ML19254B316
| ML19254B316 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 09/12/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Weigand J GULF STATES UTILITIES CO. |
| References | |
| NUDOCS 7909270308 | |
| Download: ML19254B316 (1) | |
Text
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UNITED STATES ga necoq'o, NUCLEAR REGULATORY COMMISSION O
/
,n REGION IV O
o 311 RYAN PLAZA DRIVE, SUITE 1000 e (r;
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,o September 12, 1979 In Reply Refer To:
RIV Docket Nos.
50-458/IE Bulletin No. 79-23 50-459/IE Bulletin No. 79-23 Culf States Utilities Attn:
Dr. J. G. Weigand General Marager, Nuclear Projects Post Office Box 2951 Beaumont, Texas 77704 Gentlemen:
Enclosed is IE Bulletin 79-23 which requires action by you with regard to your power reactor facilitica with an operating license or a construction permit.
Should you have questior ; regarding this IE Bulletin or the actions required of you, please contact this office.
Sincerely, p
/
Karl V. Seyfrit Director
Enclosures:
1.
List of IE bulletinc Issued in the Last Six Months 7909270 h
1046 035
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND EUFORCEMEHT WASHINGTON, D.C.
20555 IE Bulletin Fo. 79-23 Da t.c : September 12, 1979 Page 1 of 3 POTENTIAL FAILURE OF EMERGENCY DIESEL GDIERATOR FIELD EXCITER TRANSFORMER Description of Circumstarces:
Vlorida Dover and Light. Company recently reported a prob]c., encountered during
_ 24-hour full load test of the emergency diesel generat. ors (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 t. ripped due to a differential-relay lockout on E and C phasen; t.be B-EDG was manually stopped, thus interrupting the test at that point in time.
Subsequent investigation and testing by the licencee revealed a design 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 opi.lk: t: ik equipment installed at Turkey Point:
Emergency Diesel Generator General Motors (Electro-Motive Division)
Model EUD-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 recommendatiens regarding the chove problem are described below:
"A potential problem can exist if the n' DUPLICATE DOCUMENT the primary windings of the excitation j i
to as the control power transformer (CP' Entire document previously entered into system under:
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