On-line power plant alarm and disturbance analysis system. Final report. [PWR; BWR]

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Abstract
A methodology for on-line diagnosis of power plant disturbances has been developed, implemented, and tested. The approach is sufficiently comprehensive to enable a wide variety of disturbances to be analyzed correctly and efficiently. Cause-consequence analysis is used as the main analysis technique. The method has been implemented on commonly available process computers and integrated with a PWR training simulator. Disturbance models for two selected plant subsystems, the feedwater control system and the component cooling water system, have been developed and implemented as the data base for the disturbance analysis system (DAS). The resulting demonstration system has been evaluated from both a technical and performance point of view by simulating the chosen disturbances on the simulator. By testing the operators' ability to operate the simulator during disturbances with and without the assistance of the DAS, it has been shown that a DAS can be an important contributor to the improvement of the availability of nuclear power plants.

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