Development of system analysis code and its application in transient simulation of supercritical CO2 Brayton cycle direct cooled reactors

• Published in: Annals of nuclear energy 2025-02, Vol.211, p.111031, Article 111031
• Main Authors: Wu, Haijie, Liu, Minyun, Liu, Shenghui, Meng, Jiatao, Chen, Shuangqing, Zheng, Ruohan, Huang, Yanping, Gong, Houjun, Zhu, Xiaoliang, Xing, TianYang, Jiang, Mudi
• Format: Article
• Language: English
• Subjects: Brayton cycle; Load tracking; Supercritical CO2 direct cooled reactor; System analysis code; Transient simulation
• ISSN: 0306-4549
• DOI: 10.1016/j.anucene.2024.111031

•A system code NUSAS has been developed for the simulation of s-CO2 cooled reactor.•The simulation capability and accuracy of NUSAS code have been verified.•Transient processes related on core power and cooling water have been simulated.•The transient phenomena during the reactor load tracking process have been analyzed. The supercritical carbon dioxide (s-CO2) Brayton cycle direct cooled reactor system has the characteristics of high cycle efficiency, compact equipment, and simple layout, which has attracted the attention of researchers recently. The use of s-CO2 Brayton cycle and the elimination of intermediate heat exchangers make the transient characteristics of this reactor different from light water reactors which have rich operating experience. Transient simulation and safety analysis with system code is an essential stage in reactor design and safety verification. Therefore, a system code, named NUSAS (NUclear Safety Analysis and Simulation), was developed in this study for the transient simulation of s-CO2 Brayton cycle direct cooled reactor system. This code is developed based on the advanced two-fluid two-pressure seven-equation model and has the capability of modelling the turbomachinery in s-CO2 Brayton cycle direct cooled reactor system. The transient characteristics during core power step and precooler cooling water mass flow rate step were analyzed. The load tracking and operation control strategy of the reactor was designed, and transient simulations of the wide range (100% to 50%) load tracking process were conducted. According to the simulation results of NUSAS, the transient characteristics of s-CO2 Brayton cycle direct cooled reactor were demonstrated when operating conditions change.