Verification and Analysis of Thermal-Hydraulics System Program for a Power Plant Model

Abstract The thermal-hydraulic system analysis program is mainly used for the calculation and analysis of transient and accident processes in nuclear power plants, and it is one of the important tools for the design safety analysis of pressurized water reactor nuclear power plants. This article introduces a new software package that includes a thermal hydraulic system analysis program, Severe accident Calculation and Evaluation software for Nuclear Energy System (SCENES). SCENES is a thermal-hydraulic system analysis program developed using the staggered grid method based on a two-fluid and six-equations model. To verify the reliability of the thermal hydraulic system analysis program in this software package for calculating transient and accident process conditions in a nuclear power plant, this study models the main hydraulic systems and heat transfer components in the primary and secondary circuits of a nuclear power plant, and simulate and analyze its normal operating and accident conditions separately. The results were also compared and analyzed with the RELAP5 calculation results, which were in good agreement. The results indicate that the SCENES system analysis program is reasonable and reliable in calculating the main thermal hydraulic characteristic parameters of nuclear power plants during steady-state operation and certain accident transient processes. Meanwhile, this study lays the foundation for further program development in the future.