether the standard duration of the corresponding preventive maintenance project needs to be modified.

[0170] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0171] Determine the time when the staff of each preventive maintenance project of the nuclear power plant in each maintenance cycle receives the work permit and the time when the work permit is returned;

[0172] The interval between the time of obtaining the work permit and the time of returning the work permit is taken as the historical duration of each preventive maintenance project in the corresponding maintenance cycle.

[0173] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0174] Determine all historical construction periods of each preventive maintenance project of the nuclear power plant in the historical time period, except for the shortest historical construction period and the longest historical construction period, as the historical construction period set of each preventive maintenance project;

[0175] Calculate the average of the historical duration set of each preventive maintenance project as the average standard duration of each preventive maintenance project.

[0176] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0177] Determine the environmental correction factor for each preventive maintenance item;

[0178] The product of the environmental correction coefficient of each preventive maintenance item and the average standard construction period of the corresponding preventive maintenance item is taken as the standard construction period of the corresponding preventive maintenance item.

[0179] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0180] Determine a preset quantity value corresponding to each preventive maintenance item, wherein the preset quantity value is used to determine whether the standard duration of each preventive maintenance item needs to be modified;

[0181] Determine a first actual duration set and a second actual duration set of each preventive maintenance project according to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project;

[0182] According to the preset quantity value corresponding to each preventive maintenance item, and the first actual duration set and the second actual duration set of each preventive maintenance item, it is determined whether the standard duration of the corresponding preventive maintenance item needs to be modified.

[0183] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0184] Determining a first difference threshold and a second difference threshold for each preventive maintenance item;

[0185] The actual duration of each preventive maintenance project that meets the first preset condition in the actual duration set is used as the first actual duration set of each preventive maintenance project, wherein the first preset condition includes that the actual duration in the actual duration set is greater than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than a first difference threshold;

[0186] The actual duration of each preventive maintenance project that meets the second preset condition is collected as the second actual duration set, wherein the second preset condition includes that the actual duration in the actual duration set is less than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than the second difference threshold.

[0187] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0188] If the number of actual durations in the first actual duration set or the second actual duration set in any preventive maintenance project is not less than the preset number value, the standard duration of the corresponding preventive maintenance project needs to be modified.

[0189] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0190] Obtain each historical duration of each preventive maintenance project of the nuclear power plant in the historical time period. The historical duration refers to the time taken by the staff to repair each project in the historical time period. Each preventive maintenance project has a corresponding maintenance cycle.

[0191] Determine the average standard duration of each preventive maintenance project based on each historical duration of each preventive maintenance project;

[0192] Determine the standard duration of each preventive maintenance project based on the average standard duration of each preventive maintenance project;

[0193] Determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as the actual duration set of each preventive maintenance item;

[0194] According to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project, it is determined whether the standard duration of the corresponding preventive maintenance project needs to be modified.

[0195] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0196] Determine the time when the staff of each preventive maintenance project of the nuclear power plant in each maintenance cycle receives the work permit and the time when the work permit is returned;

[0197] The interval between the time of obtaining the work permit and the time of returning the work permit is taken as the historical duration of each preventive maintenance project in the corresponding maintenance cycle.

[0198] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0199] Determine all historical construction periods of each preventive maintenance project of the nuclear power plant in the historical time period, except for the shortest historical construction period and the longest historical construction period, as the historical construction period set of each preventive maintenance project;

[0200] Calculate the average of the historical duration set of each preventive maintenance project as the average standard duration of each preventive maintenance project.

[0201] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0202] Determine the environmental correction factor for each preventive maintenance item;

[0203] The product of the environmental correction coefficient of each preventive maintenance item and the average standard construction period of the corresponding preventive maintenance item is taken as the standard construction period of the corresponding preventive maintenance item.

[0204] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0205] Determine a preset quantity value corresponding to each preventive maintenance item, wherein the preset quantity value is used to determine whether the standard duration of each preventive maintenance item needs to be modified;

[0206] Determine a first actual duration set and a second actual duration set of each preventive maintenance project according to the standard duration of each preventive maintenance project and the actual duration set of each preventive maintenance project;

[0207] According to the preset quantity value corresponding to each preventive maintenance item, and the first actual duration set and the second actual duration set of each preventive maintenance item, it is determined whether the standard duration of the corresponding preventive maintenance item needs to be modified.

[0208] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0209] Determining a first difference threshold and a second difference threshold for each preventive maintenance item;

[0210] The actual duration of each preventive maintenance project that meets the first preset condition in the actual duration set is used as the first actual duration set of each preventive maintenance project, wherein the first preset condition includes that the actual duration in the actual duration set is greater than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than a first difference threshold;

[0211] The actual construction period of each preventive maintenance project that meets the second preset condition is collected as the second actual construction period set, wherein the second preset condition includes that the actual construction period in the actual construction period set is less than the standard construction period of the corresponding preventive maintenance project, and the difference between the actual construction period of each preventive maintenance project and the standard construction period of the corresponding preventive maintenance project is greater than the second difference threshold.

[0212] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0213] If the number of actual durations in the first actual duration set or the second actual duration set in any preventive maintenance project is not less than the preset number value, the standard duration of the corresponding preventive maintenance project needs to be modified.

