Power plant function model-based key and important equipment and part identification method and system

Abstract

The invention provides a key and important equipment and component identification method and system based on a power plant function model. The identification method comprises the following steps: step 1, establishing a complete model of power plant final influence caused by key and important equipment; 2, screening key power plant functions causing the final influence of the power plant; 3, screening key function groups supporting the power plant functions based on the key power plant functions; step 4, analyzing key important equipment of the key function group, and screening target key important equipment and a corresponding fault mode; and step 5, analyzing components influencing the fault mode in the target key and important equipment, and analyzing to obtain key and important components. According to the key and important equipment and component identification method based on the power plant function model, the key and important equipment is identified layer by layer by adopting multi-level influence evaluation and transmission, and the analysis experience of PSA is combined, so that function transmission from top to bottom and fault mode analysis iteration from bottom to top can be realized, no omission can be ensured, and the identification efficiency is improved. And the range of key and important equipment can be narrowed as much as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant fault analysis, and in particular to a method and system for identifying key important equipment and components based on a power plant function model. Background Art

[0002] Critical and important equipment refers to related equipment whose failure will affect the safety of the power plant, cause the power plant to shut down, and affect normal power generation. It is the equipment within the smallest range that a single failure of a nuclear power plant will directly affect the degradation of the safety performance of the nuclear power plant or cause unplanned shutdowns.

[0003] Although the nuclear power industry has reached a certain consensus and paid attention to the importance and failure impact of such key and important equipment, it is restricted by the limitations of failure mode and impact assessment on the design side, coupled with the lack of operating experience, resulting in the failure modes of many key and important equipment or specific equipment not being identified until the power plant is shut down or the power is reduced, which will undoubtedly bring great operating burdens and safety hazards to the power plant.

[0004] At present, the methods for identifying key and important equipment in power plants are divided into typical analysis methods: failure mode and effects analysis (FMEA) and fault tree analysis (FTA), but both have certain limitations.

[0005] Among them, FMEA analysis is a bottom-up evaluation method based on equipment monomers by identifying the functions caused by failures of structures, systems, and components (SSCs), using deterministic logic, which will cause a large number of equipment or unreasonable failure causes to be included in the SPV scope.

[0006] FTA analysis is a top-down deduction of unexpected faults using Boolean logic groups, assuming that the signal that triggers a shutdown or outage is complete. On the contrary, this method is prone to missing equipment or incomplete identification.

[0007] Based on this, the inventor of the present application proposes a method and system for identifying key important equipment and components based on a power plant functional model, in order to solve the above technical problems. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the defects in the prior art that a large amount of key and important equipment of a nuclear power plant can be identified or cannot be identified, and to provide a method and system for identifying key and important equipment and components based on a power plant functional model.

[0009] The present invention solves the above technical problems through the following technical solutions:

[0010] The present invention provides a method for identifying key and important equipment and components based on a power plant function model, which is characterized by comprising:

[0011] Step 1: Establish a complete model of the final impact of the power plant caused by key and important equipment;

[0012] Step 2, screening key power plant functions that cause the ultimate impact of the power plant;

[0013] Step 3: based on the key power plant functions, select key function groups that support the power plant functions;

[0014] Step 4: Analyze the key and important equipment of the key function grouping, and select the target key and important equipment and the corresponding failure mode;

[0015] Step 5: Analyze the components in the target key and important equipment that affect the failure mode, and obtain key and important components through analysis.

[0016] According to an embodiment of the present invention, the ultimate impact on the power plant is one of shutdown, power reduction, reduced safety performance, and reduced power generation reliability.

[0017] According to one embodiment of the present invention, step 1 further includes:

[0018] Establish a functional model of the power plant; the functional model includes power plant functions, system functions, functional groups and equipment groups; wherein,

[0019] The power plant functions include power generation and safety;

[0020] The system function is a decomposition function for realizing the power plant function;

[0021] The functional grouping is the division of the system functions;

[0022] The device grouping is the smallest device combination unit that supports the functional grouping.

