Design Improvement and Application on Control Logic of High Level Control Valve of High Pressure Feedwater Heater System in Nuclear Power Plant

The high level control valve of the high pressure feedwater heater system in nuclear power plant is used to control the water level of the feedwater heater. According to experience from some nuclear power plant, the control logic of the high level control valve for CPR1000 was improved. The test results show that the water level of the high pressure feedwater heater can return to stable level quickly after upset condition during the transient test.