ML19208C574
| ML19208C574 | |
| Person / Time | |
|---|---|
| Site: | Sterling |
| Issue date: | 09/12/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Arthur J ROCHESTER GAS & ELECTRIC CORP. |
| References | |
| NUDOCS 7909270096 | |
| Download: ML19208C574 (1) | |
Text
{{#Wiki_filter:fn gi M* %,(o, t e UNITED STATES y y 3 s,( [,g NUCLEAR REGULATORY COMMISSION 3.'['[#%/.: [ 631 PARK AVENUE C REGION I 0, o KING OF PRUSSIA, PENNSYLVANIA 19406 .....o Docket No. 50-485 SEP 121973 Rochester Gas & Electric Corporation ATTN: Mr. J. E. Arthur Chief Engineer 89 East Avenue Rochester, New York 14649 Gentlemen: Enclosed is IE Bulletin 79-23 which requires action by you with regard to your power reactor facility (ies) with an operating license or a construction permit. Should you have questions regarding this Bulletin or the actions required of you, please contact this office. Sincerely, O. oyce H. Grier " Director
Enclosures:
1. IE Bulletin No. 79-23 2. List of IE Bulletins Issued in the Last Six Months cc w/encls: C. R. Anderson, Manager, QA Lex K. Larson, Esquire N. A. Petrick, Executive Director, SNUPPS Gerald Charnoff, Esquire 1049 342 '!9092700 %
ENCLOSURE 1 Accession No. 7908220104 SSINS No.: 6820 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 IE Bulletin No. 79-23 Date: September 12, 1979 Page 1 of 3 POTENTIAL FAILURE OF EMERGENCY DIESEL GENERATOR FIELD EXCITER TRANSFORMER Description of Circumstances: Florida Power and Light Company recently reported a problem encountered during a 24-hour full load test of the emergency diesel generators (EDG) at their Turkey Point facility. Approximately 10 hours into the test, the A-EDG tripped due to a differential-relay lockout on B and C phases; the B-EDG was manually stopped, thus interrupting the test at that point in time. Subsequent investigation and testing by the licensee revealed a design error on both the A and B EDGs which resulted in overheating of the Exciter Power Transformers (EPTs) at sustained high load operation. The following nameplate data applies to the equipment installed at Turkey Point: Emergency Diesel Generator General Motors (Electro-Motive Division) Model EMD-999-20 Engine-turbocharged, 2 cycle, EMD design 20-645E4 Generator-EMD-design Model A-20 Exciter Power Transformer GE-single phase Model-9T24Y1004 Serial-MD Cycles-60 KVA 15 Insulation-4160 V The manufacturer's findings and recomme. ~ are described below: DUPLICATE DOCUMENT Entire document previously entered into system under: ANO ) No. of pages:
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