Method and system for inspecting nuclear power plant building

Abstract

The application discloses a nuclear power plant room inspection method and system. The method comprises the following steps: S10, generating a risk guidance map according to plant three-dimensional data and a risk database; S20, formulating an inspection task execution strategy according to the risk guidance map and performance parameters of an inspection device; S30, executing the inspection task execution strategy to obtain an inspection result; S40, performing safety risk analysis on the inspection result to obtain a safety analysis result, and updating the safety analysis result to the risk database; and S50, judging whether the updated risk database will affect the formulation of the inspection task execution strategy, returning to S10 if yes, and returning to S20 if no. The application replaces workers to perform the inspection on the nuclear power plant by controlling the inspection device, realizes the accurate inspection on the nuclear power plant, reduces the risk of personnel injury, analyzes the inspection result, dynamically updates the object or task target that needs to be inspected, avoids the over-inspection and insufficient-inspection situation, and improves the accuracy and effect of the inspection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power safety inspection, and in particular to a nuclear power plant inspection method and system. BACKGROUND

[0002] There are a large number of complex plant buildings in nuclear power plants. These plant buildings generally have a large spatial range and contain a large number of non-standard complex specification size structures and various types of pipelines and equipment. The running state of the equipment inside these plant buildings is directly related to the safety of nuclear power and power production. In order to ensure the safe operation of the nuclear power plant, the existing nuclear power plant generally uses a manual inspection method to inspect the environment and equipment of the plant building, so as to timely discover abnormal conditions of the environment and equipment, thereby issuing a warning signal and taking countermeasures.

[0003] Due to the complex environment and equipment inside the plant building, some structures have large spatial structures and large floor height differences, which are prone to cause personnel to fall, mechanical injury, electric shock, heatstroke, poisoning and other accidents. In order to ensure the safety and effectiveness of manual inspection, the existing manual inspection requires at least two personnel to perform mutual monitoring. However, this manual inspection method has high safety risks, is time-consuming and labor-intensive, and the quality of the inspection is directly related to the experience and physical quality of the personnel. In particular, in dangerous areas such as high temperature, strong noise and radiation, there is a high risk of missed inspection and personnel injury. Since manual inspection is usually performed according to work procedures, these work procedures are established on the basis of operating specifications, standards and experience, and are usually updated only after a long period of time. It is difficult to dynamically and finely inspect the plant building environment and equipment state, and there is a risk of over-inspection or insufficient inspection. In addition, since manual inspection relies on inspection tools and manual recording and analysis, human error is likely to occur, and it is also difficult to quickly identify and evaluate environmental and equipment hazards, which may result in the failure to timely discover some serious hazards, thereby affecting the safe operation of the power plant. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a nuclear power plant inspection method and system in view of at least one defect in the prior art.

[0005] The technical solution adopted by the present application to solve the technical problem is: constructing a nuclear power plant inspection method, comprising the following steps:

[0006] S10, generating a risk guide map according to plant three-dimensional data and a risk database;

[0007] S20, formulating an inspection task execution strategy according to the risk guide map and performance parameters of an inspection device;

[0008] S30, executing the inspection task execution strategy to obtain an inspection result;

[0009] S40, performing security risk analysis on the inspection result to obtain a security analysis result, and updating the security analysis result to the risk database;

[0010] S50, judging whether the updated risk database will affect the formulation of the inspection task execution strategy, and if yes, returning to the step S10, and if not, returning to the step S20.

[0011] In the nuclear power plant inspection method, the step S10 comprises:

[0012] S101, obtaining security risk factor data according to the plant system and equipment database, plant probabilistic safety analysis data, and feedback database in the risk database;

[0013] S102, determining an inspection object according to the security risk factor data;

[0014] S103, performing probabilistic safety evaluation processing on the inspection object to obtain expected risk data of the inspection object;

[0015] S104, formulating a three-dimensional risk distribution map according to the expected risk data and plant three-dimensional data;

[0016] S105, setting an inspection task priority of the inspection object according to the three-dimensional risk distribution map, and further formulating an inspection task target according to the inspection task priority and the inspection object;

[0017] S106, generating the risk guide map according to the three-dimensional risk distribution map and the inspection task target.

