A sequential trigger procedure for use in monitoring nuclear power plant emergency diesel generator reliability
The reliability of onsite emergency alternating current (ac) power supplies is a major factor in assuring acceptable safety at light-water-cooled nuclear power plants. The NRC has determined that an amendment to 10 CFR 50.63, ``Station Blackout,`` is the appropriate means for imposing new requirements regarding electric diesel generators (EDG) reliability. The proposed rule and regulatory guide consists of the following fundamental elements: (1) establishment of EDG target reliability levels that would comport with the reliability levels assumed in a licensee`s coping analysis for station blackout; (2) trigger values with respect to EDG failures to start and loadrun which serve two purposes -- to provide a warning of EDG degradation, and to provide a basis for taking regulatory action when there is reasonable evidence from surveillance testing that EDG reliability has degraded below the selected target values; and (3) a reporting regime for EDG failures consistent with this performance-based approach. The purpose of this report is to assess the performance of the proposed triggers in a simulated operational environment and to describe and evaluate an alternative trigger procedure which improves the detection of EDG reliability degradation without increasing false alarms.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- Nuclear Regulatory Commission, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10106458
- Report Number(s):
- LA-UR--92-3280; CONF-9210222--1; ON: DE93003703
- Country of Publication:
- United States
- Language:
- English
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On monitoring nuclear power plant emergency diesel generator reliability
On monitoring nuclear power plant emergency diesel generator reliability
Related Subjects
210100
210200
210700
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900
BLACKOUTS
BWR TYPE REACTORS
COMPLIANCE
COMPUTERIZED SIMULATION
ELECTRIC GENERATORS
FAILURES
NUCLEAR POWER PLANTS
PERFORMANCE
POWER REACTORS
NONBREEDING
LIGHT-WATER MODERATED
BOILING WATER COOLED
POWER REACTORS
NONBREEDING
LIGHT-WATER MODERATED
NONBOILING WATER COOLED
PWR TYPE REACTORS
REACTOR SAFETY
REGULATION AND LICENSING
REGULATIONS
RELIABILITY
REPORTING REQUIREMENTS