ML20082J063
| ML20082J063 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 08/20/1991 |
| From: | Cottle W ENTERGY OPERATIONS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GNRO-91-00151, GNRO-91-151, NUDOCS 9108270130 | |
| Download: ML20082J063 (2) | |
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Operations August 20, 1991 U.S. Nuclear Regulatory Commission Mail Station Pi-137 Washington, D.C.
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Attention: Document Control Desk
SUBJECT:
Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 Special Report Commitment Revision to Special Report 90-003 GNR0-91/00151 Gentlemen:
On December 27, 1990, Entergy Operations reported a valid failure on the Division I Emergency Diesel Generator (SR 90-003).
Subsequent to that failure, another valid failure occurred on May 13, 1991 which was reported in SR 91-004. During root cause analysis for the subsequent failure, it was determined that the failure was a result of degraded lubricant between contact surfaces on the voltage regulator relay bridge selector switch.
In SR 90-003, Entergy Operations committed to inspect the carbon brush and the slip rings on a quarterly frequency and to periodically cycle the voltage regulator bridge relay selector switch. Based on the cause analysis of the subsequent failure, the committed actions in SR 90-003 will no longer be required.
Therefore, the commitment will be revise 6.
The carbon brushes and slip rings inspection will be returned to their original frequency.
Yours truly, wy w.-
WTC/JHTA/cc ac:
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f August 20, 1991 GNRO-91/00151 Page 2 of 2 cc:
Mr. D. C. Hintz Mr. J. L. Mathis Mr. R. B. McGehee Mr. N. S. Reynolds Mr. H. L. Thomas Mr. F. W. Titus Mr. Stewart D. Ebneter Regional Administrator U.S. Nuclear Regulatory Commission Region 11 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30323 Mr. P. W. O'Connor, Project Manager Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 11021 Washington, D.C.
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