Water supply control means for a boiling water reactor

Object: To enhance response character at the time of rendering the reactor water level constant by adding a speed difference signal from a recirculation speed control system and an output signal from a preset pressure adjuster as input signals to a three-element control system. Structure: A water supply control system is constructed such that five different inputs, namely the water level of reactor, rate of vapor flow, rate of water supply, deviation of recirculating pump speed and output of a preset pressure adjuster, are used as control input signals for carrying out linear and integral operations in a water supply controller, the output of which is used to control the water supply control valve. By imparting the system with a feed forward function it is possible to obtain excellent response characteristics in both manual and automatic load follow controls irrespective of use or non-use of the preset pressure adjuster. (Kamimura, M.)