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Thermal-hydraulic simulation of the primary loop of the HTR ZHOU Yangping, WU Mengbai, ZHU Shutang, MA Yuanle, LI Fu, SHI Lei, and DONG Yujie   Institute of Nuclear and New energy Technology, Tsinghua University, Beijing, 100084 China (zhouyp@mail.tsinghua.edu.cn, jeffwmb@gmail.com, zhust@mail.tsinghua.edu.cn,mayl@mail.tsinghua.edu.cn, lifu@mail.tsinghua.edu.cn, shlinet@mail.tsinghua.edu.cn, dongyj@mail.tsinghua.edu.cn)   Abstract: Simulation of thermal-hydraulic processes taking place in the primary loop of the HTR (High Temperature gas–cooled Reactor) plays an important role in the development of a full scale HTR simulator. The thermal-hydraulic processes in the primary loop of the HTR are analyzed based on the design data and the current computational code. Then, various components of the primary loop are modeled, including the steam generator, the blower, and the pipeline. In addition, conservation of mass, momentum and energy and properties of the helium gas in the primary loop are analyzed in this paper. A methodology is proposed to solve the conservation equations. The computational code for simulating the primary loop of the HTR is developed using the FORTRAN language. The simulation results obtained using the computational code and the calculation results output by the THERMIX code are in close agreement with each other, which enables to verify the models and the methodology advanced in this paper.   Keyword:thermal-hydraulic simulation;simulator; primary loop; HTR
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