ML19208C570
| ML19208C570 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 09/12/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Tallman W PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| References | |
| NUDOCS 7909270090 | |
| Download: ML19208C570 (1) | |
Text
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o UNITED STATES E '% s, d'. i NUCLEAR REGULATORY COMMISSION i j%d
,c REGION I Os ' f4 g
631 PARK AVENUE D
KING OF PRUSSIA, PENNSYLVANIA 19406
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,o Dockei Nos. 50-443 50-444 SEP 121979 Public Service Company of New Hampshire ATTN:
Mr. W. C. Tallman President 1000 Elm Street Manchester, New Hampshire 03105 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, xfe^&. L~
oyce'H. Grier
' Director
Enclosures:
1.
List of IE Bulletins Issued in the Last Six Months cc w/encls:
John D. Haseltine, Project Manager 790927doW 1044 039
ENCLOSURE 1 Accession No. 790822010.4 -
SSINS No T 6020 ' '
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHI% TON, D.C.
20555 IE Bulletin No. 79-23 Date:
September ]2, 1979 Page 1 of 3 POTENTIAL FAILURE OF EMERGENCY DIESEL GENERATOR FIELD EXCITER TRANSF0PMER 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 tileir 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 re: lay lockout on B and C phases; the B-EDG was manually stopped, thus inte.*rupting the test at that point in time.
Subsequent investigation and testing by the licensee revealed a desig, 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 Insulatior-4160 V The manufacturer's findings and recommendations regarding the above problem are described below:
DUPLICATE DOCUMENT Entire document previously entered into system under:
7hAPM/
l 1042 040
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