Reliability analysis method, device, equipment and storage medium for nuclear power plant units

Abstract

The present application relates to a reliability analysis method, apparatus, device, and storage medium for a nuclear power plant unit. The method comprises: obtaining a fault tree model for the nuclear power plant unit; obtaining operating status information of nuclear power equipment corresponding to the bottom event of the fault tree model; and, when the nuclear power equipment fails, performing layer-by-layer calculations on the fault tree model in a bottom-to-top order based on the actual failure data of the nuclear power equipment to obtain a power generation reliability index for the nuclear power plant unit. After certain nuclear power equipment fails, the method can quantitatively analyze the impact of the nuclear power equipment failure on the power generation reliability index of the nuclear power plant unit through the logical relationships between events provided by the fault tree model, thereby reducing the involvement of human factors, making the analysis results more objective, and thus improving the accuracy of the analysis results.

Description

Technical Field

[0001] The present application relates to the technical field of safety management of nuclear power plants, and in particular to a reliability analysis method, device, equipment and storage medium for a nuclear power plant unit. Background Art

[0002] The reliability of nuclear power plant units is a crucial indicator for the daily operation of nuclear power plants. Traditionally, qualitative methods have been used to estimate the impact of equipment failures on unit reliability. This lack of quantitative analysis and evaluation has resulted in low accuracy in the analysis results. Summary of the Invention

[0003] The present application provides a reliability analysis method, apparatus, equipment and storage medium for a nuclear power plant unit.

[0004] In a first aspect, an embodiment of the present application provides a reliability analysis method for a nuclear power plant unit, comprising:

[0005] Obtaining a fault tree model of the nuclear power plant unit;

[0006] Obtaining operating status information of nuclear power equipment corresponding to the bottom event of the fault tree model;

[0007] When the nuclear power equipment fails, the fault tree model is calculated layer by layer in order from the bottom layer to the top layer according to the actual failure data of the nuclear power equipment to obtain the power generation reliability index of the nuclear power plant unit.

[0008] In a second aspect, an embodiment of the present application provides a reliability analysis device for a nuclear power plant unit, comprising:

[0009] A first acquisition module is used to acquire a fault tree model of the nuclear power plant unit;

[0010] A second acquisition module is used to obtain the operating status information of the nuclear power equipment corresponding to the bottom event of the fault tree model;

[0011] The processing module is used to calculate the fault tree model layer by layer in order from the bottom layer to the top layer when the nuclear power equipment fails, based on the actual failure data of the nuclear power equipment, to obtain the power generation reliability index of the nuclear power plant unit.

[0012] In a third aspect, an embodiment of the present application provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the reliability analysis method for a nuclear power plant unit provided in the first aspect of the embodiment of the present application are implemented.

[0013] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the reliability analysis method for a nuclear power plant unit provided in the first aspect of the embodiment of the present application are implemented.

[0014] The technical solution provided by the embodiments of the present application obtains a fault tree model for a nuclear power plant unit and obtains the operating status information of the nuclear power equipment corresponding to the bottom events of the fault tree model. When a nuclear power equipment fails, the fault tree model is calculated layer by layer from the bottom to the top based on the actual failure data of the nuclear power equipment to obtain the power generation reliability index of the nuclear power plant unit. In other words, after the failure of certain nuclear power equipment, the logical relationship between the events provided by the fault tree model can be used to quantitatively analyze the impact of the nuclear power equipment failure on the power generation reliability index of the nuclear power plant unit, reducing the involvement of human factors, making the analysis results more objective, and thus improving the accuracy of the analysis results. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic flow chart of a reliability analysis method for a nuclear power plant unit provided in an embodiment of the present application;

[0016] Figure 2 A schematic diagram of a process for screening key nuclear power equipment provided in an embodiment of the present application;

[0017] Figure 3 A schematic structural diagram of a reliability analysis device for a nuclear power plant unit provided in an embodiment of the present application;

[0018] Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of this application more clear, the technical solutions in the embodiments of this application are further described in detail through the following embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain this application and are not used to limit this application.

[0020] It should be noted that the execution subject of the following method embodiment can be a reliability analysis device of a nuclear power plant unit, and the device can be implemented as part or all of an electronic device through software, hardware, or a combination of software and hardware. Optionally, the electronic device can be various types of devices, and the electronic device can exchange information with external devices. Optionally, the electronic device can be any one of a PDA (personal digital assistant), a PAD (tablet computer), a PMP (portable multimedia player), a vehicle-mounted terminal (such as a vehicle-mounted navigation terminal), a mobile phone, and a PC (personal computer). The following method embodiment is described by taking the execution subject as an electronic device as an example.