[0023] According to one embodiment of the present invention, in step 4,

[0024] Analyze the key and important equipment through FMEA.

[0025] According to one embodiment of the present invention, step 4 further includes:

[0026] The typical failure modes of the key and important equipment are analyzed in combination with PSA, and by identifying the failure modes, it is determined whether the key and important equipment analyzed is the target key and important equipment.

[0027] According to one embodiment of the present invention, in step 5,

[0028] FMEA is used to analyze and screen the components in the target key equipment that affect the failure mode.

[0029] According to one embodiment of the present invention, step 5 further includes:

[0030] When performing component analysis of the failure mode, components with failure rates below a threshold are screened out.

[0031] The present invention also provides a key and important equipment and component identification system based on a power plant function model, which is characterized in that the key and important equipment and component identification method based on a power plant function model as described above is adopted, and the identification system comprises:

[0032] The target definition module builds a complete model of the final impact of the power plant caused by key important equipment;

[0033] A power plant function screening module, screening key power plant functions that cause the final impact of the power plant;

[0034] A function group determination module, which selects a key function group supporting the power plant function based on the key power plant function;

[0035] A key and important equipment determination module analyzes the key and important equipment grouped by the key functions, and selects target key and important equipment and corresponding failure modes;

[0036] The analysis module analyzes the components in the target key and important equipment that affect the failure mode, and obtains the key and important components through analysis.

[0037] The present invention also provides an electronic device, characterized in that it includes: a processor and a memory, the memory storing programs or instructions that can be run on the processor, and the program or instructions are executed by the processor to implement the key and important equipment and component identification method based on the power plant functional model as described in any one of claims 1-7.

[0038] The present invention also provides a readable storage medium, which is characterized in that the readable storage medium stores programs or instructions, and when the programs or instructions are executed by a processor, the method for identifying key important equipment and components based on the power plant functional model as described above is implemented.

[0039] The positive and progressive effects of the present invention are:

[0040] The present invention is based on the key and important equipment and component identification method of the power plant function model, adopts multi-level impact assessment and transmission, identifies key and important equipment and components layer by layer, and combines the analysis experience of PSA, can iterate the function transmission from top to bottom and the fault mode analysis from bottom to top, which can not only ensure that no omissions are made, but also narrow the scope of key and important equipment as much as possible. The present invention can realize the identification of key equipment in the early stage of power plant design, and directly guide the optimization path of design, management, procurement, operation and maintenance and other aspects through impact assessment. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0042] Figure 1 A model diagram of the nuclear power function of the present invention;

[0043] Figure 2 It is a flowchart of identifying key and important equipment based on functions of the present invention;

[0044] Figure 3 This is a flow chart for identifying an implementation method of a key and important device of the present invention;

[0045] Figure 4 It is a schematic diagram of the structure of the electronic device of the present invention. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0047] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used in all drawings to represent the same or similar parts. In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present invention may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand the present invention not only by the actual terms used, but also by the meaning implied by each term.

[0048] Please refer to Figures 1 to 3 The present invention proposes a method for identifying key important equipment and components based on a power plant function model, comprising:

[0049] Step 1: Build a complete model of the ultimate impact of the power plant caused by key important equipment.

[0050] Please refer to Figure 1 and Figure 2,The complete model proposed in the present invention includes three levels of analysis, the first level is the ,functional model of the power plant.

[0051] Specifically, the functional model of the power plant is a functional explicit model based on the layer-by-layer transmission and decomposition of the power plant functions. The model includes power plant functions, system functions, functional groupings, and equipment groupings.

[0052] Among them, the power plant function is the highest level function of the reactor, generally including power generation or safety; the system function is the decomposition carried out to achieve the power plant function, such as heat transfer, dedicated safety, etc.

[0053] To facilitate the implementation of functions, the system functions will be further divided into multiple functional groups, such as purification loop, emission subsystem, etc.;

[0054] Equipment grouping is the smallest equipment combination unit that supports functional grouping. This level has reflected the specific process and equipment composition.

