ML19344E558
| ML19344E558 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/22/1980 |
| From: | Hovey G METROPOLITAN EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-23, TLL-415, NUDOCS 8009020241 | |
| Download: ML19344E558 (2) | |
Text
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muu Metropolitan Edison Comoary Post Ofide Box 4E0 4-g Midatetown. Pennsylvama UOF II 717 9444041 wnter's Dmact D'al Nece August 22, 1980 TLL 415 Office of Inspection and Enforcement Attn:
Mr. Boyce H. Grier, Director Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Sir:
Three Mile Island Nuclear Station, Unit 2 (TMI-2)
Operating License No. DPR-73 Docket No. 50-320 IE Bulletin 79-23 This is in response to IE Bulletin 79-23 and is being submitted subsequent to our letter of July 9, 1980 (TLL 335).
The subject bulletin, " Potential Failure of Emergency Diesel Generator Field Exciter Transformer", concerns a possible overloading condition when the neutrals of the generator and the primary winding of the Exciter Power Transformer (EFT) are connected. This condition may cause high circulating currents, possibly resulting in exceeding the transformer ratings and damage to the transformer.
We have reviewed the circuitry of our Emergency Diesel Generators (EDG's) and determined that a connection between the neutrals of the generator and the primary winding of the EPT does not exist.
A full load operational test of a duration of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> was performed as re-quired in item 2.
The EDG's were operated for a total of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> l
of which were at the continuous power rating and the remaining 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at the overload rating. This test was performed by running the EDG's per the appre-l priate operating procedure which required hourly monitoring of the various components / aspects of the diesels performance. This monitoring included those items specified in item 2.
In summary, we have reviewed the cir:uit ry of our EDG's and have determined that no such cross connection exists.
In addition, a 24-hour operational test of the EDG's showed no conditions similar to the subject condition of this bulletin. Therefore, no corrective action is necessary or appropriate.
(> D /
Sincerely, 5
/s/ G. K. Hovey
//()
G. K. Hovey GKH:SDC: dad Director, TMI-2 cc:
J. T. Collins, B. J. Snyder 1
R0 0002o MI
TMI-2 BCC List Mr. E. L. Blake, Jr.
- Mr. Bill Lavallee Shaw, Pittman, Potts, & Trowbridge Nuclear Safety Analysis Center 1800 M Street, N.W.
P.O. Box 10412 Washington, D.C.
20036 Palo Alto, California 94303 Mr. A. S. Dam Dr. Steven Long, Director Burns and Roe, Inc.
Power Plant Siting Program 650 Winters Avenue Department of Natural Resources Parmus, New Jersey 07652 Tawes State Office, Building B-3 580 Taylor Avenue Mr. T. F. Hartley, Jr.
Annapolis, Maryland 21401 Marsh and McLennan, Inc.
1221 Avenue of the Americas Ms. Margaret Reilly New York, New York 10020 Chief Division of Reactor Review PA Department of Environmental Resources Mrs. Pat Higgins Fulton National Bank Building Edison Electric Institute Harrisburg, Pennsylvania 17120 1111 19th Street, N.W.
Washington, D.C.
20036 Mr. R. Sanacore Amecican Nuclear Insurers Mr. George Kulynych The Exchange - Suite 245 Babcock and Wilcox, Inc.
270 Farmington Avenue P.O. Box 1260 Farmington, Connecticut 06032 Lynchburg, Virginia 24505 c/o Document Manazetent 3 ranch G. K. Hovey, Trailer 105 Washington, D.C.
20355 P. R. Clark, CPUSC Parsippany R. Fenti, Trailer 22 - OA W. F. Schmauss, U-2 GRC Chm., Parsippany J. J. Barton, Trailer 102 A. S. Bell, TMI GORB Sec., Parsippany L. W. Harding, Trailer 68 M. A. Nelson, TMI-1 PORC Chm., Trailer 60 R. M. Klingaman, Me -Ed, Reading M. A. Shatto, U-1 PORC Sec., TMI-I N. Kazanas, Parsiopany, QA G. A. Kunder, U-2 PORC Chm., Trailer 104 J. F. Wilson, Trailer 14 D. C. Carl, U-2 PORC Sec., Trailer 104 J. G. Herbein, Trailer 118 B. A. Hockley, Discovery Room, Crawford Stat.
B. Ballard, Trailer 16 J. Theising, Becthel, Administration Bldg.
G. P. Miller, TMI-l R. L. Rider, Bechtel, Trailer 173 R. C. Arnold, Trailer 201 & Parsippany D. Smith, Production Supervision, Reading D. G. Mitchell, Trailer 68 P. 9. Walsh, GPU Parsippany S. D. Chaplin, Trailer 120 D. Buchan, Trailer 24 R. A. Knief, Trailer 118 B. D. Elam, Trailer 104 J. C. DeVine, Trailer 110 J. J. Chwastyk, TMI-2 Operations R. W. Heward, Parsippany G. J. Troffer, Trailer 198 W. N. Moreau, Trailer 109 G. Mencinsky, Parsippany J. T. Collins, NRC Trailer 1 J. Brasher, Trailer 180 E. G. Wallace, Parsippany Licensing File (6)
File: 02.0016.0001.0001.02
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