ML19254B311
| ML19254B311 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/12/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 7909270304 | |
| Download: ML19254B311 (1) | |
Text
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September 12, 1979 Docket Nos.
50-313 50-368 Arkansas Power and Light Company ATTN:
Mr. William Cavanaugh III Vice President of Generation and Construction P. O. Box 551 Little Rock, Arkansas 72203 Gentlemen:
Enclosed is IE Bulletin 79-23 which 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,
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,&l-Karl V. Seyfrit fi Director j
Enclosures:
1.
List of IE Bulletins Issued in the Last Six Months James P. O'Hanlon, Plant Manager cc:
Arkansas Nuclear One P. O.
Box 608 Russellville, Arkansas 72801 1046 02g M
7900270 C
UNITED SfATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMEliT WASHINGTON, D.C.
20555 IE Bulletin No. 79-23 Date:
Septenber 12, 1979 Page 1 of 3 POTENTIAL FAILURE OF EMERGENCY DIESEL GENERATOR FIELD EXCITER TPM SFORMER Description of Circumstances:
Florida Power and Light Company recently reported a problen encountered durinn 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 E:: citer Power Transformers (EPTs) at sustained high load operation.
The following nameplate data applies to the equipaent 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 Insulation-4160 V The manufacturer's findings and recommendations regarding the above problem are described below:
"A potential problem can exist if the neu DUPLICATE DOCUMENT the primary windings of the excitation po to as the control power transformer (CPf)
Entire document previously entered into system under:
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