[0018] In the nuclear power plant inspection method, the step S20 comprises: obtaining inspection content and inspection frequency of the inspection object according to the risk guide map, and formulating an inspection task execution strategy according to the inspection content, the inspection frequency, and performance parameters of an inspection device.

[0019] In the nuclear power plant inspection method, the step S20 further comprises: updating the inspection task execution strategy according to business operation data.

[0020] In the nuclear power plant inspection method, the step S40 comprises: performing security analysis processing on the inspection object according to the inspection result to obtain current risk data of the inspection object, and updating the current risk data to the feedback database.

[0021] In the nuclear power plant inspection method, the step S50 comprises:

[0022] S501, obtaining the expected risk data according to the risk guide map;

[0023] S502, obtaining the current risk data according to the updated risk database;

[0024] S503, comparing the current risk data with the corresponding expected risk data respectively, and judging whether there is an uncontained safety risk factor in the current risk guide map according to the comparison result, if yes, executing step S504, otherwise returning to step S20;

[0025] S504, judging whether the uncontained safety risk factor will affect the formulation of the inspection task execution strategy, if yes, returning to step S10, otherwise returning to step S20.

[0026] In the nuclear power plant inspection method, the step S30 comprises: setting a control mode of the inspection equipment according to the plant system state feedback signal, and executing the inspection task execution strategy according to the control mode to obtain an inspection result; wherein the control mode comprises an automatic control mode, a semi-automatic control mode and a manual control mode.

[0027] The application further provides a nuclear power plant inspection system, comprising:

[0028] A risk guide map making unit is configured to generate a risk guide map according to plant three-dimensional data and a risk database;

[0029] An inspection equipment is configured to execute an inspection task execution strategy to obtain an inspection result;

[0030] A strategy making unit is configured to make the inspection task execution strategy according to the risk guide map and performance parameters of the inspection equipment;

[0031] A safety risk analysis unit is configured to perform safety risk analysis on the inspection result, output a safety analysis result, and update the safety analysis result to the risk database;

[0032] A judging unit is configured to judge whether the updated risk database will affect the formulation of the inspection task execution strategy, if yes, control the risk guide map making unit to generate the risk guide map, otherwise control the strategy making unit to make the inspection task execution strategy.

[0033] In the nuclear power plant room inspection system, the risk guide map making unit is used to obtain safety risk factor data according to a plant system and equipment database, plant probabilistic safety analysis data and a feedback database in the risk database, determine an inspection object according to the safety risk factor data, perform probabilistic safety evaluation processing on the inspection object to obtain expected risk data of the inspection object, formulate a three-dimensional risk distribution map according to the expected risk data and plant three-dimensional data, set an inspection task priority of the inspection object according to the three-dimensional risk distribution map, formulate an inspection task target according to the inspection task priority and the inspection object, and generate a risk guide map according to the three-dimensional risk distribution map and the inspection task target.

[0034] In the nuclear power plant room inspection system, the business operation data input unit is further used to obtain business operation data, so that the strategy making unit updates the inspection task execution strategy according to the business operation data.

[0035] The nuclear power plant room inspection method provided by the application has the following beneficial effects: the method generates a risk guide map according to plant three-dimensional data and a risk database, formulates an inspection task execution strategy according to the risk guide map and performance parameters of an inspection device, then executes the inspection task execution strategy to obtain an inspection result, performs safety risk analysis on the inspection result, updates a safety analysis result to the risk database, judges whether the updated risk database will affect the formulation of the inspection task execution strategy, updates the risk guide map if there is an effect, and formulates the inspection task execution strategy according to the risk guide map and the performance parameters of the inspection device if there is no effect. The application realizes precise inspection of a nuclear power plant by controlling an inspection device to replace a staff member to perform inspection, reduces the risk of staff injury, analyzes each inspection result, dynamically updates an object or a task target that needs to be inspected, avoids over-inspection and insufficient inspection, and improves the accuracy and effect of inspection. BRIEF DESCRIPTION OF DRAWINGS