[0021] Figure 1 A flow chart of a reliability analysis method for a nuclear power plant unit provided in an embodiment of the present application. Figure 1 As shown, the method may include:

[0022] S101: Obtain a fault tree model of the nuclear power plant unit.

[0023] The fault tree model may include top events, intermediate events, and bottom events. Top events can be various fault phenomena of a nuclear power plant unit. Each top event corresponds to a fault tree, serving as the first node of the fault tree. For example, the top event of the fault tree model may be a reactor shutdown, a turbine shutdown, or a significant power reduction. Intermediate events are process nodes in the fault path of a nuclear power plant unit. For example, the intermediate event of the top event "reactor shutdown" may be a high bearing water temperature of reactor cooling pump 1A. Bottom events are the smallest components that cause various fault phenomena in the nuclear power plant unit, that is, the basic components that fail and cannot be further expanded in the fault tree. They serve as the tail node of the fault tree. For example, the bottom event of the intermediate event "high bearing water temperature of reactor cooling pump 1A" may be a mechanical failure of the main pump or a temperature sensor failure.

[0024] In practical applications, a fault tree model for a nuclear power plant unit can be pre-built. Specifically, the top event, intermediate events, and tail events of the fault tree model are constructed, and the fault tree model for the nuclear power plant unit is formed according to the logical relationships between faults. For example, taking the top event "reactor shutdown" as an example, a fault tree model for a nuclear power plant reactor shutdown can be drawn by combining automatic and manual shutdown logic and failure mode analysis.

[0025] Generally speaking, all nodes in a fault tree model are faults, and faults occurring at child nodes are the cause of faults occurring at the parent node. The logic gates between a parent node and child nodes may include, but are not limited to, AND gates, OR gates, NOT gates, and NAND gates. For example, an AND gate is defined as a parent node that fails only when the devices corresponding to all child nodes fail. An OR gate is defined as a parent node that fails when the device corresponding to at least one child node fails. A NOT gate is defined as a gate that indicates that a parent node fails only when the devices corresponding to the child nodes do not fail. The NAND gate functions like a combination of an AND gate and a NOT gate, indicating that a parent node fails only when at least one of the child nodes does not fail.

[0026] S102: Obtain operating status information of nuclear power equipment corresponding to the bottom event of the fault tree model.

[0027] The operating status information is used to indicate whether the nuclear power equipment is operating normally. Specifically, it is necessary to determine whether the nuclear power equipment has experienced a fault or is undergoing preventive maintenance. When a nuclear power equipment has experienced a fault or is undergoing preventive maintenance, the nuclear power equipment can be determined to be faulty. In practical applications, whether the nuclear power equipment is undergoing preventive maintenance can be determined based on pre-set maintenance plan information.

[0028] S103. When the nuclear power equipment fails, the fault tree model is calculated layer by layer in order from the bottom layer to the top layer according to actual failure data of the nuclear power equipment to obtain a power generation reliability index of the nuclear power plant unit.

[0029] Optionally, the power generation reliability index may include reactor shutdown risk, turbine shutdown risk, and / or risk of power reduction exceeding a preset ratio. Of course, other risks used to characterize nuclear power plant unit failures may also be included.

[0030] When determining a nuclear power equipment failure based on its operating status, the fault tree model can be used to calculate the probability of a nuclear power equipment failure leading to a top-level event in the nuclear power plant unit, based on the actual failure data of the nuclear power equipment and the logical relationships provided by the fault tree model. This method can be used to determine the probability of a nuclear power equipment failure leading to a top-level event in the nuclear power plant unit, thereby obtaining the power generation reliability index of the nuclear power plant unit. For example, after a nuclear power equipment failure, the shutdown risk value of the nuclear power plant unit can be calculated based on the actual failure data of the nuclear power equipment and the logical relationships provided by the fault tree model. This method can determine the impact of the nuclear power equipment failure on the nuclear power plant unit, providing a basis for subsequent maintenance decisions.

