Reactor power controlling device

Purpose: To enable reactor power controlling, upon occurrence of abnormality in one control rod position indication system, while not inhibiting the control operation for all of the control rod but allowing the operation for the control rods in other normal control rod position indication systems, in the case where the reactor safety can be secured. Constitution: A control rod operation judging section is provided and, in a case where the position for a control rod becomes unclear, it is judged as to whether the reactor safety can be insured or not by the operation for the control rod intended to be operated based on the normal position data prior to the missing state and the present reactor core status. (Ikeda, J.)