[0036] The application will be further described below in combination with the drawings and embodiments, and the drawings are as follows:

[0037] Figure 1 is a structural diagram of the nuclear power plant room inspection method provided by the application;

[0038] Figure 2 is a structural diagram of step S10 in the nuclear power plant room inspection method provided by the application;

[0039] Figure 3 is a structural diagram of step S50 in the nuclear power plant room inspection method provided by the application;

[0040] Figure 4 is a structural diagram of a nuclear power plant building inspection system provided by the present application. DETAILED DESCRIPTION

[0041] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0042] Reference Figure 1 The present application provides a nuclear power plant building inspection method, comprising: steps S10, S20, S30, S40 and S50.

[0043] S10, generating a risk guidance map according to plant three-dimensional data and a risk database. The plant three-dimensional data comprises three-dimensional structure data and position data of equipment and buildings in each plant of a nuclear power station (such as a steam turbine plant, a cooling water pump plant, an emergency diesel engine plant and a nuclear fuel plant, etc.), providing specific spatial position data of each plant and its equipment for making the risk guidance map. The risk database comprises a plant system and equipment database, plant probabilistic safety analysis data and a feedback database,

[0044] Further, as shown in Figure 2 S10 comprises steps S101, S102, S103, S104, S105 and S106.

[0045] S101, obtaining safety risk factor data according to the plant system and equipment database, the plant probabilistic safety analysis data and the feedback database in the risk database.

[0046] The plant system and equipment database is used to store relevant specification standards of plant systems and equipment, including various working standards of systems and equipment, radiation dose standards of each system (such as a cooling system and a primary loop system, etc.), working temperature standards of equipment (steam turbines, water pumps, etc.) and other standards.

[0047] The plant probabilistic safety analysis data is used to store results after probabilistic safety evaluation (PSA) of a nuclear power plant building, so as to preliminarily obtain risk evaluation data such as safety margin, failure probability and residual life of relevant systems and equipment. In addition, the plant probabilistic safety analysis data can be obtained from a probabilistic safety evaluation system of a nuclear power station.

[0048] The feedback database is used to store safety analysis results obtained by previous inspection. Since some risk factors may be ignored, such as when a staff member finds that an abnormality occurs in a certain equipment, or when it is found that some risk factors are ignored by previous inspection tasks, the content of the feedback database can be updated in the form of active feedback. Therefore, the feedback database is also used to store experience feedback data input by a user, so as to avoid omission in inspection.

[0049] The specific process of step S101 is as follows: the specification standards of the plant system and equipment, the analysis results of the PSA, and the feedback data are analyzed. For example, the temperature and radiation dose of each plant, which are data that must be monitored in the specification standards, are determined as safety risk factors that need to be inspected; the equipment with high failure probability, low safety margin, low residual life, and abnormal equipment according to the analysis results of the PSA also belong to safety risk factors that need to be inspected; and the newly added risk factors found through previous inspections also belong to safety risk factors that need to be inspected, so as to obtain all the safety risk factors of the nuclear power plant as much as possible. These safety risk factors constitute safety risk factor data.

[0050] S102, determining the inspection object according to the safety risk factor data. For example, the temperature of some plants, the high failure probability of some equipment, the low safety margin of some equipment, and the abnormality of some equipment need to be monitored, and these plants and equipment are determined as the inspection object.

[0051] S103, performing a probabilistic safety assessment process on the inspection object to obtain the expected risk data of the inspection object. Specifically, although the plant probabilistic safety analysis data stores the safety margin, failure probability, and residual life of part of the system and equipment, the inspection object determined in step S102 may be different from this part of the system and equipment. Therefore, a probabilistic safety assessment process is performed on the determined inspection object to ensure that the expected risk data of each inspection object is obtained, providing data basis for the subsequent steps. The expected risk data includes expected safety margin, expected failure probability, and expected residual life.