[0031] In practical applications, there may be a situation where, for example, a set of events that causes a power reduction greater than 10% also has a certain impact on the turbine shutdown. At this time, in order to improve the accuracy of the power generation reliability index of the determined nuclear power plant unit, in the process of calculating the power generation reliability index, it is necessary to remove the redundant bottom events in the fault tree model to avoid repeated calculation of the same bottom event.

[0032] In one embodiment, when the power generation reliability index exceeds a preset threshold, the nuclear power equipment information is highlighted. Specifically, the nuclear power equipment information can be highlighted on the current interface or output via voice broadcast to remind maintenance personnel to pay special attention to the nuclear power equipment.

[0033] After a nuclear power equipment fails, the impact of the nuclear power equipment failure on the failure risk of the nuclear power plant unit can be determined through the logical relationship between the actual failure data of the nuclear power equipment and the events provided by the fault tree model. This can facilitate preventive maintenance, the formulation of condition monitoring strategies, the determination of nuclear power equipment maintenance windows, the formulation of maintenance plans, the decision-making on system and equipment changes and modifications, and provide a basis for decision-making on whether to enter overhaul in advance when important equipment is degraded.

[0034] The reliability analysis method for a nuclear power plant unit provided in an embodiment of the present application obtains a fault tree model for the nuclear power plant unit and the operating status of the nuclear power equipment corresponding to the bottom event of the fault tree model. When a nuclear power equipment fails, the fault tree model is calculated layer by layer from the bottom to the top based on the actual failure data of the nuclear power equipment to obtain the power generation reliability index of the nuclear power plant unit. In other words, after certain nuclear power equipment fails, the logical relationship between the events provided by the fault tree model can be used to quantitatively analyze the impact of the nuclear power equipment failure on the power generation reliability index of the nuclear power plant unit, thereby reducing the involvement of human factors, making the analysis results more objective, and thus improving the accuracy of the analysis results.

[0035] In one embodiment, optionally, the power generation reliability index may be analyzed according to a preset quantification strategy to determine whether the deviation between the power generation reliability index and the quantification index exceeds a preset range; if so, the fault tree model is modified.

[0036] The quantitative strategy includes at least one of the following parameters: industry experience feedback information and a probabilistic risk assessment model.

[0037] That is to say, in order to further improve the accuracy of the reliability analysis results of nuclear power plant units, the power generation reliability index calculated by the fault tree model can also be compared with the industry experience feedback information or the evaluation result information fed back by the probabilistic risk assessment model. If the two have a large deviation, the logic of the fault tree model or the initial failure probability of each bottom event in the fault tree model can be corrected based on the historical fault records of the nuclear power plant units to make the fault tree model more consistent with the actual operation of the nuclear power plant. Among them, the above-mentioned quantitative indicators can be the evaluation result information fed back by the industry experience feedback information or the probabilistic risk assessment model. Subsequently, the reliability of the nuclear power plant units can be analyzed based on the corrected fault tree model.

[0038] In this embodiment, the calculated power generation reliability index can also be analyzed through a preset quantification strategy, and the fault tree model of the nuclear power plant unit can be corrected based on the analysis results, so that the fault tree model is more consistent with the actual operation of the nuclear power plant, thereby further improving the accuracy of the reliability analysis results of the nuclear power plant unit after the failure of nuclear power equipment.

[0039] In one embodiment, key nuclear power equipment that has a greater impact on the power generation reliability index of the nuclear power plant unit can also be screened out for key monitoring to ensure the normal operation of the nuclear power plant unit. To this end, optionally, based on the above embodiment, as Figure 2 As shown, the method may further include:

[0040] S201: Determine the importance of each bottom event in the fault tree model.

[0041] The importance is used to characterize the degree of impact on the power generation reliability index of the nuclear power plant unit. There are many bottom events in the fault tree model, but not all bottom events significantly impact the top event of the fault tree model. In other words, some bottom events have a significant impact on the power generation reliability index of the nuclear power plant unit, while others have a smaller impact. In this embodiment, it is necessary to focus on the bottom events that have a significant impact on the power generation reliability index of the nuclear power plant unit.

[0042] Specifically, first, the initial failure probability of each bottom event in the fault tree model is obtained. In the embodiment of the present application, an initial failure probability can be assigned to each bottom event based on expert experience and the probability of failure.

[0043] Next, historical failure records are obtained. Based on these historical failure records, the number of occurrences of each basic event is counted. Based on the number of occurrences of each basic event, a modified failure probability for each basic event is determined. For any basic event, its modified failure probability should be positively correlated with its number of occurrences. That is, the more times a basic event occurs, the greater its modified failure probability. Conversely, the fewer times a basic event occurs, the smaller its modified failure probability.

