Plant repairing aid device

The device of the present invention conducts treatments for repairing from abnormalities, together with an operator, upon occurrence of abnormalities of a plant. That is, repairing operation procedures depending on the cause of the abnormality are specified by an abnormality diagnosis section and generated by an operation procedure section. A break point execution and control section determines break points appropriately in generated operation procedures. The break point execution and control section gives contents for a series of operations between a certain break point to the next break point to a plant control section by an operator's allowance inspection. The plant control section executes the series of given operations. With such procedures, the operator's burden after occurrence of abnormalities is mitigated. In addition, the nuclear power plant capable of satisfying the required separation between a safety system and an unsafety system can be attained. (I.S.)