[0052] S104, preparing a three-dimensional risk distribution map according to the expected risk data and the three-dimensional data of the plant. Further, different levels of three-dimensional risk areas can be established according to the size of the expected failure probability, providing a basis for determining the inspection priority of the inspection object.

[0053] S105, setting a patrol task priority of the patrol object according to the three-dimensional risk distribution map, and then formulating a patrol task target according to the patrol task priority and the patrol object. Specifically, the patrol task priority is set based on the expected failure probability in the expected risk data, and if the expected failure probability is within a preset risk level range, the patrol task priority of the patrol object is set as the priority corresponding to the preset risk level range. For example, when the expected failure probability of the patrol object is within the first risk level range, the patrol task priority of the patrol object is set as the first priority. The safety risk factors corresponding to the patrol object are obtained according to the patrol object, so as to determine the target to be inspected, such as the measurement data of the temperature, humidity and radiation dose of a factory building, whether a device with a high failure probability is normally operating, whether the working temperature thereof is normal, and whether smoke failure occurs, etc. Finally, the corresponding patrol requirements are set for the patrol object according to the determined patrol target and task priority, so as to formulate a patrol task target containing all patrol objects and their patrol requirements.

[0054] Further, the patrol requirements include patrol content and patrol frequency. The patrol content is determined by the risk factors or the patrol target, and is used to determine the specific detection task and target position of the patrol object; the patrol frequency is related to the patrol task priority, and is used to preliminarily determine the patrol number of the patrol object when the patrol task execution strategy is executed each time.

[0055] S106, generating a risk guidance map according to the three-dimensional risk distribution map and the patrol task target. Specifically, the expected risk data of each patrol object is obtained according to the three-dimensional risk distribution map, and the patrol task priority and the patrol requirements of each patrol object are obtained according to the patrol task target, and the expected risk data and the patrol task priority of each patrol object are associated with the three-dimensional risk distribution map, so as to generate a risk guidance map for representing the position, expected risk data, patrol task priority and patrol requirements of each patrol object.

[0056] In some embodiments, the risk guidance map can utilize a remote monitoring platform to interactively process and visually process the patrol task target and the three-dimensional risk distribution map; the risk guidance map can be a three-dimensional or two-dimensional map. In order to facilitate personnel interaction, the risk guidance map can use green, yellow, orange and red colors to represent different levels of risk areas.

[0057] S20, formulating a patrol task execution strategy according to the risk guidance map and the performance parameters of the patrol equipment.

[0058] Further, step S20 includes obtaining the patrol content and the patrol frequency of the patrol object according to the risk guidance map, and formulating the patrol task execution strategy according to the patrol content, the patrol frequency and the performance parameters of the patrol equipment. The performance parameters of the patrol equipment include the performance in motion efficiency, energy supply, communication and data acquisition, etc.

[0059] Specifically, the inspection task execution strategy is formulated according to the inspection content, the inspection frequency, and the performance parameters of the inspection equipment, including: determining the data (such as temperature, humidity, radiation dose, etc.) and monitoring and early warning feedback data (such as whether a certain device is operating normally, whether smoke failure occurs, etc.) that need to be detected for each inspection object according to the inspection content, then combining the inspection frequency and the performance parameters of the inspection equipment to determine the inspection path of each inspection object, and analyzing the inspection path of each inspection object to determine the best inspection route, thereby formulating an inspection task execution strategy with comprehensive monitoring range and good inspection route.

[0060] In some embodiments, step S20 further includes updating the inspection task execution strategy according to business operation data. Specifically, after formulating the inspection task execution strategy, the operation, start-stop, protection, monitoring, and emergency of the inspection equipment can be adjusted by online acquisition of business operation data, and the inspection path planning, start-stop protection task planning, and monitoring planning of the inspection equipment are updated according to these strategies, thereby determining the final inspection task execution strategy. The business operation data includes plant equipment state monitoring data and operation instruction data.

[0061] S30, execute the inspection task execution strategy to obtain an inspection result. Specifically, an execution instruction is generated according to the inspection task execution strategy, the inspection equipment is controlled to execute the inspection task, the inspection equipment obtains corresponding detection data and monitoring and early warning feedback data, these detection data and monitoring and early warning feedback data are taken as the inspection result, and a process and result record file of the current inspection task is established to store the inspection result and provide data reference for subsequent steps.