[0044] Next, the target failure probability for each base event is determined based on the initial and revised failure probabilities of each base event. The target failure probability for each base event can be determined by multiplying the initial and revised failure probabilities. Alternatively, the revised failure probability can be used to update the initial failure probability to obtain the target failure probability for each base event.

[0045] Furthermore, based on the target failure probability of each bottom event, the fault tree model is calculated layer by layer, from the bottom layer to the top layer, to obtain the importance of each bottom event. After obtaining the target failure probability of each bottom event, the impact of each bottom event on the top event can be calculated in sequence according to the logical relationship provided by the fault tree model, thereby obtaining the importance of each bottom event.

[0046] S202: Determine a target bottom event from each bottom event according to each importance.

[0047] Target bottom events are bottom events that significantly impact the power generation reliability indicators of nuclear power plant units. After determining the importance of each bottom event, bottom events with an importance greater than or equal to a preset value can be identified as target bottom events. Alternatively, the bottom events can be ranked according to their importance, and the target bottom events determined based on the ranking results.

[0048] S203: Output information of key nuclear power equipment corresponding to the target bottom event.

[0049] After determining the target bottom event, the nuclear power equipment corresponding to the target bottom event can be identified as key nuclear power equipment, and the information of the key nuclear power equipment can be output. Since the failure of key nuclear power equipment has a significant impact on the power generation reliability index of the nuclear power plant unit, it is necessary to focus on monitoring the key nuclear power equipment.

[0050] Furthermore, by focusing on key nuclear power equipment, if a fault is detected, the system can search for corresponding solution information from a pre-set database and send the solution information to the terminal device where the maintenance personnel are located. In this way, the maintenance personnel can then handle the fault of the key nuclear power equipment according to the solution information.

[0051] In this embodiment, the importance of each bottom event in the fault tree model can be determined, and based on each importance, the target bottom event can be determined from each bottom event, and the information of the key nuclear power equipment corresponding to the target bottom event can be output, so as to obtain the key nuclear power equipment that has a greater impact on the power generation reliability index of the nuclear power plant unit, and then focus on monitoring the key nuclear power equipment to ensure the normal operation of the nuclear power plant unit and effectively eliminate safety hazards.

[0052] Figure 3 A schematic diagram of a structure of a reliability analysis device for a nuclear power plant unit provided in an embodiment of the present application. Figure 3 As shown, the device may include: a first acquisition module 301 , a second acquisition module 302 and a processing module 303 .

[0053] Specifically, the first acquisition module 301 is used to acquire the fault tree model of the nuclear power plant unit;

[0054] The second acquisition module 302 is used to obtain the operating status information of the nuclear power equipment corresponding to the bottom event of the fault tree model;

[0055] The processing module 303 is used to calculate the fault tree model layer by layer from the bottom to the top according to the actual failure data of the nuclear power equipment when the nuclear power equipment fails, so as to obtain the power generation reliability index of the nuclear power plant unit.

[0056] The reliability analysis device for a nuclear power plant unit provided in an embodiment of the present application obtains a fault tree model for the nuclear power plant unit and obtains operating status information of the nuclear power equipment corresponding to the bottom event of the fault tree model. When a nuclear power equipment fails, the fault tree model is calculated layer by layer in a descending order based on the actual failure data of the nuclear power equipment to obtain the power generation reliability index of the nuclear power plant unit. In other words, after certain nuclear power equipment fails, the logical relationship between the events provided by the fault tree model can be used to quantitatively analyze the impact of the nuclear power equipment failure on the power generation reliability index of the nuclear power plant unit, thereby reducing the involvement of human factors, making the analysis results more objective, and thus improving the accuracy of the analysis results.

[0057] Optionally, the power generation reliability index includes a reactor shutdown risk, a turbine shutdown risk, and / or a power reduction risk causing an amplitude exceeding a preset ratio.

[0058] Based on the above embodiment, optionally, the device further includes: a first determination module, a second determination module and an output module.

[0059] Specifically, the first determination module is used to determine the importance of each bottom event in the fault tree model; wherein the importance is used to represent the degree of influence on the power generation reliability index of the nuclear power plant unit;

[0060] The second determining module is used to determine the target bottom event from each bottom event according to each importance;

[0061] The output module is used to output the information of key nuclear power equipment corresponding to the target bottom event.

