Pressure control device in an atomic power plant

Object: To uniformly provide an optimum control characteristic from low output to high output. Structure: A pressure control device in an atomic power plant comprising a pipe line for guiding steam generated in a reactor to a turbine, a regulating valve mounted on the pipe line, and an adjuster for compensating at least lead and lag with respect to a deviation between signal for setting vapor pressure within the pipeline and signal for detecting vapor pressure, an opening of the regulating valve being controlled according to output of the adjuster, the improvement including means for correcting lead and lag time of the adjuster by signals according to the output of the reactor. (Kamimura, M.)