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BackgroundThe fast breeder reactor using helium-xenon mixture gas as coolant combined with Brayton thermoelectric conversion system is the development trend of space nuclear power in the future. In order to improve the system efficiency and reduce the system mass, many scholars have carried out research on the design of reactor parameters, but few of them involved helium xenon cooled reactors.PurposeThis study aims to design key parameters of small helium xenon cooled reactor.MethodsThe single channel model, primary surface regenerator and other component models were built by using FORTRAN 95 language programming, and the thermal system program was established afterward. The basic parameters of submerged subcritical reactor were used to verify the program, and the range of key parameters was determined by sensitivity analysis of a single parameter.ResultsThe results show that the regenerator has the greatest influence on the system efficiency and mass, and the pressure ratio of the compressor over 1.52 has less influence on the system mass.ConclusionsThis study provides a reference for the design of small helium xenon cooled reactor.