ML19208C622
| ML19208C622 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 09/12/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7909270152 | |
| Download: ML19208C622 (1) | |
Text
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION n
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REGION 11 o
101 MARIETTA ST., N.W., SulTE 3100 ATLANTA, GEORGIA 30303
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o SEP 121979 In Reply Refer To:
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South Carolina Electric and Gas Company Attn:
T. C. Nichols, Jr., Vice President Power Production and System Operations P. O. Box 764 Columbia, South Carolina 29218 Gentlemen:
Enclosed is IE Bulletin 79-23 thtch requires action by you with regard to your power reactor facility (ies) with an operating license or a construction permit.
Should you have questionc regarding this Bulletin or the actions required of you, please contact this office.
Sincerely, h
y
'>k James P. O'Reilly Regional Director
Enclosures:
1.
List of IE Bulletins Issued in the Last Six Months e
1050 139 790927016>
Accession No. 7908220104 SSINS No.:
6820 UNITED STATEC 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 (EDG) at their
'Iurkey 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 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 ietuun are described below:
ji DUPLICATE DOCUMENT "A potential problem can exist if the nl E
Entire document previously entered the primary windings of the excitation j into system under:
to as the control power transformer (CP r
ANO b
No. of Pages:
1050 140 3- - m m u -
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