ML19254B327
| ML19254B327 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 09/12/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | William Jones OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 7909270320 | |
| Download: ML19254B327 (1) | |
Text
CENTRAL FILES UNITED STATES PDR:HQ j F'o Pic %
NUCLEAR REGULATORY COMMISSION n
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REGION IV n
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ARLINGTON, TEX AS 76012
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, c-Sep tember l2,1979 Docket No. 50-285 Omaha Public Power District ATTN:
W. C. Jones, Division Manager -
Production Operations 1623 Harney Street Omaha, Nebraska 68102 Gentlemen:
Enclosed is IE Bulletin 79-23 which requires 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.
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Sincerely,
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- '- v' Karl V. Seyfrit
,l Director
Enclosures:
1.
List of IE Bulletins Issued in the Last Six Months cc:
S. C. Stevens, Manager Fort Calhoun Station Post Office Box 98 Fort Calhoun, Nebraska 68102
'1046 066 79092703
UNITEP GTATES NUCLEAR REGUU
- 0RY COMMIl:SION OFFICE OF INSPECTluJ A10 EHFORCDIENT WASHINGTON, D.C.
20355 IE Bulletin No. 79-23 Da t.c : September 12, 1979 Page 1 of 3 POTENTIAL FAILURE OF EMERGENCY DIESEL GEtFf]ATOR TIELD EXCITER TRANSFORMER Description of Circumstances:
Florida Power and Light Company recently reported a proble:s encountered during a 24-hour full load test of the emergency dier.el generators (EDG) at their Turkey Point facility. Approximately 10 hourr; into the test, the A-EDG tripped due to a differential-relay lockout on B.r4 C phases; the B-EDG was manually stopped, thus interrupting the test at the. point in time.
Subsequent investigation and testing by the licen :ce revealed a deaign error on both the A and B EDGs which resulted in werheating of the Exciter Power Transformers (EPTs) at sustained high load operation.
The following nameplate data applies to tLe 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 Pouer Transformer GE-single phase Model-9T24Y1004 Serial-MD Cycles-60 KVA 15 Insulation-4160 V The manufacturer's findings and recommendationc regarding the above problem are described below:
"A potential problem can exist if the n the primary windings of the excitation I DUPLICATE DOCUMENT to as the control power transformer (CP1 Entire document previously entered into system under:
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