[0062] Based on the above embodiment, optionally, the first determination module is specifically used to obtain the initial failure probability of each bottom event in the fault tree model; obtain historical failure records, count the number of occurrences of each bottom event based on the historical failure records, and determine the corrected failure probability of each bottom event according to the number of occurrences of each bottom event; determine the target failure probability of each bottom event according to the initial failure probability and the corrected failure probability of each bottom event; and calculate the fault tree model layer by layer in order from the bottom layer to the top layer according to the target failure probability of each bottom event to obtain the importance of each bottom event.

[0063] Based on the above embodiment, optionally, the device further includes: a search module.

[0064] Specifically, the search module is used to monitor the key nuclear power equipment, and when a failure occurs in the key nuclear power equipment, search for solution information corresponding to the failure from a preset database, and send the solution information to the terminal device where the maintenance personnel are located.

[0065] Based on the above embodiment, optionally, the device further includes: a quantitative analysis module and a correction module.

[0066] Specifically, the quantitative analysis module is used to analyze the power generation reliability index according to a preset quantitative strategy to determine whether the deviation between the power generation reliability index and the quantitative index exceeds a preset range;

[0067] The correction module is used to correct the fault tree model when the quantitative analysis module determines that the deviation between the power generation reliability index and the quantitative index exceeds a preset range;

[0068] The quantitative strategy includes at least one of the following parameters: industry experience feedback information and a probabilistic risk assessment model.

[0069] Based on the above embodiment, optionally, the device further includes: a display module.

[0070] Specifically, the display module is used to highlight the information of the nuclear power equipment when the power generation reliability index exceeds a preset threshold.

[0071] In one embodiment, an electronic device is provided, whose internal structure diagram can be as follows: Figure 4As shown. The electronic device includes a processor, a memory, a network interface and a database connected via a system bus. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The network interface of the electronic device is used to communicate with an external terminal via a network connection. The database of the electronic device is used to store data involved in the reliability analysis process of a nuclear power plant unit. When the computer program is executed by the processor, a reliability analysis method for a nuclear power plant unit is implemented.

[0072] 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 electronic device to which the solution of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0073] In one embodiment, an electronic 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:

[0074] Obtaining a fault tree model of the nuclear power plant unit;

[0075] Obtaining operating status information of nuclear power equipment corresponding to the bottom event of the fault tree model;

[0076] When the nuclear power equipment fails, the fault tree model is calculated layer by layer in order from the bottom layer to the top layer according to the actual failure data of the nuclear power equipment to obtain the power generation reliability index of the nuclear power plant unit.

[0077] Optionally, the power generation reliability index includes a reactor shutdown risk, a turbine shutdown risk, and / or a power reduction risk causing an amplitude exceeding a preset ratio.

[0078] In one embodiment, when the processor executes the computer program, the following steps are further implemented: determining the importance of each bottom event in the fault tree model; wherein the importance is used to characterize the degree of influence on the power generation reliability index of the nuclear power plant unit; determining a target bottom event from each bottom event according to each importance; and outputting information of key nuclear power equipment corresponding to the target bottom event.

[0079] In one embodiment, when the processor executes the computer program, the following steps are further implemented: obtaining an initial failure probability of each bottom event in the fault tree model; obtaining historical failure records, counting the number of occurrences of each bottom event based on the historical failure records, and determining a revised failure probability of each bottom event based on the number of occurrences of each bottom event; determining a target failure probability of each bottom event based on the initial failure probability and the revised failure probability of each bottom event; and calculating the fault tree model layer by layer in order from the bottom layer to the top layer based on the target failure probability of each bottom event to obtain the importance of each bottom event.

[0080] In one embodiment, when the processor executes the computer program, it also implements the following steps: monitoring the key nuclear power equipment, and when a failure occurs in the key nuclear power equipment, searching for solution information corresponding to the failure from a preset database, and sending the solution information to the terminal device where the maintenance personnel is located.

[0081] In one embodiment, when the processor executes the computer program, the following steps are further implemented: analyzing the power generation reliability index according to a preset quantification strategy to determine whether the deviation between the power generation reliability index and the quantification index exceeds a preset range; if so, correcting the fault tree model; wherein the quantification strategy includes at least one of the following parameters: industry experience feedback information and a probabilistic risk assessment model.

