ML19208C725
| ML19208C725 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 09/12/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 7909270282 | |
| Download: ML19208C725 (1) | |
Text
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,lL NUCLEAR REGULATORY COMMISSION
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September 12, 1979 Docket flo. 50-344 Portland General Electric Company 121 S. W. Salmon Street Portland, Oregon 97204 Attention: Mr. Charles Goodwin Assistant Vice President 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, flS?
db5-R. H. Engelken Director
Enclosures:
1.
IE Bulletin flo. 79-23 2.
List of IE Bulletins Issued in the Last Six Months cc w/ enclosures:
C. P. Yundt, PGE F. C. Gaidos, PGE 1049 201 7909270 787
Accession fio. 7903220104 SSINS fio.:
6820 UNITED STATES frJCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION Afl0 ENFORCEMENT WASHIf4GTON, D.C.
20555 September 12, 1979 IE Bulletin No. 79-23 POTENTIAL FAILURE OF EMERGEi4CY DIESEL GENERATOR FIELD EXCITER TRANSFORMER De_scriotion of Circumstar.ces:
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 resultec' in overheating of the Exciter Power Transformers (EPTs) at sustained high laad operation.
The following nameplate data applies to the equipment installed at Turkey Point:
Emergency Diesel Generator General Motors (Electro-Motive Division) flodel EMD-999-20 Engine-turbocharged, 2 cycle, EMD design 20-645E4 Generator-EllD-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 recommendations regarding the above problem are described below:
"A potential problem can exist if the nn.ral of the generator and the neutral of the primary windings of the excitatic to as the control power transformer (
DUPLICATE DOCUMENT between the neutrals, or a connectior are equally undesirable conditions.
Entire document previously ditions exist, high circulating curr(
entered into system under:
currents may exceed transformer ratir Silure.
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no or pases:
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