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Dynamic analysis of passive heat removal system for molten salt reactor   WU Xiangcheng1, YAN Changqi1, SUN Lu2, and MENG Zhaoming1   1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, Heilongjiang, China (wuxiangcheng@hrbeu.edu.cn) 2. China Ship Development and Design Center, Wuhan 430064, China   Abstract: To get an insight of the transient behavior of Passive Residual Heat Removal System (PRHRS) for the molten salt reactor, a numerical study based on RELAP5 code was carried out. Ninety-nine control volumes are used for simulating the PRHRS. An auto gas blow-off device is installed in the system. In the model, the device is simplified by a trip valve. Heat flux boundary is given on the outer surface of the thimble and the atmosphere is served as a heat sink. At the initial state, helium is filled in the gas space. From the comparison of the correlations for prediction of decay power, Todreas& Kazimi formula is selected for calculation. The numerical results show the feasibility and efficiency of the PRHRS removing decay heat for the molten salt reactor. The discharging port is opened several times until the system pressure is no longer higher than the upper limit. A large increase of system pressure and water flow rate can be observed when water flows into the high-temperature tube. After discharging, the remaining gas mainly concentrates in the condenser and the downward channel after the condenser. The position of the discharging port was also studied. Keyword: passive residual heat removal system; molten salt reactor; numerical analysis; RELAP5
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