ML19208C605
| ML19208C605 | |
| Person / Time | |
|---|---|
| Site: | Catawba, Perkins, Cherokee  |
| Issue date: | 09/12/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Dail L DUKE POWER CO. |
| References | |
| NUDOCS 7909270126 | |
| Download: ML19208C605 (2) | |
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION o
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101 MARIETTA ST., N.W., SulTE 3100
%,*****,o ATLANTA.OEORGIA 30303 SEP 121979 TAa. it In Reply Refer To:
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Duke Power Company Attn:
L. C. Dail, Vice President Design Engineering P. O. Box 33189 Charlotte, North Carolina 28242 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, h
y k
'2 James P. O'Reilly Regional Director
Enclosures:
1.
List of IE Bulletins Issued in the Last Six Months
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SEP 121979 Duke Power Company.
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D. G. Beam, Project Manager Post Office Box 223 Clover, South Carolina 29710 J. T. Moore, Project Manager Post Office Box 422 Gaffney, South Carolina 29340 a
1050 104
4 Accession No. 7908220104 SSINS ho.:
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 oserheating of the Exciter Power Transformers (EPTs) at sustained high load operation.
The following nameplate data applies to the enuipment 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 recommend N
1 are described below:
DUPLICATE DOCUMENT f
"A potential problem can exist if the neut Y
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the primary windings of the excitation p I entered into systen-Tel to as the control power transformer (CPT),
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