[0055] The second level is when the power plant functions have been decomposed into specific equipment based on the functional model of the power plant. This level will conduct equipment FMEA analysis based on the function. The purpose of this analysis is to evaluate the key equipment and corresponding failure modes that affect the loss of a specific power plant function. This level requires the typical failure modes formed by combining PSA analysis and power plant experience, and can comprehensively judge whether the equipment has become a target key and important equipment by identifying the existence of the failure mode.

[0056] The third level is the component FMEA analysis model, which is based on the FMEA analysis results of the equipment. It transfers the impact of the mode that causes equipment failure to the components, and identifies key and important components by conducting FMEA analysis at the component level.

[0057] That is, different fault types can be evaluated and transmitted at multiple levels according to the above model, and key important equipment and components can be identified layer by layer.

[0058] Specifically, the final impact can be: shutdown, power reduction, safety performance degradation, power generation reliability degradation, etc. The complete model that causes the final impact of the power plant can be used as the basis for sequential analysis to find key important equipment and components. The following is an example of shutdown.

[0059] Step 2: Screen the key power plant functions that contribute to the final impact of the power plant.

[0060] According to the final impact of the power plant, analyze the main triggering functions that cause the impact. Figure 3 For example, for shutdown, it is possible to identify the corresponding functions that support normal power generation of the power plant but trigger shutdown after an abnormality. For example, the primary circuit is operating abnormally. The following examples are based on Figure 3 For example illustration.

[0061] Step 3: Based on the key power plant functions, select the key function groups that support the power plant functions.

[0062] After identifying the corresponding function, analyze the related equipment that supports the function. For example, the pipeline for water and gas supply to the containment is a key equipment that affects the normal operation of the primary circuit.

[0063] Step 4: Analyze the key and important equipment of the key function grouping, and select the target key and important equipment and the corresponding failure modes.

[0064] Based on the functional model of the power plant, when the power plant functions are decomposed into specific equipment, the equipment PMEA analysis can be carried out based on the function, so as to evaluate the key equipment and corresponding failure modes that affect the loss of a specific power plant function.

[0065] It should be noted that this process can combine probabilistic safety analysis (PSA) and typical failure modes formed by experience in in-service power plants, and determine whether the equipment is a critical and important equipment by identifying whether the failure mode exists.

[0066] During the analysis process, for critical and important equipment that has been identified but whose failure mode does not exist or has a very low probability, the equipment is not considered to be critical and important equipment, and there is no need to conduct component-level analysis. For example, for valves that are not operated during operation, their mechanical failures such as stuck open or closed are not considered.

[0067] For the key and important components of the analyzed key and important equipment, if their reliability is extremely high or the probability of failure is extremely low, there is no need to consider the possibility of their failure. For example, for the tank body or support of a primary circuit, although failure will cause the power plant to be unable to operate normally, its failure mode only considers mechanical failure (or rupture), and its components are composed of metal parts, the probability of failure is extremely low, and it is not included in the scope of key and important analysis.

[0068] For example, the compressed air isolation valve in the containment may fail to provide water or gas due to accidental closure or refusal to open, so it can be targeted as a key important equipment.

[0069] Step 5: Analyze the components in the target key and important equipment that affect the failure mode, and obtain key and important components through analysis.

[0070] After analyzing the key and important equipment and the corresponding failure modes, we start the analysis at the equipment component level, that is, analyzing which sensitive components in the equipment cause the failure mode to occur.

[0071] For example, the failure of the solenoid valve inside the pneumatic valve is a possible cause of the device refusing to open. False closing is further evaluated by means of signals, etc.

[0072] Please continue to refer to Figure 3 ,Based on the above analysis, taking the shutdown as an example, the result of the evaluation and analysis is that the pressure controlled isolation valve is the target key and important equipment, while the internal solenoid valve is the key and important component.

[0073] Through the above analysis, the power plant can adopt design elimination or improvement measures for the equipment, such as redundant settings to eliminate the equipment from becoming critical and important equipment, or improve the reliability of the equipment by increasing the safety level.

[0074] Moreover, for key and important components, the reliability of the equipment can also be improved through internal redundant design or structural improvement and other related means.

