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Simulation of pressurizer water level and causes of false water level in marine conditions   YANG Bo1, XIA Hong2, and ZHANG Ji-yu3   1. College of Nuclear Science and Technology, HARBIN ENGINEERING UNIVERSITY, No.145 Nantong Street, Harbin, Heilongjiang Province, 150000, P.R. China (yangbo12345@126.com) 2. College of Nuclear Science and Technology, HARBIN ENGINEERING UNIVERSITY, No.145 Nantong Street, Harbin, Heilongjiang Province, 150000, P.R. China (xiahong@hrbeu.edu.cn) 3. College of Nuclear Science and Technology, HARBIN ENGINEERING UNIVERSITY, No.145 Nantong Street, Harbin, Heilongjiang Province, 150000, P.R. China (82134227@qq.com)   Abstract: For marine nuclear reactors, the pressurizer is the key equipment for controlling the pressure stability of the reactor coolant system. One of the major problems in its design process is the liquid sloshing in the tank.In the study of liquid sloshing on the water level measurement in the pressurizer under marine conditions, it was verified that the SPH (Smoothed Particle Hydrodynamics) method can simulate the free liquid surface during sloshing well, and used to simulate the sloshing effectson the free liquid surface in the “Mutsu”’s pressurizer under marine conditions. In this paper, the effects of sloshing on 6 degrees of freedom (6-DOF) on the liquid level measurement were analyzed and compared with the experimental results, and they were in good agreement. Simultaneously, the cause of the false liquid level was analyzed by comparing the measured point pressure with the simulated water level. The analysis result shows that the vertical acceleration is the main cause of false liquid level, and the relationship between them is linear. According to the cause of the false water level, the compensation design of the pressurizer water level measurement was given. This study provides a reference for the design of pressurizer water level measurement system under marine conditions. Keyword:pressurizer; SPH; water level; sloshing
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