[0062] In some embodiments, step S30 includes setting a control mode of the inspection equipment according to a plant system state feedback signal, and executing the inspection task execution strategy according to the control mode to obtain the inspection result; wherein the control mode includes an automatic control mode, a semi-automatic control mode, and a manual control mode. Further, the plant system state feedback signal includes an emergency inspection signal (output when emergency inspection is needed in an emergency situation) and a temporary dispatch signal (output when a worker is temporarily dispatched).

[0063] S40, perform a safety risk analysis on the inspection result to obtain a safety analysis result, and update the safety analysis result to a risk database.

[0064] Further, the step S40 comprises: performing security analysis processing on the inspection object according to the inspection result to obtain current risk data of the inspection object, and updating the current risk data to the feedback database. The current risk data comprises current safety margin, current failure probability, current residual life and current accident probability. Specifically, the security analysis processing on the inspection object according to the inspection result comprises: taking a device as an example, performing probabilistic safety assessment on the device according to the inspection result to obtain current safety margin, current failure probability and current residual life of the device; based on the inspection result obtained by the device in this inspection, using a security analysis method to combine the current risk data obtained by the device in previous inspections to perform trend analysis, and finally calculating the current accident (such as fire, leakage, etc.) probability of the device.

[0065] S50, judging whether the updated risk database will affect the formulation of the inspection task execution strategy, if yes, returning to step S10, otherwise returning to step S20.

[0066] As shown in FIG. 5, in some embodiments, the step S50 comprises steps S501, S502, S503 and S504. Figure 3

[0067] S501, obtaining expected risk data according to the risk guide map.

[0068] S502, obtaining current risk data according to the updated risk database.

[0069] S503, comparing the current risk data with the corresponding expected risk data respectively, and judging whether there is an uncontained security risk factor in the current risk guide map according to the comparison result, if yes, executing step S504, otherwise returning to step S20. Specifically, the process of comparing the current risk data with the corresponding expected risk data respectively and judging whether there is an uncontained security risk factor in the current risk guide map according to the comparison result is as follows: taking a steam turbine as an example, judging whether the difference between the current safety margin of the steam turbine and the expected safety margin is greater than the corresponding early warning margin threshold, whether the difference between the current failure probability of the steam turbine and the expected failure probability is greater than the corresponding early warning failure threshold, whether the difference between the current residual life of the steam turbine and the expected residual life is greater than the corresponding early warning residual life threshold, and whether the current accident probability of the steam turbine is greater than the early warning accident threshold, if any of the four is yes, it is determined that there is an uncontained security risk factor in the current risk guide map.

[0070] S504, judging whether the uncontained security risk factor will affect the formulation of the inspection task execution strategy, if yes, returning to step S10, otherwise returning to step S20.

[0071] ​Specifically, the determining whether the un-included safety risk factor will affect the formulation of the inspection task execution strategy includes: firstly, analyzing the cause of the safety risk factor to obtain detection data and monitoring and early warning feedback data related to the un-included safety risk factor, and determining whether the detection data and the monitoring and early warning feedback data affect the formulation of the inspection task execution strategy. For example, when the difference between the current failure probability and the expected failure probability of a device is greater than the early warning failure threshold due to abnormal detection data (such as the working temperature of the device), if the detection data (such as the working temperature of the device) originally belongs to the range of the inspection target, it is determined that the un-included safety risk factor will not affect the formulation of the inspection task execution strategy; if the device is caused by abnormal monitoring and early warning feedback data (abnormal operation, smoke failure, etc.), it means that the device is likely to have failed, at which time an emergency signal needs to be fed back to the staff, and the inspection device needs to enter a semi-automatic control mode or a manual control mode to determine and handle the abnormality as soon as possible, at which time it is determined that the un-included safety risk factor will affect the formulation of the inspection task execution strategy; for another example, when the difference between the current remaining life and the expected remaining life of a device is greater than the early warning remaining life threshold, and the detection data of the device does not find abnormality, it means that the device ages faster than expected, and the inspection frequency of the device needs to be increased accordingly, at which time it is also determined that the un-included safety risk factor will affect the formulation of the inspection task execution strategy.

