STEAM TURBINE CONTROL DEVICE FOR NUCLEAR POWER PLANT

摘要

PROBLEM TO BE SOLVED: To provide a steam turbine control device capable of preventing the sudden decrease of driving steam for a turbine gland steam evaporator, a feed water pump driving steam turbine and a steam type air extractor. SOLUTION: This steam turbine control device is provided with a computing element 32 for computing a main steam pressure controls signal on the basis of signals from a main steam pressure detector 26 and a main steam pressure setter 30 provided at a main steam line 61; a main steam separation valve total closure detector 34 for detecting the total closure of a main steam separation valve 2; and a pressure control signal switch 33 for outputting a pressure control switching signal in the case of detecting the total closure of the main steam separation valve 2 and switching the pressure control signal onto the main steam pressure control signal side from a reactor dome pressure control signal.