To comprehensively evaluate the safety of space nuclear reactors and provide technical support for their design and operation,based on probabilistic safety assessment(PSA)method,this study takes TOPAZ-Ⅱ space nuclear reactor power system as the research object,and a study on its initiating events(IEs)is carried out.A list of 15 IEs covering all mission phases of the TOPAZ-Ⅱ is obtained through two means:operational experience feedback and Failure Mode and Effects Analysis(FMEA).These IEs are further classified into 6 groups according to their system response process.Research has shown that due to the uniqueness of design features,operating environment,and mission phases,there are significant differences in the IE of space nuclear reactor power system compared to ground nuclear power facilities.The IE list and its grouping method determined for TOPAZ-Ⅱspace nuclear reactor power system in this study have laid the preliminary research foundation for the PSA of space nuclear reactors.
Space nuclear reactorTOPAZ-ⅡProbabilistic safety assessment(PSA)Initiating event(IE)analysisFailure mode and effects analysis(FMEA)
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