ML19208C611
| ML19208C611 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 09/12/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stewart W FLORIDA POWER CORP. |
| References | |
| NUDOCS 7909270136 | |
| Download: ML19208C611 (2) | |
Text
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION o
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.r REGION 11 o,
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101 MARIETTA ST., N.W., SUITE 3100
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RII:JPO QW302; Florida Power Corporation Attn:
W. P. Stewart, Manager Nuclear Operations P. O. Box 14042, Mail Stop C-4 St. Petersburg, Florida 33733 Gentlemen:
Enclosed is IF 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
> NMV James P. O'Reilly Regional Director
Enclosures:
1.
List of IE Bulletins Issued in the Last Six Months 1050 114 7909270/36
SEP 121979 Florida Power Corporation,
cc w/ encl:
G. P. Beatty, Jr.
Nuclear Plant Superintendent Post Office Box 1240 Crystal River, Florida 32629 4
1050 115
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 nei Entire document Previously the primary windings of the excitation p' entered into system under-to as the control power transformer (CPT ANO f
1050 116 No.
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