[0072] Reference Figure 4 The application also constructs a nuclear power plant inspection system, which comprises a risk guide map making unit, a strategy making unit, an inspection device, a safety risk analysis unit and a judging unit.

[0073] The risk guide map making unit is used to generate a risk guide map according to plant three-dimensional data and a risk database.

[0074] Further, the risk guide map making unit is used to obtain safety risk factor data according to the plant system and device database, plant probabilistic safety analysis data and feedback database in the risk database; determine an inspection object according to the safety risk factor data, perform probabilistic safety evaluation processing on the inspection object to obtain expected risk data of the inspection object; formulate a three-dimensional risk distribution map according to the expected risk data and the plant three-dimensional data; set an inspection task priority of the inspection object according to the three-dimensional risk distribution map to formulate an inspection task target according to the inspection task priority and the inspection object; and generate a risk guide map according to the three-dimensional risk distribution map and the inspection task target.

[0075] Further, the inspection task priority of the inspection object is set according to the three-dimensional risk distribution map, so as to formulate the inspection task target according to the inspection task priority and the inspection object, including: setting the inspection task priority based on the expected failure probability in the expected risk data, if the expected failure probability is within a preset risk level range, the inspection task priority of the inspection object is set as the priority corresponding to the preset risk level range; and the safety risk factors corresponding to the inspection object are obtained according to the inspection object, so as to determine the target to be inspected; finally, the corresponding inspection requirement of the inspection object is set according to the determined inspection target and task priority, so as to formulate the inspection task target containing the inspection object and the inspection requirement thereof. The inspection requirement includes the inspection content and the inspection frequency.

[0076] The inspection device is used to execute the inspection task execution strategy to obtain the inspection result.

[0077] In some embodiments, the inspection device is used to set the control mode of the inspection device according to the plant system state feedback signal, execute the inspection task execution strategy according to the control mode, and obtain the inspection result; wherein the control mode includes an automatic control mode, a semi-automatic control mode and a manual control mode.

[0078] The strategy formulation unit is used to formulate the inspection task execution strategy according to the risk guide map and the performance parameters of the inspection device.

[0079] In some embodiments, the strategy formulation unit is used to obtain the inspection content and the inspection frequency of the inspection object according to the risk guide map, and formulate the inspection task execution strategy according to the inspection content, the inspection frequency, and the performance parameters of the inspection device.

[0080] The safety risk analysis unit is used to perform safety risk analysis on the inspection result, output the safety analysis result, and update the safety analysis result to the risk database.

[0081] Further, the safety risk analysis unit is used to perform safety analysis processing on the inspection object according to the inspection result, so as to obtain the current risk data of the inspection object, and update the current risk data to the feedback database.

[0082] The judgment unit is used to judge whether the updated risk database will affect the formulation of the inspection task execution strategy, if yes, the risk guide map making unit is controlled to generate the risk guide map, otherwise the strategy formulation unit is controlled to formulate the inspection task execution strategy.

[0083] Further, the judging unit is configured to acquire expected risk data according to the risk guide map, acquire current risk data according to the updated risk database, compare the current risk data with the corresponding expected risk data respectively, judge whether there is an uncontained safety risk factor in the current risk guide map according to the comparison result, if there is, judge whether the uncontained safety risk factor will affect the formulation of the inspection task execution strategy, if the uncontained safety risk factor will affect the formulation of the inspection task execution strategy, control the risk guide map making unit to generate the risk guide map, if there is no uncontained safety risk factor or the uncontained safety risk factor will not affect the formulation of the inspection task execution strategy, control the strategy making unit to formulate the inspection task execution strategy.

[0084] In some embodiments, the nuclear power plant inspection system further comprises a business operation data input unit configured to acquire business operation data, so that the strategy making unit updates the inspection task execution strategy according to the business operation data.

