| 摘要 |
PURPOSE:To prevent the excessive cooling waterpouring in a system adding a proceeding control to open a flooding valve forcibly depending on the opening of a turbine bypass valve, by furnishing a device to devide plurally the valve opening by the proceeding control of the flooding valve. CONSTITUTION:In a temperature reduction control device to control a flooding valve 17 depending on the temperature at the latter stream side of a temperature reduction unit to reduce the temperature of the steam passing through a turbine bypass valve, is furnished a control arithmetic unit (PID) 33 to input the input signal of a subtracter 31 to find the difference of the after-reduction temperature and a set control value, and the output of the control arithmetic unit 33 is used as an opening command signal of the flooding valve 17. In this case, a first stage and a second stage proceeding opening signal generators 41 and 42 are furnished, and, the output signal of the signal generator 41, and the output signal from the signal generator 42 which has been converted by the output of a load cutting signal generator 43 and has passed through a converter 45 are added in an adder 46. The resultant signal is delivered to another adder 51 where it is added to the output of the control arithmetic unit 33.
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