ML19254B330
| ML19254B330 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 09/12/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Gary R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| References | |
| NUDOCS 7909270324 | |
| Download: ML19254B330 (1) | |
Text
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en nec UNITED STATES
- g oq[o, NUCLEAR REGULATORY COMMISSION O'
. n REGION IV 3
0 611 RYAPJ PLAZA DRIVE, SUITE 1000 2
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ARLINGTON, TEXAS 76012 Po
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September 12, 1979 In Reply Refer To:
RIV Docket Nos.
50-445/IE Bulletin No. 79-23 50-446/IE Bulletin No. 79-23 Texas Utilities Generating Company ATTN:
Mr. R. J. Gary, Executive Vice President and General Manager 2001 Bryan Tower Dallas, Texas 75201 Gentlemen:
Enclosed is IE Bulletin 79-23 uhich requires action by you with regard to your power reactor facilities 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,
/
[S?
'Karl V. Seyfrit Director
Enclosures:
1.
List of IE Bulletins Issued in the Last Six Months 1046 072 7009270
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 POIENTIAL 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 d2e 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 GC-single phase Model-9T21Y1004 Serial-MD Cycles-60 KVA 15 Insulation-4160 V The manufacturer's findings and recommendations regarding the above problem are described below:
"A potential problem can exist if the neutr DUPLICATE DOCUMONT the primary windings of the excitation powe to as the control power transformer (CPT))
Entire document previous 1 entered into system under 190121632j-/
^m 1044 073 no. of pages: