Development and Verification of a Plant Navigation System Displaying Symptom-Based Procedure

A plant navigation system has been developed to assist supervisors in nuclear power plants by automatically displaying the plant situation and plant operating procedures on a CRT screen when abnormalities occur. The goal suitable to the situation and the optimum operating procedures are automatically selected by using the diagnostic logic from the symptom-oriented procedure, on the basis of the current status of the plant, and are expressed by a flow and tree-type diagram like the problem analysis diagram. Verification tests have been performed twice using three scenarios, and the ability to maintain the quality for response to abnormalities by any type of supervisor has been confirmed.