Abstract
Abstract Fluid transients occur mainly during fluid transfer in the networked pipe systems in nuclear power plants. Research on pipe network simulation is presented in literature. However, there are still some open technical gaps. In this paper, to satisfy the different time step requirements in different stages of nuclear power plant operation, and to improve the accuracy of simulation results, a multi-scale simulation model of single-phase water pipe networks is proposed. Therefore, the pipe networks are divided into control nodes and flow lines in a complete simulation map. The multi-scale simulation is obtained through the combination of simplified equations, time step selection and refined nodes. The accuracy and stability of the simulator are verified by modeling the feed water system of the Chinese experimental fast reactor. In addition, the output is compared with output of the commercial software, Jtopmeret. As a conclusion, the new model calculates results for this feed water system with a higher accuracy under dynamic operations which consistent with theoretical analysis.
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