ML19254B323
| ML19254B323 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 09/12/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Aswell D LOUISIANA POWER & LIGHT CO. |
| References | |
| NUDOCS 7909270313 | |
| Download: ML19254B323 (1) | |
Text
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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l' 'i REGION IV 7
o 611 RY AN PLAZA DRIVE, SUITE 1000 5, '
/.:. j ARLINGTON, TEXAS 76012
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September 12, 1979 In Reply Refer To:
RIV Docket No.
50-382/IE Bulletin No. 79-23 Louisiana Power and Light Co.
ATTN:
Mr. D. L. Aswell Vice President of Power Production 142 Delaronde Street New Orleans, Louisiana 70174 Gentlemen:
Enclosed is IE Bulletin 79-23 which requires action by you uith regard to your power reactor facility with an operating license or a construction permit.
Should you have questions regarding this IE Bulletin or the actions required of you, please contact this office.
Sincerely,
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t Karl V. Seyfrit Director f
Enclosures:
1.
List of IE Bulletins Issued in the Last Six Months 7909270 4
1046 060
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-23 Date:
September 12, 1979 Page 1 of 3 POTENTIAL FAILURE OF EMERGENCY DIESEL GENERATOR FIELD EXCITER TRANSFORMER Description of Circumstances:
Florida Power and Light Company recently reported a problea 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 cianufacturer's findings and recommendations regarding the above problem are described below:
um "A potential problem can exist if the nc DUPLICATE DOCUMENT the primary windings of the excitation I to as the control power transformer (CP']
Entire document previously entered into system under:
b ANO 1046 oft m
No. of pages: