ML19254B328
| ML19254B328 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 09/12/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Millen C PUBLIC SERVICE CO. OF COLORADO |
| References | |
| NUDOCS 7909270321 | |
| Download: ML19254B328 (1) | |
Text
CEllTRAL FILES ge acc NiiED STATES oq'o, NUCLEAR REGULATORY COMMISSION PR PDR:HQ
.l' 'W REGION IV Q I.
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September 12, 1979 Docket No. 50-267 Public Scrvice Company of Colorado ATTN:
Mr. C. K. Millen Senior Vice President P. O. Box 840 Denver, Colorado 80201 Gentlemen:
Enclosed is IE Bulletin 79-23 uhich reviires action by you with 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.
a.
Sincerely,
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- 1-
-s Karl V. Seyfrit Directir
Enclosures:
L.
'l.
List of IE Bulletins Issued in the Last Six Months c::
D. W. Warenbourg, Nuclear Production Manager Fo r t S t. Vrain Nuclear Station P.
O. Box 368 Platteville, Colorado 80651 L. Brey, Manager, Quality Assurance 1046 068 7900270 }f
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT g q()g,g,010 WASHINGTON, D.C.
20555 pf IE Bulletin No. 79-23 Date:
Septec.ber 12, 1979 Page 1 of 3 POTENTIAL FAILURE OF EMERGENCY DIESEL GENERATOR FIELD EXCITER TRid4SFORMER Description of Circumstances:
Florida Pawer 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 ustained 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-turbochtrged, 2 cyc1e, 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 findtags and recommendations regarding the cbove problem are described below:
"A potential problem can exist if t DUPLICATE DOCUMENT the primary windings of the excitat to as the control power transformer Entire document previous 1 entered into system under 1046 069
- D83M
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