Diagnosis method of nuclear power plant health status based on analytic hierarchy process and fuzzy evaluation

Abstract

The invention proposes a method for diagnosing the health state of a nuclear power plant based on hierarchical analysis and fuzzy evaluation. This method establishes the fault index system corresponding to each loop system for a nuclear power plant containing two loop systems, calculates the relative weight of the index layer index relative to the decision-making layer index in each index system, and then determines the evaluation object set and The evaluation results are collected, and the corresponding fuzzy matrix is ​​constructed to obtain the final evaluation result score of each evaluation object in each index system; finally, the final health status score corresponding to each loop system is obtained. The invention divides the nuclear power plant into layers, quantifies the fault index, evaluates the health state of the nuclear power plant by calculating and scoring, intuitively reflects the current health state of the nuclear power plant, optimizes the operation and maintenance plan, and reduces the cost.

Description

technical field [0001] The invention relates to the field of health diagnosis of nuclear power plants, in particular to a method for diagnosing the health state of nuclear power plants based on hierarchical analysis and fuzzy evaluation. Background technique [0002] In the related technology research of nuclear power plant, there is a common problem, that is, the performance of a certain functional unit of the system is degraded, but the corresponding function can still be realized to a certain extent. For a typical system containing such a unit, it is called partial failure system. [0003] The nuclear power plant reliability data system defines the partial failure of a component as: "a part of the failure appears, or the function of the component is considered to be lost". Its failure mode is: although the component can still complete its function, the partial loss of capacity affects its expected performance. Most of the fluid system components in a nuclear power plant...

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Problems solved by technology

Its failure mode is: although the component can still complete its function, but the partial loss of capacity affects its expected performance

Most of the fluid system components in a nuclear power plant have the possibility that they can perform their intended functions, but may not reach the success threshold described in the final safety analysis report or technical specification, so the nuclear power plant in this state The maintenance priority is relatively low, and it can be in a relatively late position in the operation and maintenance strategy. If it is maintained according to the fault state, it is actually a waste of human and material resources from the perspective of operation and maintenance strategy

[0004] In the traditional health status assessment methods of nuclear power plants, fault trees are mostly used to model and describe the failure modes of nuclear power plants, but there is a prominent problem in this type of method, that is, when the system cannot When the expected performance is achieved, it is determined that the system is faulty, and then the system needs to be maintained

As mentioned above, the complexity and redundant design of nuclear power plants make it common to have a "partial failure" failure mode, which is an unavoidable problem with traditional methods. Maintenance work is naturally a waste of human and material resources, that is, this traditional evaluation method is simple but relatively low in reliability

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