Effects of ocean conditions on water level measurement of pressurizer

Abstract

The aim of the study is to carry out the sloshing experiment and numerical simulation and obtain methods of reducing water level measurement error on the pressurizer of the offshore reactor. The additional acceleration caused by ocean conditions will lead to the liquid sloshing in pressurizer. In order to study the effects of this characteristic on the measurement error of water level, an experimental visualization system of scale model under sloshing conditions was established. The accuracy of the simulation model was verified by the experimental data of pressure and water level height. Considering the effects of excitation form, degrees of freedom and ship course, the water level measurement of the pressurizer was analyzed systematically. The correction of water level measurement error using motion compensation was discussed based on each degree of freedom's simulation results. And the new optimized measurement method is developed according to the fluctuation characteristics of the liquid level under surging motion. In addition, an inhibition model was preliminarily designed to reduce the fluctuation amplitude of the water level. The function of this model can prevent submersion of the sprinkler tuber and exposure of the electric heating rods. Finally, the applicability of the water level measurement technique of the pressurizer is verified under the motion of multiple degrees of freedom. The results demonstrate that the optimized measurement method and motion compensation significantly affect the water level measurement of the pressurizer under marine conditions, and the measurement deviation can be accepted by the measurement system of the offshore reactor pressurizer.