Reliability Analysis And Fault Diagnosis Of Nuclear Power System Conventional Island Water Supply System

With the vigorous development of nuclear power generation in the world,the safety issues of nuclear power plants are becoming increasingly prominent.In order to ensure the stable operation of the conventional island system of nuclear power plants,the instrument control system is increasingly improved.However,due to the large number of equipment and complex systems in the conventional island water supply system of nuclear power plants,how to evaluate the real-time reliability of the system has not yet been studied.In this paper,the reliability analysis technology is applied to the water supply system,and the study of the GO-FLOW reliability analysis method based on fault diagnosis is of great significance for improving the reliability evaluation level of the water supply system.Explain the existing reliability analysis method,and analyze the feasibility of using GO-FLOW method for dynamic reliability analysis of the water supply system.Aiming at the characteristics of multiple components and multiple faults in the water supply system,a reliability analysis method for the conventional island water supply system of nuclear power based on the improved GO-FLOW method is proposed.This method uses fish swarm algorithm to improve the support vector machine and establish the fault diagnosis system of the conventional island water supply system.Based on the diagnosis results,the entropy weight topsis and gray correlation are used to improve the GO-FLOW reliability evaluation method.The performance parameters are corrected to improve the accuracy of the system reliability evaluation when the water supply system fails,and to realize the real-time evaluation of the reliability of the water supply system.Based on the improved GO-FLOW method,a water supply system reliability model is constructed.According to the model,the reliability of the water supply system during normal operation,the system reliability when the water supply system fails,and the system reliability when the AC solenoid valve power distribution system is switched over are analyzed in turn,and a comparative experiment is designed.The results show that the improved GO-FLOW reliability analysis method can more accurately,real-timely and quantitatively evaluate the reliability of the entire system,and has the characteristics of high applicability,clear structure and fast calculation.It also provides a theoretical basis for the design of nuclear power distribution systems.