[0075] It should be noted that in the process of identifying key and important equipment, it is necessary to focus on identifying the specific system functions that cause the failure of specific functions of the power plant, and evaluate the key equipment analysis that causes the failure of the system function, so as to locate the key equipment. Combined with probabilistic safety assessment (PSA) data analysis or industry experience, the potential failure mode or cause of the equipment is located to determine whether the equipment has become a target key and important equipment.

[0076] Furthermore, during the analysis process, if the failure mode of an identified critical and important equipment does not exist or is extremely low in probability, the equipment is not considered critical and important, and no further component-level analysis is required. For example, if a valve is not operated during operation, its mechanical failure of being stuck open or closed is not considered.

[0077] For the key and important components of the key and important equipment that have been analyzed, if their reliability is extremely high or the probability of failure is extremely low, there is no need to consider the possibility of their failure.

[0078] For example, although failure of a tank or support in a primary circuit will cause the power plant to be unable to operate normally, its failure mode only considers mechanical failure (or rupture), and its components are composed of metal parts, the probability of failure is extremely low, and it is not recommended to be included in the scope of critical analysis.

[0079] The present invention also proposes a key and important equipment and component identification system based on a power plant function model, using the key and important equipment and component identification method based on a power plant function model as described above, the identification system comprises:

[0080] The target definition module builds a complete model of the final impact of the power plant caused by key important equipment;

[0081] A power plant function screening module, screening key power plant functions that cause the final impact of the power plant;

[0082] A function group determination module, which selects a key function group supporting the power plant function based on the key power plant function;

[0083] A key and important equipment determination module analyzes the key and important equipment grouped by the key functions, and selects target key and important equipment and corresponding failure modes;

[0084] The analysis module analyzes the components in the target key and important equipment that affect the failure mode, and obtains the key and important components through analysis.

[0085] In summary, the present invention is based on the key and important equipment and component identification method and system of the power plant function model, adopts multi-level impact assessment and transmission, identifies key and important equipment layer by layer, and combines the analysis experience of PSA, which can iterate the function transmission from top to bottom and the fault mode analysis from bottom to top, which can not only ensure that there is no omission, but also narrow the scope of key and important equipment as much as possible. The present invention can realize the identification of key equipment in the early stage of power plant design, and directly guide the optimization path of design, management, procurement, operation and maintenance and other aspects through impact assessment.

[0086] Reference Figure 4 The present invention also provides an electronic device 900, including: a processor 901 and a memory 902, the memory 902 stores a program or instruction that can be run on the processor 901, and the program or instruction is executed by the processor 901 to implement the above-mentioned key and important equipment and component identification method based on the power plant function model. When the program or instruction is executed by the processor 901, each process of the implementation method of the key and important equipment and component identification method based on the power plant function model is implemented, and the same technical effect can be achieved. In order to avoid repetition, it will not be repeated here.

[0087] The present invention also provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the above-mentioned key and important equipment and component identification method based on the power plant function model is implemented. When the program or instruction is executed by the processor, each process of the implementation method of the above-mentioned key and important equipment and component identification method based on the power plant function model is implemented, and the same technical effect can be achieved. In order to avoid repetition, it will not be repeated here.

[0088] For those skilled in the art, the above invention disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary implementation of the present application.

[0089] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0090] Some aspects of the present application may be performed entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The above hardware or software may be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". The processor may be one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DAPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, or combinations thereof. In addition, various aspects of the present application may be expressed as computer products located in one or more computer-readable media, which include computer-readable program codes. For example, computer-readable media may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, tapes ...), optical disks (e.g., compact disks CDs, digital versatile disks DVDs ...), smart cards, and flash memory devices (e.g., cards, sticks, key drives ...).

