| 摘要 |
A method of control of the auxiliary water in nuclear power plants is characterized in that a solenoid valve of an auxiliary feedwater flow control valve is energized via an automatic interlock signal after an auxiliary feedwater system is put into operation. A control system detects the water level in a steam generator and performs segmental control of opening of the auxiliary feedwater control valve in response to a preset value so as to maintain the water level in the steam generator. After the control valve is removed out of the control mode, the solenoid valve of the auxiliary feedwater flow control valve is de-energized and the control valve is restored to fully-open position. The control of the valve based on detecting of the water level can have four detectors with the water level change being based on a two out of four voting logic to overcome any signal faults, thus allowing for a redundancy configuration. The system may also be designed with a manual adjustment in addition to the automatic control. |
