저출력 상태에서 급수 변화에 따른 증기발생기 수위분석(WH)

Abstract

In nuclear power plants, the water level is maintained by controlling the water supply when the steam generator's water level deviation occurs. During normal operation, the change in the water supply amount appears normally as the water level increases. However, in the start-up process where the water supply temperature is low, another phenomenon occurs. If supplying water at a low temperature, shrinkage occurs, and a S/G water level decrease occurs at the beginning of the injection. After a certain period of time, the water level of the steam generator rises only after the temperature of the supplied water has risen. There are many difficulties in controlling the level of the steam generator because it exhibits such an atypical characteristic at low power. It is particularly sensitive in nuclear power plants with small steam generator capacity. At low power, the change in the water level of the steam generator, which appears due to the change in the water supply temperature and the amount of water supply, is analyzed by performing a thermodynamic method.