ML19208C677
| ML19208C677 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 09/12/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| References | |
| NUDOCS 7909270218 | |
| Download: ML19208C677 (1) | |
Text
pm atcoq'o, UNITED STATES NUCLEAR REGULATORY COMMISSION
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REGION 111
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o, 799 ROOSEVELT ROAD GLEN ELLYN. ILLINOIS 60137 12 Ny Docket No. 50-440 Docket No. 50-441 The Cleveland Electric Illuminating Company ATTN:
Mr. Dalwyn R. Davidson Vice President - Engineering P. O. Box 5000 Cleveland, OH 44101 Gentlemen:
Enclosed is IE Bulletin No. 79-23 which requires action by you with regard to your power reactor facilities with an operating license or a construction permit.
Shauld you have questions regarding this Bulletin or the actions required of you, please contact this office.
Sincerely, Qb$~fA VJamesG.Kepp$er%
Director
Enclosure:
IE Bulletin No. 79-23 cc w/ encl:
~
Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Harold W. Kohn, Power Siting Commission Mr. Daniel D. Wilt, Attorney 1049 102 7909270
A# cession No. 7908220104 SSINS No.:
6820 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 September 12, 1979 IE Bulletin No. 79-23 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 (EOG) at their Turkey Point facility.
Approximately 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> into the test, the A-EDG tripped due to a differential-relay lockout on B and C phases; the B-EDG was manually stepped, 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-9124Y1004 Serial-MD Cycles-60 KVA 15 Insulation-4160 V The manufacturer's findings and recommendations regarding the above problem are described below:
"A potential problem can exist if the neut tire primary windings of the excitation pow DUPLICATE DOCUMENT to as the control power transformer (CPT))
Entire document previously entered into system under:
nuo 99092.20I64
.1049 103 no. or geges:
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