ML19208C620
| ML19208C620 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 09/12/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7909270149 | |
| Download: ML19208C620 (1) | |
Text
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r UNITED STATES
'o*t NUCLEAR REGULATORY COMMISSION a e REGION 11 g
/[
101 MARIETTA ST., N.W., SUITE 3100 o,
ATLANTA, GEORGIA 30303 SEP 121979 In Reply Refer To:
1pk RII:JPO QO-395' South Carolina Electric and Gas Company Attn:
M. C. Johnson, Vice President Special Services and Purchasing P. O. Box 764 Columbia, South Carolinc 29218 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, Y h k
'2 James P. O'Reilly Regional Director
Enclosures:
1.
List of IE Bulletins issued in the Last Six Months 7909270i97 1050 135
SEP 121979 e
South Carolina Electric and Gas Company cc w/ enc 1:
T. B. Conners, Jr.
Conners, Moore and Corber 1747 Pennsylvania Avenue, N.W.
Washington, D.C.
20006 A. A. Smith Quality Assurance Post Office Box 8 Jenkinsville, South Carolina 29065 O. S. Bradham, Manager Nuclear Operations Post Office Box 8 Jenkinsville, South Carolina 29065 g
1050 136
Accession 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 (EDG) 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 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 recommen are described below:
, DUPLICATE DOCUMENT "A potential problem can exist if the ne lEntire document previously entered the primary windings of the excitation pl 'nto system under:
to as the control power transformer (CPT No. of pages:
7 1050 137 4ea: = = a _ ~ a