A study of a fault diagnosis method using influence diagrams

In complex systems, it is necessary to model a logical representation of the overall system interaction with respect to the individual subsystems. In this study the influence diagram has been especially applied for modeling EOPs (Emergency Operating Procedures) and fault process for a strange event. Fuzzy logic is also used for quantification and selection of the probable success path in systems under abnormal situations in order to diagnose the faults and to analyze causes of the situations. This methodology using Influence Diagrams and Fuzzy theory has been applied for representing the dependency behavior (feedback and dependency, etc) and uncertain behaviors of complex systems. In this study, a methodology to diagnose the confusing faults such as SGTR and SBLOCA has been introduced and applied.