ML19254F336

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Responds to IE Bulletin 79-23 Re Potential Failure of Emergency Diesel Generator Field Exciter transformer.Wye-Wye Type Transformer Not Susceptible to Third Harmonic Inducted Circulating Currents.Reg Guide 1.108 Used as Guideline
ML19254F336
Person / Time
Site: Fermi DTE Energy icon.png
Issue date: 10/23/1979
From: Hines E
DETROIT EDISON CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
IEB-79-23, NUDOCS 7911090074
Download: ML19254F336 (1)


Text

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Edward Hines s -r._ -

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Edison

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October 23, 1979 EF2-50,629 s

Mr. James G. Keppler Regional Director Directorate of Regulatory Operations Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

Detroit Edison Response to IE Bulletin 79-23 This is in response to your letter on cket 50-341, dated September 12, 1979, together with IE Bulletin 79 ^3. This IE Bulletin describes potential failure of emergency diesel p ,erator (EDG) field exciter transformer.

The Enrico Fermi Unit 2 EDG's have Wye-Wye connected exciter power supply transformers and are not susceptible to third harmonic inducted circulating currents from the generator. Also, Fermi 2 has committed in the EF2 FSAR, Appendix A, to follow USNRC Regulatory Guide 1.108, Revision 1, for the EDG preoperational and surveillance test program.

If you require any additional action by us on this matter, please advise us.

Very truly yours, h2 W. ~ h -% - t ,

cc: Office of Inspection and Enforcement Division of Reactor Operations Inspection U.S. Nuclear Regulatory Commission Washington D.C. 20555 1301 234 OCT 261979 7911090 0 7 I