Core Design and Safety Study of TMSR with BeF₂-free Fuel Salt

In order to improve the performance of fuel breeding and core safety, new thorium molten salt reactor (TMSR) core was designed, which employs BeO as moderator and BeF₂-free fuel salt. Based on this design, steady state and transient safety characteristics of TMSR were preliminarily analyzed using multi-physics code. By the transient simulation for start-up, pump speed down/up, loss of heat sink and so forth, the temperature and power response were analyzed. The results indicate that the new designed TMSR has excellent safety performance under various operating conditions.