Pressurizer Water Level Control by Makeup and Letdown Flows Operating in Discontinued Model

Abstract

The function of pressurizer water level control is to maintain a programmed water level in the pressurizer during its automatic operation [1, 2]. The system maintains the water level in the pressurizer, and indirectly maintains reactor coolant system inventory, within operating bounds and reduces the potential for pressurizer going water-solid and heater discovering. This paper proposes an optimized control method for pressurizer water level controlling by analysis and calculating the relationship between reactor coolant average temperature and pressurizer water level. The control method will simplify control strategy and obviously reduce the frequency of actuator operating for pressurizer water level controlling by makeup and letdown flows operating in discontinued.