[0085] It can be understood that the present application realizes accurate inspection of the nuclear power plant by controlling the inspection equipment to replace the staff to perform the inspection, reduces the risk of personal injury, analyzes the inspection result each time, and dynamically updates the object or task target to be inspected, so that the over-inspection and insufficient inspection are avoided, and the accuracy and effect of the inspection are improved.

[0086] It can be understood that the above embodiments only express the preferred embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application; it should be pointed out that for ordinary skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and some modifications and improvements can be made, which belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application should belong to the scope of the claims of the present application.

Claims

1. A method of inspecting a nuclear power plant building, characterized by, The method comprises the following steps: S10, generating a risk guide map for representing a position of each inspection object, expected risk data, an inspection task priority, and an inspection requirement according to plant three-dimensional data and a risk database; S20, formulating an inspection task execution strategy according to the risk guide map and performance parameters of an inspection device; S30, executing the inspection task execution strategy to obtain an inspection result; S40, performing a safety risk analysis on the inspection result to obtain a safety analysis result, and updating the safety analysis result to the risk database; S50, judging whether the updated risk database will affect formulation of the inspection task execution strategy, and returning to the step S10 if yes, or returning to the step S20 if no; The step S10 comprises: S101, obtaining safety risk factor data according to a plant system and device database, plant probabilistic safety analysis data, and a feedback database in the risk database; S102, determining an inspection object according to the safety risk factor data; S103, performing a probabilistic safety evaluation process on the inspection object to obtain expected risk data of the inspection object; S104, formulating a three-dimensional risk distribution map according to the expected risk data and plant three-dimensional data; S105, setting an inspection task priority of the inspection object according to the three-dimensional risk distribution map, and further formulating an inspection task target according to the inspection task priority and the inspection object; S106, generating the risk guide map according to the three-dimensional risk distribution map and the inspection task target; The step S40 comprises: performing a safety analysis process on the inspection object according to the inspection result to obtain current risk data of the inspection object, and updating the current risk data to a feedback database; wherein the current risk data comprises a current safety margin, a current failure probability, a current remaining life, and a current accident occurrence probability, the safety analysis process comprises: performing a probabilistic safety evaluation on each inspected device according to the inspection result to obtain a current safety margin, a current failure probability, and a current remaining life of each inspected device; and based on the inspection result of each inspected device obtained in this inspection, performing a trend analysis on the current risk data of each inspected device obtained in previous inspections by using a safety analysis method to obtain a current accident occurrence probability of each inspected device; The step S50 comprises: S501, obtaining expected risk data of each inspection object according to the risk guide map; wherein the expected risk data comprises an expected safety margin, an expected failure probability, and an expected remaining life; S502, obtaining current risk data of each inspection object according to the updated risk database; S503, respectively, the current risk data and the corresponding expected risk data are compared, and it is judged whether the current risk guidance map has an uncontained safety risk factor according to the comparison result, if yes, step S504 is executed, otherwise, the step S20 is returned; wherein, the comparison of the current risk data and the corresponding expected risk data includes: judging whether the difference between the current safety margin and the corresponding expected safety margin is greater than the corresponding warning margin threshold, whether the difference between the current failure probability and the expected failure probability is greater than the corresponding warning failure threshold, whether the difference between the current residual life and the expected residual life is greater than the corresponding warning residual life threshold, and whether the current accident occurrence probability is greater than the warning accident threshold, if any of the four is yes, it is determined that the current risk guidance map has an uncontained safety risk factor; S504, it is judged whether the uncontained safety risk factor will affect the formulation of the inspection task execution strategy, if yes, the step S10 is returned, otherwise, the step S20 is returned; wherein, the judgment of whether the uncontained safety risk factor will affect the formulation of the inspection task execution strategy includes: analyzing the cause of the safety risk factor to obtain detection data and monitoring and early warning feedback data related to the uncontained safety risk factor, and judging whether these detection data and monitoring and early warning feedback data affect the formulation of the inspection task execution strategy.

