Abstract
This study mainly investigates the liquid level characteristics and reconstruction strategy for the in-vessel pressurizer under ocean conditions. The internals in the pressurizer affect the distribution of dynamic pressure, which causes confusion whether gauge pressure can be directly used to measure liquid level. Therefore, based on the CFD simulation, the dynamic distributions inside the pressurizer and the influence of the internals on the pressurizer are analyzed. Subsequently, the influence of different motions on liquid surface is obtained by analyzing the characteristics of pressure, and a liquid level reconstruction strategy according to measured pressure is designed. The results show that the presence of internal components will make the maximum dynamic pressure occur near the internal components, and it has little influence on the use of gauge pressure to obtain the liquid level. The influence of swinging motion on the pressure is mainly caused by the tilting of the liquid surface during the movement. Linear motions affect measured pressure by generating additional acceleration in the direction of motion. Besides, the liquid level reconstruction strategy proposed can reconstruct the liquid surface well and the maximum deviation is within 3%.
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