[0214] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0215] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0216] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0217] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for controlling the construction period of a preventive maintenance project in a nuclear power plant, characterized in that: The method comprises: Obtain each historical duration of each preventive maintenance project of the nuclear power plant in the historical time period. The historical duration refers to the time taken by the staff to repair each project in the historical time period. Each preventive maintenance project has a corresponding maintenance cycle. Determine the average standard duration of each preventive maintenance project based on each historical duration of each preventive maintenance project; Determine the environmental correction coefficient for each preventive maintenance project; take the product of the environmental correction coefficient for each preventive maintenance project and the average standard construction period of the corresponding preventive maintenance project as the standard construction period of the corresponding preventive maintenance project; Determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as the actual duration set of each preventive maintenance item; Determine the preset quantity value corresponding to each preventive maintenance item; Determine a first difference threshold and a second difference threshold for each preventive maintenance project; collect the actual durations of each preventive maintenance project that meet a first preset condition as the first actual duration set of each preventive maintenance project, wherein the first preset condition includes that the actual durations in the actual duration set are greater than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than the first difference threshold; collect the actual durations of each preventive maintenance project that meet a second preset condition as the second actual duration set, wherein the second preset condition includes that the actual durations in the actual duration set are less than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than the second difference threshold; If the number of actual durations in the first actual duration set or the second actual duration set in any preventive maintenance project is not less than the preset number value, the standard duration of the corresponding preventive maintenance project needs to be modified.

2. The method according to claim 1, characterized in that The obtaining of each historical duration of each preventive maintenance project of the nuclear power plant during the historical time period includes: Determine the time when the staff of each preventive maintenance project of the nuclear power plant in each maintenance cycle receives the work permit and the time when the work permit is returned; The interval between the time of obtaining the work permit and the time of returning the work permit is used as the historical duration of each preventive maintenance item in the corresponding maintenance cycle.

3. The method according to claim 1, characterized in that The above-mentioned method of determining the average standard duration of each preventive maintenance project based on each historical duration of each preventive maintenance project includes: Determine all historical construction periods of each preventive maintenance project of the nuclear power plant in the historical time period, except for the shortest historical construction period and the longest historical construction period, as the historical construction period set of each preventive maintenance project; Calculate the average of the historical duration set of each preventive maintenance project as the average standard duration of each preventive maintenance project.

4. A nuclear power plant preventive maintenance project duration control device, characterized in that: The device comprises: An acquisition module is used to acquire each historical duration of each preventive maintenance project of the nuclear power plant in the historical time period. The historical duration refers to the time taken by the staff to repair each project in the historical time period. Each preventive maintenance project has a corresponding maintenance cycle; The first determination module is used to determine the average standard duration of each preventive maintenance project based on each historical duration of each preventive maintenance project; The second determination module is used to determine the environmental correction coefficient of each preventive maintenance project; the product of the environmental correction coefficient of each preventive maintenance project and the average standard construction period of the corresponding preventive maintenance project is used as the standard construction period of the corresponding preventive maintenance project; A third determination module is used to determine the actual duration of each preventive maintenance item in the corresponding current maintenance cycle, and the actual duration of each preventive maintenance item in a preset number of maintenance cycles before the corresponding current maintenance cycle and adjacent to the current maintenance cycle, as an actual duration set of each preventive maintenance item; The judgment module is used to determine the preset quantity value corresponding to each preventive maintenance project; determine the first difference threshold and the second difference threshold of each preventive maintenance project; collect the actual durations of each preventive maintenance project that meet the first preset condition as the first actual duration set of each preventive maintenance project, wherein the first preset condition includes that the actual duration in the actual duration set is greater than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than the first difference threshold; collect the actual durations of each preventive maintenance project that meet the second preset condition as the second actual duration set, wherein the second preset condition includes that the actual duration in the actual duration set is less than the standard duration of the corresponding preventive maintenance project, and the difference between the actual duration of each preventive maintenance project and the standard duration of the corresponding preventive maintenance project is greater than the second difference threshold; if the number of actual durations in the first actual duration set or the second actual duration set in any preventive maintenance project is not less than the preset quantity value, the standard duration of the corresponding preventive maintenance project needs to be modified.

5. The device according to claim 4, characterized in that The acquisition module comprises: The first determination unit is used to determine the time when the staff of each preventive maintenance project of the nuclear power plant in each maintenance cycle receives the work permit and the time when the work permit is returned in each maintenance cycle within the historical time period; the interval between the time when the work permit is received and the time when the work permit is returned is used as the historical duration of each preventive maintenance project in the corresponding maintenance cycle.

6. The device according to claim 4, characterized in that The first determining module includes: The second determining unit is used to determine all historical construction periods of each preventive maintenance project of the nuclear power plant in the historical time period, except for the shortest historical construction period and the longest historical construction period, as the historical construction period set of each preventive maintenance project; The calculation unit is used to calculate the average value of the historical duration set of each preventive maintenance project as the average standard duration of each preventive maintenance project.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 3 are implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 3 are implemented.

9. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 3 are implemented.

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