Ensuring nuclear safety is a prerequisite for development of reactors. Therefore, it is necessary to establish a scientific and comprehensive theoretical system for safety analysis. Appropriate safety analysis methods and tools should be employed to objectively and accurately assess and understand the safety characteristics of reactors. The methods of nuclear reactor safety analysis can be divided into two categories: deterministic safety analysis (DSA) methods and probabilistic safety assessment (PSA) methods (Zhu et al., 2019). Currently, the safety analysis conducted for possible accidents in nuclear power plants uses deterministic analysis methods and probabilistic safety assessment methods.