ML19208C680
| ML19208C680 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point, Palisades File:Consumers Energy icon.png |
| Issue date: | 09/12/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Dewitt R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 7909270222 | |
| Download: ML19208C680 (1) | |
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UNITED STATES E"
NUCLEAR REGULATORY COMMISSION m
E REGION lil a
U[
799 ROOSEVELT ROAD S
GLEN ELLYN. ILLINOIS 60137 o
W 12 upr Docket No. 50-155 Docket No. 50-255 Consumers Power Company ATTN:
Mr. R. B. DeWitt Vice President Nuclear Operations 212 West Michigan Avenue Jackson, MI 49201 Gentlemen:
Enclosed is IE Bulletin No. 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 Bulletin or the actions required of you, please contact this office.
Sincerely, CL u % }& -n0w
%mesG.KdpTer Director
Enclosure:
IE Bulletin No. 79-23 cc w/ encl:
Mr. C. J. Hartman, Plant Superintendent Mr. J. G. Lewis, Manager Central Files Director, NRR/0PM Director, NRR/ DOR PDR Local PDR NSIC TIC Ronald Callen, Michigan Public Service Commission Anthony Roisman, Esq., Attorney Myron M. Cherry, Chicago 1049 123 7909270
Accession No. 7908220104 SSINS No.:
6820 UNITED STATE',
NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORJEMENT WASHINGTON, [,.C.
20555 September 12, 1979 IE Bulletin No. 79-23 POTENTIAL FAILURE OF EMERGENCY DIESEL GENERATOR FIELD EXCITER TRANSFORMER Description of Circumstances:
Florida Power and Light Company recently reported a problam encountered during a 24-hour full load test of the emergency diesel generators (EDG) at their Turkey Point facility.
Approxinately 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 tnat 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 MA 15 Insulation-4160 V The manufacturer's findings and recommendations regarding the above problem are described below:
"A potential problem can exist if the n.
the primary windings of the excitation 1 DUPLICATE DOCUMENT to as the control power transformer (CP' Entire document previously l
entered into system under:
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