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