ML20236A483
| ML20236A483 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 10/15/1987 |
| From: | Long W Office of Nuclear Reactor Regulation |
| To: | Trevors G NEBRASKA PUBLIC POWER DISTRICT |
| References | |
| TAC-66370, NUDOCS 8710220293 | |
| Download: ML20236A483 (2) | |
See also: IR 05000298/1986036
Text
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Docket No. 50-298
October 15, 1987
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Mr. George A. Trevors, Division
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Manager - Nuclear Support
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Nebraska Public Power District
Post Office Box 499
Columbus, Nebraska 68601
Dear Mr. Trevors:
.
SUBJECT: DIESEL GENERT0R SURVEILLANCE TESTING
Re:
Cooper Nuclear Station
In Inspection Report 50-298/86-36, the staff questions the frequency for
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surveillance testing of CNS's diesel generators for time to start and attain
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rated voltage and frequency. The staff has reviewed CNS Surveillance Procedures
6.3.12.6 Diesel Generator Annual Inspection, 6.3.12.1 Diesel Generator Operability
Test (Monthly Surveillance), and 6.3.4.3 Sequential Loading of Emergency Diesel
Generators. Our review indicates that the CNS diese! generator surveillance
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program may be inadequate with respect to ensuring ECCS capability in event of
a design basis LOCA with loss of offsite power.
Surveillance Procedure 6.3.4.3 does not appear to contain a pass / fail acceptance
criterion for time to start and attain rated voltage and frequency.
It only
tests the ECCS pumps timing delays as referenced to the time at which the DG
breaker closes on the bus. We therefore request your response to the following
questions.
(1) Is 6.3.4.3 intended to test the time interval between the
LOCA/LOSP signal and breaker closing (assuming breaker closing occurs at rated
voltage and frequency)? If not, which test is? (2) Is the 13 second period
indicated in Attachment 4 of the test procedure intended to be an acceptance
criterion? If so, what is the basis for the 13 second criterion as opposed to
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10 seconds which would be consistent with the USAR?
Your response is requested within 45 days.
If you have any questions please
contact me at 301-492-4754
The reporting and/or recordkeeping requirements contained in this letter affect
fewer than ten respondents; therefore, OMB clearnace is not required under P.L.96-511.
Sincerely,
8710220293 871015
William 0. Long, Project Manager
ADOCK 05000289
Project Directorate - IV
G
Division of Reactor Projects - III,
IV, V and Special Projects
cc:
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LTR NAME: DIESEL TESTING COOPER
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Mr. George. A. Trevors
Nebraska Public Power District
Cooper Nuclear Station
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- Mr. G. D. Watson, General: Counsel
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Nebraska Public Power District
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P. O. Box 499
LColumbus, Nebraska 68601
Cooper Nuclear Station
ATTN: .Mr. Guy R.-Horn, Division
'
Hanager of Nuclear Operations
.P. O. Box 98
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Brownville,' Nebraska 68321
Director
Nebraska. Department of Environmental
,
Control
P. 0. Box 94877-
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!
. State House Station
~~ Lincoln, Nebraska 68509-4877
Mr. William Siebert, Commissioner
'
Nemaha County Board of Commissioners
Nemaha County Courthouse
Auburn, Nebraska- 68305
Resident Inspector
U.S. Nuclear Regulatory Commission
P. O. Box 218
Brownville, Nebraska 68321
Regional Administrator, Region IV
.
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U.S. Nuclear Regulatory Commission
611 Ryan Plaza Drive, Suite 1000
Arlington, Texas
76011
Nr. Harold Borchart, Director
Division of Radiological Health
Department of Health
301 Centennial Mall, South
P. O Box 95007
Lincoln, Nebraska 68509