Development of a dynamics model for graphite-moderated channel-type molten salt reactor  

作　　者：Long He Cheng-Gang Yu Rui-Min Ji Wei Guo Ye Dai Xiang-Zhou Cai 

机构地区：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences [2]CAS Innovative Academy in TMSR Energy System, Chinese Academy of Sciences [3]University of Chinese Academy of Sciences

出　　处：《Nuclear Science and Techniques》2019年第1期145-155,共11页核技术（英文）

基　　金：supported by the Chinese TMSR Strategic Pioneer Science and Technology Project(No.XDA02010000);the Frontier Science Key Program of the Chinese Academy of Sciences(No.QYZDY-SSW-JSC016);the National Natural Science Foundation of China Key Program(No.91326201)

摘　　要：A molten salt reactor(MSR) is one of the six advanced reactor concepts selected by the generation Ⅳ international forum because of its advantages of inherent safety, and the promising capabilities of Th-U breeding and transuranics transmutation. A dynamics model for the channel-type MSR is developed in this work based on a three-dimensional thermal–hydraulic model(3DTH) and a point reactor model. The 3DTH couples a three-dimensional heat conduction model and a one-dimensional single-phase flow model that can accurately consider the heat conduction between different assemblies. The 3DTH is validated by the RELAP5 code in terms of the temperature and mass flow distribution calculation. A point reactor model considering the drift of delayed neutron precursors is adopted in the dynamics model. To verify the dynamics model, three experiments from the molten salt reactor experiment are simulated. The agreement of the experimental data and simulation results was excellent.With the aid of this model, the unprotected step reactivity addition and unprotected loss of flow of the 2 MWt experimental MSR are modeled, and the reactor power and temperature evolution are analyzed.A molten salt reactor(MSR) is one of the six advanced reactor concepts selected by the generation Ⅳ international forum because of its advantages of inherent safety, and the promising capabilities of Th-U breeding and transuranics transmutation. A dynamics model for the channel-type MSR is developed in this work based on a three-dimensional thermal–hydraulic model(3DTH) and a point reactor model. The 3DTH couples a three-dimensional heat conduction model and a one-dimensional single-phase flow model that can accurately consider the heat conduction between different assemblies. The 3DTH is validated by the RELAP5 code in terms of the temperature and mass flow distribution calculation. A point reactor model considering the drift of delayed neutron precursors is adopted in the dynamics model. To verify the dynamics model, three experiments from the molten salt reactor experiment are simulated. The agreement of the experimental data and simulation results was excellent.With the aid of this model, the unprotected step reactivity addition and unprotected loss of flow of the 2 MWt experimental MSR are modeled, and the reactor power and temperature evolution are analyzed.

关 键 词：MOLTEN SALT REACTOR THERMAL-HYDRAULICS Point REACTOR model Thermal coupling 

分 类 号：TL[核科学技术]