SUPPRESSION DEVICE OF NUCLEAR REACTOR WATER LEVEL

PURPOSE:To obtain a controller for nuclear reactor feed water which enables suppressing excess level change of nuclear reactor water even in insertion operation period of a selected control rod. CONSTITUTION:A controller for nuclear reactor feed water is equipped with a comparator 11 to which standard water level signal and nuclear reactor water level signal both are input, an adder 16 which outputs adding signal by adding a mismatch flow signal that is a difference signal consisting of difference between main steam flow signal and feed water flow signal, and also is multiplied by mismatch gain, to deviation signal of water level that is output from the comparator 11, with a feed water controller 17 which outputs the adder signal being integration-processed as feed water flow demand signal, and with a specific feed water system which inputs flow demand signal of the feed water controller 17. Also, a suppression circuit 18 is newly provided to the feed water controller.