Development Of Prototype Software For Coupling DSA&PSA Based On RELAP5

Nuclear safety is the lifeline of nuclear power development.In response to the shortcomings of the single deterministic and probabilistic safety analysis methods,researchers have carried out research and tool development on the coupling of deterministic and probabilistic safety analysis.Through the coupling of determinism and probabilistic safety analysis,the dynamic behavior and evolution process of the system under accident conditions of nuclear power plants can be understood more scientifically,and decision support can be provided for the design,operation,and management of nuclear power plants.The purpose of the research is to design and develop prototype software for coupled analysis of determinism and probability theory based on the RELAP5/MOD4.0 program and lay the foundation for the research and development of my country’s independent deterministic and probability theory coupled analysis platform software.By investigating the current situation of domestic and foreign deterministic and probabilistic coupling analysis methods and tools,the Monte Carlo and Dynamic Event Tree coupling methods based on RELAP5 are summarized;on this basis,the functional requirements of the deterministic and probabilistic coupling analysis prototype software(DMRIA)are completed.Analyzed,carried out the design of two main function modules of DMRIA and the function division of each module,and completed the detailed design of each sub-function module,including RLEAP5 simulation drive module,DMRIA,and RELAP5 data interaction module,coupling interface design,and user interaction interface design and data structure design,etc.Based on the Python 3.7 language and in accordance with the principle of modular design,the DMRIA software development was completed on the Windows platform.Based on the SNC01 pressurized water reactor nuclear power plant model provided by the RAVEN program framework developed by the Idaho Laboratory in the United States,the power failure accident test case of the whole plant was simulated,and the DMRIA software function test was carried out for the Monte Carlo sampling method and the dynamic event tree method.The comparative analysis and theoretical analysis with RAVEN software analysis results show that DMRIA software satisfies the design function and verifies the key technology based on the coupling of MC and DET with RELAP5.The results of this research can be used as the basis for the development of deterministic and probability theory coupled analysis platform software.