Reliability of Emergency AC Power Systems at Nuclear Power Plants.

摘要

The report contains the results of a reliability analysis of the onsite AC power systems. Included is a design and operating experience review. Eighteen plants representative of typical onsite AC power systems and ten generic designs were selected to be modeled by fault trees. Operating experience data were collected from the NRC files and from nuclear plant licensee responses to a questionnaire sent out for this project. Important contributors to onsite power system reliability were identified, and the costs and improvement in reliability for modifications were estimated. Sensitivity of the onsite system unreliability to independent diesel generator failure, common-cause failure, and scheduled maintenance unavailability were analyzed, and costs of decreasing the probabilities of failure for these contributors were estimated. The important factors affecting onsite AC power system reliability were found to be dependent upon plant-specific features.