Development of an On-Line Expert System for Integrated Alarm Processing in Nuclear Power Plants

An on-line expert system, called AFDS (Alarm Filtering and Diagnostic System), has been developed to assist operators in effectively maintaining plant safety and to enhance plant availability using advanced computer technologies for alarm processing. The AFDS is designed to perform alarm filtering and overall plantwide diagnosis when an abnormal state occurs. in addition to these functions, it carries out alarm prognosis to provide the operator with prediction-based messages and to generate high-level alarms that can be used as another diagnostic information. The system is developed on a SUN SPARC 2 workstation, and its target domain is the alarm system in the main control room of Yonggwang units 1 and 2.