[0091] A computer-readable medium may include a propagated data signal containing computer program code, such as in baseband or as part of a carrier wave. The propagated signal may have a variety of manifestations, including electromagnetic, optical, etc., or a suitable combination. A computer-readable medium may be any computer-readable medium other than a computer-readable storage medium, which may be connected to an instruction execution system, device or apparatus to communicate, propagate or transmit a program for use. The program code on the computer-readable medium may be propagated via any suitable medium, including radio, cable, fiber optic cable, radio frequency signal, or similar medium, or any combination of the above mediums.

[0092] Similarly, it should be noted that in order to simplify the description disclosed in this application, so as to help understand one or more embodiments of the invention, in the above description of the embodiments of the present application, sometimes multiple features are merged into one embodiment, drawings or descriptions thereof. However, this disclosure method does not mean that the features required by the object of the present application are more than the features mentioned in the claims. In fact, the features of the embodiment are less than all the features of the single embodiment disclosed above. In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "approximately", "approximately" or "substantially" in some examples. Unless otherwise specified, "approximately", "approximately" or "substantially" indicate that the number allows a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining the digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, such numerical settings are as accurate as possible within the feasible range.

[0093] Although the present invention is disclosed as above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for identifying key and important equipment and components based on a power plant functional model, characterized in that: include: Step 1: Establish a complete model of the final impact of the power plant caused by key and important equipment; Step 2, screening key power plant functions that cause the ultimate impact of the power plant; Step 3: based on the key power plant functions, select key function groups that support the power plant functions; Step 4: Analyze the key and important equipment of the key function grouping, and select the target key and important equipment and the corresponding failure mode; Step 5: Analyze the components in the target key and important equipment that affect the failure mode, and obtain key and important components through analysis.

2. The method for identifying key and important equipment and components based on a power plant function model according to claim 1 is characterized in that: The ultimate impact on the power plant is one of shutdown, power reduction, reduced safety performance, and reduced power generation reliability.

3. The method for identifying key and important equipment and components based on a power plant function model according to claim 1 is characterized in that: The step 1 further includes: Establish a functional model of the power plant; the functional model includes power plant functions, system functions, functional groups and equipment groups; wherein, The power plant functions include power generation and safety; The system function is a decomposition function for realizing the power plant function; The functional grouping is the division of the system functions; The device grouping is the smallest device combination unit that supports the functional grouping.

4. The method for identifying key and important equipment and components based on a power plant function model according to claim 1 is characterized in that: In step 4, Analyze the key and important equipment through FMEA.

5. The method for identifying key and important equipment and components based on a power plant function model according to claim 4 is characterized in that: The step 4 further includes: The typical failure modes of the key and important equipment are analyzed in combination with PSA, and by identifying the failure modes, it is determined whether the key and important equipment analyzed is the target key and important equipment.

6. The method for identifying key and important equipment and components based on a power plant function model according to claim 4 is characterized in that: In step 5, FMEA is used to analyze and screen the components in the target key equipment that affect the failure mode.

7. The method for identifying key and important equipment and components based on a power plant function model according to claim 4 is characterized in that: The step 5 further includes: When performing component analysis of the failure mode, components with failure rates below a threshold are screened out.

8. A key and important equipment and component identification system based on a power plant functional model, characterized in that: The method for identifying key and important equipment and components based on a power plant function model as described in any one of claims 1 to 7 is adopted, wherein the identification system comprises: The target definition module builds a complete model of the final impact of the power plant caused by key important equipment; A power plant function screening module, screening key power plant functions that cause the final impact of the power plant; A function group determination module, which selects a key function group supporting the power plant function based on the key power plant function; A key and important equipment determination module analyzes the key and important equipment grouped by the key functions, and selects target key and important equipment and corresponding failure modes; The analysis module analyzes the components in the target key and important equipment that affect the failure mode, and obtains the key and important components through analysis.

9. An electronic device, characterized in that: include: A processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and the programs or instructions are executed by the processor to implement the method for identifying key and important equipment and components based on a power plant functional model as described in any one of claims 1 to 7.

10. A readable storage medium, characterized in that: The readable storage medium stores programs or instructions, and when the programs or instructions are executed by the processor, the method for identifying key and important equipment and components based on the power plant functional model as described in any one of claims 1-7 is implemented.

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