NRC Generic Letter 79-21, Enclosing NUREG/CR 0660, "Enhancement of on Site Emergency Diesel Generator Reliability"

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GL79021

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555

June 4, 1979

ALL POWER REACTOR LICENSEES

Gentlemen:

This letter is being sent to all licensees authorized to operated or construct a light water power reactor and to all applicants for a license to operate or construct a light water power reactor.

A review of the operating experience of the emergency diesel generators at light water reactors as reported in the Licensee Event ReportS (1969-1977)

indicates that their reliability could be improved.

The reliability of the diesel generator is strongly dependent on the interaction of the following factors: design, testing and operational requirements, operational history, inspections, maintenance, and the personnel qualifications of operators. To assist us in identifying any significant deficiencies the University of Dayton Research Institute, under our contract, prepared a report entitled "Enhancement of Onsite Emergency Diesel Generator Reliability" (NUREG/CR 0660) which identifies the major problems together with recommended corrective actions for improving reliability. We will review the report and evaluate each recommendation for its applicability to all licensees authorized to operate or construct light water power reactor by balancing the potential improvement in reliability versus the adverse impact of implementing the recommendation on the plants.

As a respondent to the generic questionnaire jointly prepared by the University of Dayton and NRC, we are enclosing (NUREG 0660) a copy of the University of Dayton Research Institute report. It should be noted that our review and evaluation of the report has not been completed. Comments on this report and other factors which may be considered major problems preventing improved onsite emergency diesel

.generator reliability are encouraged and should be forwarded to Fred Clemenson, Plant Systems Branch, Division of Operating Reactors, U. S. Nuclear Regulatory Commission, Washington, D.C. 20555


D. Eisenhut, Deputy Director Division of Operating Reactors

Enclosures:

Enhancement of Onsite Emergency Diesel Generator Reliability NUREG/CR 0660

cc w/o enclosure: Service List

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