Fast Cold Starts of Diesel Generators (Generic Letter 83-41)
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D. C. 20555
December 16, 1983
TO ALL LICENSEES OF OPERATING REACTORS
SUBJECT: FAST COLD STARTS OF DIESEL GENERATORS
(Generic Letter 83-41)
Widespread concern has been expressed by the industry that fast cold start
surveillance testing of diesel generators (i.e., starts with rapid
acceleration and loading without prelubrication and warmup) may result in
premature diesel engine degradation. The NRC staff is also concerned about
the possible deleterious effects of fast cold starts on diesel generators.
However, we require additional information about the extent and effects of
this practice before we can make a determination as to whether the number of
fast cold starts should be reduced.
Accordingly, we are requesting your voluntary participation in providing
responses to the following questions:
1. How many times in the past year (December 1, 1982 to December 1, 1983)
have your emergency diesel generators been subjected to a fast cold
start (without prelubrication and warmup of any moving parts of the
diesel generators)? Provide your data on a per machine basis, for each
of the following three categories: (a) surveillance testing, (b)
maintenance activities, and (c) actual demands.
2. What is your assessment of the effects of frequent fast cold starts on
diesel generator reliability and availability? Do you believe that
they significantly degrade reliability and availability?
This request for information was approved by the Office of Management And
Budget under clearance number 3150-0011 which expires April 30, 1985.
Comments on burden and duplication may be directed to the Office of
Management and Budget, Reports Management Room 3208, New Executive Office
Building, Washington, D.C. 20503.
As the results of this effort will be used to make selected licensing
decisions, we request your responses be received by the staff prior to
January 6, 1984. The results of this and other efforts will be factored
into our diesel generator reliability program. Your participation in this
data collection effort is appreciated.
Darrell G. Eisenhut, Director
Division of Licensing
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