A study on continuous monitering and self-started diagnosis with signal validation using DISKET

One of key issues in the application of expert system technology for transient diagnosis to real nuclear power plant is continuous monitering and self-started diagnosis with signal validation. A method to realize this function has been proposed and verified using DISKET system developed by JAERI. A simulation system for on-line diagnosis has first been built on the main frame computer at JAERI. The function to moniter plant status continuously and to start a transient diagnosis triggered by the early fault detection was realized in DISKET using rule representation. The signal validation function was also implemented as the rules which represent the normal relationship between main plant parameters and alarms. The diagnosis of some tipical transients with these rules has been performed for the verification study. In this results, these functions were successfully demonstrated. (author)