2. The method of claim 1, wherein, The step S20 includes: obtaining the inspection content and the inspection frequency of the inspection object according to the risk guidance map, and formulating the inspection task execution strategy according to the inspection content, the inspection frequency, and the performance parameters of the inspection equipment.

3. The method of claim 1 or 2, wherein, The step S20 further includes: updating the inspection task execution strategy according to business operation data.

4. The method of claim 1, wherein, The step S30 includes: setting the control mode of the inspection equipment according to the plant system state feedback signal, executing the inspection task execution strategy according to the control mode to obtain the inspection result; wherein, the control mode includes an automatic control mode, a semi-automatic control mode and a manual control mode.

5. A nuclear power plant building inspection system, characterized by, It includes: A risk guidance map making unit is used to generate a risk guidance map for representing the position, expected risk data, inspection task priority and inspection requirement of each inspection object according to plant three-dimensional data and a risk database, including: obtaining safety risk factor data according to the plant system and equipment database, plant probabilistic safety analysis data and feedback database in the risk database; determining an inspection object according to the safety risk factor data, performing probabilistic safety evaluation processing on the inspection object to obtain the expected risk data of the inspection object; formulating a three-dimensional risk distribution map according to the expected risk data and the plant three-dimensional data; setting the inspection task priority of the inspection object according to the three-dimensional risk distribution map to formulate an inspection task target according to the inspection task priority and the inspection object; and generating a risk guidance map according to the three-dimensional risk distribution map and the inspection task target; The inspection device is used for executing an inspection task execution strategy to obtain an inspection result. The strategy formulation unit is configured to formulate the inspection task execution strategy according to the risk guide map and performance parameters of the inspection device. The security risk analysis unit is configured to perform security risk analysis on the inspection result, output a security analysis result, and update the security analysis result to the risk database, including: performing security analysis processing on the inspection object according to the inspection result to obtain current risk data of the inspection object, and updating the current risk data to a feedback database; wherein the security analysis processing includes: performing probabilistic security evaluation on each inspected device according to the inspection result to obtain current safety margin, current failure probability and current remaining life of each inspected device; performing trend analysis on each inspected device by using a security analysis method in combination with current risk data of each inspected device obtained in previous inspections based on the inspection result of each inspected device obtained in this inspection to obtain a current accident occurrence probability of each inspected device. The judgment unit is configured to judge whether the updated risk database will affect the formulation of the inspection task execution strategy, and if so, control the risk guide map making unit to generate the risk guide map, otherwise control the strategy formulation unit to formulate the inspection task execution strategy, including: obtaining expected risk data of each inspection object according to the risk guide map; obtaining current risk data of each inspection object according to the updated risk database; comparing the current risk data with the corresponding expected risk data respectively, and judging whether there is an uncontained security risk factor in the current risk guide map according to the comparison result, if there is, judging whether the uncontained security risk factor will affect the formulation of the inspection task execution strategy, if the uncontained security risk factor will affect the formulation of the inspection task execution strategy, controlling the risk guide map making unit to generate the risk guide map; if there is no uncontained security risk factor or the uncontained security risk factor will not affect the formulation of the inspection task execution strategy, controlling the strategy formulation unit to formulate the inspection task execution strategy. The expected risk data includes expected safety margin, expected failure probability and expected remaining life, the current risk data includes current safety margin, current failure probability, current remaining life and current accident occurrence probability, and the comparison of the current risk data with the corresponding expected risk data includes: judging whether the difference between the current safety margin and the corresponding expected safety margin is greater than a corresponding warning margin threshold, whether the difference between the current failure probability and the expected failure probability is greater than a corresponding warning failure threshold, whether the difference between the current remaining life and the expected remaining life is greater than a corresponding warning remaining life threshold, and whether the current accident occurrence probability is greater than a warning accident threshold, if any of the four is yes, it is determined that the current risk guide map has an uncontained security risk factor.

6. The nuclear power plant building inspection system of claim 5, wherein, The method further includes: The business operation data input unit is configured to acquire business operation data, so that the policy making unit updates the patrol task execution policy according to the business operation data.

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