RISMC Analysis Method Used in Operation and Maintenance of Nuclear Power Plant

Risk informed safety margin characteristics (RISMC) analysis Method, is a safety analysis method which combines probability safety analysis and determinism safety analysis of nuclear power plant. General RISMC analysis platform “CARS” (Coupling Platform for Advanced Risk Simulation) can provide parameter distribution and Monte Carlo sampling function, and interactive coupling function with data of the thermal hydraulic safety analysis system program. The paper uses CARS and thermal hydraulic safety analysis system program to analyzes the technical requirements of personnel training and engineering modification of nuclear power plant, by means of accident scenario sampling, physical mechanism calculation and scenario consequence statistics. In the analysis process, various important factors which may affect the event process and consequences are comprehensively considered through the analysis of nuclear power plant operation rules, equipment reliability and the uncertainty distribution characteristics of key factors. And consequences of event scenario development, nuclear power plant response and the time course are analyzed through establish a realistic physical model by using thermal hydraulic safety analysis system program. The calculation results give the target level of personnel training and the effectiveness of engineering modification. The results show that RISMC analysis Method is an effective safty analysis and decision making method for operation and maintenance of nuclear power plants.