ML17249A332
| ML17249A332 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 10/19/1979 |
| From: | White L ROCHESTER GAS & ELECTRIC CORP. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-23, NUDOCS 7912140047 | |
| Download: ML17249A332 (4) | |
Text
ROCHESTER GAS AND ELECTRIC CORPORATION Kk1 ~ d ~ I
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S9 EAST AVENUE, ROCHESTER, M.Y. 14649 I.EON D. WHITE, JR.
VICC PRCSIDCNT ZKI.KPHONC ARCA CODK 7ld 546.2700 October 19, 1979 Mr. Boyce H. Grier, Director U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406
Subject:
IE Bulletin No. 79-23, Potential Failure of Emergency Diesel Generator Field Exciter Transformer R. E. Ginna Nuclear Power Plant, Unit 41 Docket No. 50-244
Dear Mr. Grier:
In response to Inspection and Enforcement Bulletin 79-23 concern-ing a recent problem at Turkey Point with an emergency Diesel generator field exciter transformer, the following information is provided.
Diesel generator circuitry and load testing history have been re-viewed by the Electrical Foreman and the Operations Engineer at Ginna Station.
W'e do pot have a connection between our high KVA generator and low KVA rated transformers.
The Ginna Plant Technical Specifications for periodic testing limit maximum loading of the emergency generators to 1950 kw; however, the short term load testing required by the bulletin has been accomplished during the conduct of acceptance and startup testing of equipment at Ginna Station.
At that time the emergency generators were load tested for half an hour at their half hour maximum rating of 2300 kw and then the test was continued for an additional one and a half hours at the two hour rating of 2250 kw.
Concerning long term running of the emergency generators, their history indicates several times in which they have been run continuously for up to 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> during scheduled auxiliary transformer maintenance, supplying required house load.
To accomplish the long term load testing required by the bulletin, a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> load test at the nominal long term rated load (1950 kw) will be scheduled before the end of the next refueling outage.
TOZEIL40 Qqp p
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ROCHESTER GAS AND ELECTRI~RP.
DATE October 19, 1979~
Mr. Boyce H. Grier, Director SHEET NO.
A proposal to change the Plant Technical Specifications to allow periodic testing at a load which may exceed 1950 kw for less than two hours was submitted November 21, 1977.
Very truly yours, grig%,
L. D. Wh e, Jr.
xc:
U. S. Nuclear Regulatory Commission.
Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D. C.
20555
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