ML20128E868
| ML20128E868 | |
| Person / Time | |
|---|---|
| Issue date: | 02/02/1993 |
| From: | Correia R Office of Nuclear Reactor Regulation |
| To: | Zech G Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9302110123 | |
| Download: ML20128E868 (2) | |
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MEMORA!1DUM FOR:
Gary G. Zech, Chier Performance and Quality Evaluation Branch Division of Reactor Inspection and Licensee Performance FROM:
Richard P. Correia, 11RC Coordinator for NRC/NUMARC Maintenance Interactions Performance and Quality Evaluation Branch Division of Reactor Inspection and Licenset Performance
SUBJECT:
14UMARC PROPOSED EDG REllABillTY ADDITION TO MAlll1EllANCE GUIDElll4E NUMARC has forwarded, for our review and comment, a proposed addition to the NUMARC maintenante rule implementation guideline, 93-01, revision 2A. The addition is to provide guidance to the industry for incorporating into the maintenance rule implementation process the commitments from the station blackout rule coping analysis for EDG reliability trigger values.
OrWaal signed by Richard P. Correia, NRC Coordinator.
for NRC/NUMARC Maintenance Interactions Performance and Quality Evaluation Branch Division of Reactor inspection and Licensee Performance DISTRIBUT10ti:
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An example where reliability and unavailability could be used as the performance criteria is the emergency diesel generator (EDG). An acceptab!c approach would be to use the methodology in Appendix D (EDG Reliability Program) of NUMARC 87-00, Rev.1, " Guidelines and Technical Bases for NUMARC Initiatives Addressing Station Blackout at Light Water Reactors" which details the process for maintaining and monitoring diesel performance consistent with the trigger values identified in Initiative SA. Udlities have docketed commitments to maintain the EDG reliability tarEet (0.95 or 0.975) used in the coping analysis required by the Station Blackout Rule,10 CFR 50.63.
In 10 CFR 50.65(n)(3) the utility is required to balance the objectives of preventing failures (i.e., reliability) and minimizing unavailability due to monitoring or preventive maintenance (see also Section 12.2.4). The unavailability (or availability) values assumed in the plant specific D'E could also be used as performance criteria for the EDGs.
IF AGREEMENT IS REACHED, COULD BE INSERTED AS TillRD PARAGRAPH IN SECrlON 9.3.2 (PERFORMANCE CRrlERIA FOR EVALUATING SSCs)
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