On monitoring nuclear power plant emergency diesel generator reliability
- Los Alamos National Lab., NM (United States)
- Nuclear Regulatory Commission, Washington, DC (United States)
If offsite power is interrupted, the availability of onsite alternating current power supplies is a major factor in assuring acceptable safety at commercial light-water-cooled nuclear power plants. To control the risk of severe care damage during station blackout accidents at a given plant, the reliability of the emergency diesel generators (EDGS) to start and load-run upon demand must be maintained at a sufficiently high level. The minimum EDG reliability, which we denote by RT, is targeted at either 0.95 or 0.975 per nuclear unit consistent with the reliability level that the plant operator assumed in the coping analysis for station blackout. In 1992 the US Nuclear Regulatory Commission (NRC) considered an amendment that would require licensees to test and monitor EDG reliability against performance-based criteria that indicate possible degradation from the EDG target reliability levels. They originally proposed the following set of fixed sample-size triggers for use in monitoring EDG reliability. The purpose of this report is to compare the performance of the proposed triggers with corresponding alternative sequential variable sample-size triggers which potentially permit earlier detection of EDG reliability degradation without significantly increasing the false alarm rate. The comparison is to be done in a simulated use environment by means of Monte Carlo simulation. We are also interested in the inverse conditional probabilities of reliability degradation given that a trigger has occurred.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- Nuclear Regulatory Commission, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10162838
- Report Number(s):
- LA-UR-93-1936; CONF-9308107-2; ON: DE93014359; CNN: Contract FIN LI836-3; TRN: 93:020851
- Resource Relation:
- Conference: Joint American Statistical Association (ASA), Institute of Mathematics Statistics and Biometric Society conference,San Francisco, CA (United States),8-12 Aug 1993; Other Information: PBD: 11 Aug 1993
- Country of Publication:
- United States
- Language:
- English
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