Nuclear power plant main coolant system fault diagnosis method

Abstract

The invention relates to a nuclear power plant main coolant system fault diagnosis method. A model building module, a BPA generator, an evidence fusion module and a decision-making diagnosis device are sequentially connected in sequence, the model constructed by the module is used as the input of the evidence fusion module through the data calculated by the BPA generator, the result is fused by the evidence fusion module and is transmitted to the decision-making diagnosis device, and finally the decision-making diagnosis device outputs a judgment result. The fault symptom is used as evidence for identifying a target, and a fusion result is obtained through an evidence synthesis method to judge the fault type, according to the method, the uncertainty of the fault diagnosis is analyzed and expressed from the evidence angle., and a hypothesis set is continuously reduced by means of accumulation of evidence, so that the diagnosis result is more objective and accurate. The fault symptom isused as the evidence for identifying a target, a fusion result is obtained through an evidence synthesis method to judge the fault type, according to the method, the uncertainty of the fault diagnosisis analyzed and expressed from the evidence angle, and a hypothesis set is continuously reduced by means of accumulation of evidence, and the 'unknown' and 'uncertain' can be distinguished, so that the diagnosis result is more objective and accurate. The BPA is generated by utilizing the triangular fuzzy number, the specific numerical value is obtained through quantitative calculation and is convenient to analyze, and the calculation is simple and convenient; secondly, the method has stronger flexibility and is beneficial to the analysis personnel to make a decision.

Description

technical field [0001] The invention relates to a fault diagnosis technology, in particular to a fault diagnosis method for the main coolant system of a nuclear power plant. Background technique [0002] Nuclear energy is safe, clean and efficient energy. In order to meet the power demand, optimize the energy structure, and promote sustainable economic development, China is vigorously developing the nuclear power industry. At present, there are 24 nuclear power units under construction, with an installed capacity of 26.549 million kilowatts, ranking first in the world in terms of scale under construction, accounting for 37.77% of the installed capacity of nuclear power units under construction in the world. Nuclear power safety has always been the focus of attention. The safety of nuclear power plants should be able to effectively and reliably guarantee the safety of surrounding residents and nuclear power workers, so the possibility of potential nuclear power accidents mus...

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the problem that in the main coolant system of a nuclear power plant, there are not only various types of equipment failures but also different causes of failures, resulting in difficult accurate fault diagnosis, and proposes a fault diagnosis method for the main coolant system of a nuclear power plant, which can be more accurate It can accurately describe the change of fault diagnosis confidence with symptom parameter value, effectively reflect the relationship between fault and symptom and make accurate judgment and decision

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