Pressure controlling device for nuclear reactor

Purpose: To safely control the steam-pressure of a BWR-type reactor while monitoring the rate of change of the temperature of the coolant. Constitution: The steam-pressure of nuclear reactor is automatically controlled by controlling the amount of steam dumped to a condenser under the control of the opening of bypass valve of a turbine to maintain the limiting value of the rate of change of the coolant temperature while monitoring the coolant temperature rate. That is, a reactor pressure signal detected by a pressure detector is sent to a reactor pressure controlling device, the rate to change of the temperature of the coolant is calculated and output to a turbine pressure controller; thus the reactor pressure is safely controlled. (Yoshihara, H.)