ML19254B321
| ML19254B321 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 09/12/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Eric Turner HOUSTON LIGHTING & POWER CO. |
| References | |
| NUDOCS 7909270311 | |
| Download: ML19254B321 (1) | |
Text
.
o UNITED STATES
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NUCLEAR REGULATORY COMMISSION yN
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REGlcN IV l
I o 611 RYAN PLAZ A DRIVE,0,UITE 1000
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ARLINGTON, TEXAS 76012
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h Septexter 12, 1979 g
In Reply Refer To:
RIV Dochet Nos. 50-498/IE Bulletin No. 79-23 50-499/IE Bulletin No. 79-23 Houston Lighting & Power Co:npany ATTN:
Mr. E. A. Turner, Vice President Power Plant Construction and Technical Servicco Post Of fice Box 1700 Houston, Texas 77001 Centlemen:
Encloaed is IE Bulletin 79-23 which rm ires action by yoit with regard to your power reactor facilities with an operating license or a construction permit.
Should you have questions regarding this IE Btfletin or the actions required of you, please contact this office.
Sincerely,
(
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pf j[GP'Jk
,X V. Seyfrit Dircctor l
Enclosures:
1.
L st of IE Balletins issued in the Last S.ix Monthe 1046 056 r
j 790927 I
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-23 Date:
September 12, 1979 Page 1 of 3 POTENTIAL FAILURE OF EMERGENCY DIESZL GENERATOR FIELD EXCITER TRANSFORMER Description of Circumstances:
Florids 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 mar.ually 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 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 Insulation-4160 V The manufacturer's findings and recommendations regarding the above problem are described below:
"A potential problem can exist if the ne
' ' ~~ '-
the primary windings of the excitation p DUF. MTE DOCUMENT to as the control power transformer (CPT Entire cocument previously entered into system under:
ANO D [2.2d[d No. of pages:
10M 057
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