The Diagnostic Graphical User Interface (DGUI), installed at a large nuclear power plant in the midwestern United States, is described. Since 1988, the power plant has been using the Generator Artificial Intelligence Diagnostics (GenAID) system, which provides online diagnostic capability for the generator and generator auxiliaries through a plant data center and communication link to the diagnostic operations center. The graphical interface represents a significant improvement over existing technology by providing the power plant control room operator with the capability of interacting directly with the diagnostic system. Providing the operator with the key variables that support a diagnosis made by the expert system increases the operator's understanding and confidence in the diagnosis. Recommendations are provided by the system to guide operator actions. Trending capability is provided for operator-selectable sensor points. The highlighted areas on the graphic screens provide identification of problem components in the system equipment being diagnosed.
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