[0082] In one embodiment, when the processor executes the computer program, the following steps are further implemented: when the power generation reliability index exceeds a preset threshold, the information of the nuclear power equipment is highlighted.

[0083] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0084] Obtaining a fault tree model of the nuclear power plant unit;

[0085] Obtaining operating status information of nuclear power equipment corresponding to the bottom event of the fault tree model;

[0086] When the nuclear power equipment fails, the fault tree model is calculated layer by layer in order from the bottom layer to the top layer according to the actual failure data of the nuclear power equipment to obtain the power generation reliability index of the nuclear power plant unit.

[0087] The reliability analysis apparatus, device, and storage medium for a nuclear power plant unit provided in the above embodiments can execute the reliability analysis method for a nuclear power plant unit provided in any embodiment of the present application, and have the corresponding functional modules and beneficial effects of executing the method. For technical details not fully described in the above embodiments, please refer to the reliability analysis method for a nuclear power plant unit provided in any embodiment of the present application.

[0088] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0089] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A reliability analysis method for a nuclear power plant unit, characterized in that: include: Obtaining a fault tree model of the nuclear power plant unit; Obtaining operating status information of nuclear power equipment corresponding to the bottom event of the fault tree model; When the nuclear power equipment fails, the fault tree model is calculated layer by layer in order from the bottom layer to the top layer according to the actual failure data of the nuclear power equipment to obtain the power generation reliability index of the nuclear power plant unit; Setting an initial failure probability for each bottom event in the fault tree model according to expert experience and the probability of failure; Obtaining historical failure records, counting the number of occurrences of each basic event based on the historical failure records, and determining a corrected failure probability of each basic event according to the number of occurrences of each basic event; Determine the target failure probability of each bottom event based on the product of the initial failure probability and the revised failure probability of each bottom event; According to the target failure probability of each bottom event, the fault tree model is calculated layer by layer in the order from the bottom to the top to obtain the importance of each bottom event; According to the importance of each level, determine the target bottom event from each bottom event; Outputting information of key nuclear power equipment corresponding to the target bottom event; The key nuclear power equipment is monitored, and when a fault occurs in the key nuclear power equipment, solution information corresponding to the fault is searched from a preset database, and the solution information is sent to a terminal device where a maintenance personnel is located.

2. The method according to claim 1, characterized in that The power generation reliability index includes reactor shutdown risk, turbine shutdown risk and / or power reduction risk causing an amplitude exceeding a preset ratio.

3. The method according to any one of claims 1 to 2, characterized in that Also includes: Analyzing the power generation reliability index according to a preset quantification strategy to determine whether a deviation between the power generation reliability index and the quantification index exceeds a preset range; If so, the fault tree model is modified; The quantitative strategy includes at least one of the following parameters: industry experience feedback information and a probabilistic risk assessment model.

4. The method according to claim 1, wherein Also includes: When the power generation reliability index exceeds a preset threshold, the information of the nuclear power equipment is highlighted.

5. A reliability analysis device for a nuclear power plant unit, characterized in that: include: A first acquisition module is used to acquire a fault tree model of the nuclear power plant unit; A second acquisition module is used to obtain the operating status information of the nuclear power equipment corresponding to the bottom event of the fault tree model; a processing module configured to calculate the fault tree model layer by layer in order from the bottom layer to the top layer when the nuclear power equipment fails, based on actual failure data of the nuclear power equipment, to obtain a power generation reliability index of the nuclear power plant unit; A first determination module is configured to set an initial failure probability for each bottom event in the fault tree model based on expert experience and the probability of failure, obtain historical failure records, count the number of occurrences of each bottom event based on the historical failure records, and determine a revised failure probability for each bottom event based on the number of occurrences of each bottom event; determine a target failure probability for each bottom event based on the product of the initial failure probability and the revised failure probability of each bottom event; and perform layer-by-layer calculations on the fault tree model from the bottom layer to the top layer based on the target failure probability of each bottom event to obtain the importance of each bottom event; A second determining module is used to determine a target bottom event from each bottom event according to each importance; An output module, configured to output information of key nuclear power equipment corresponding to the target bottom event; The search module is used to monitor the key nuclear power equipment, and when a failure occurs in the key nuclear power equipment, search for solution information corresponding to the failure from a preset database, and send the solution information to the terminal device where the maintenance personnel are located.

6. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

7. 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 4 are implemented.

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