ML20083J853

Interim Deficiency Rept,Item 87,re Possible Ite Circuit Breaker Failures.Initially Reported on 830304.Replacement Solid State Trip Devices Received.Mod Request Issued to Allow Work on Replacements.Work Will Be Completed June 1984

ML20083J853
Person / Time
Site:	Fermi
Issue date:	12/16/1983
From:	Wells D DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, 87, EF2-66484, NUDOCS 8401050450
Download: ML20083J853 (3)

Text

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A/h8 Donald A. WeHs Manager-Oval.tv Assurance 1 (313) 237 % 57 I n'!Eo$.*No^aTle*22s

<313) 237-8 December 16, 1983 EF2-66484 Mr. James G. Keppler, Regional Administrator Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

Interim Report of 10CFR50.55(e) Item on Possible ITE Circuit Breaker Failures (#87)

Dear Mr. Keppler:

s This interim report involving ITE circuit breaker failures has been prepared to provide the current status of this problem.

This item was originally reported to Mr. P. Pelke of NRC Region III by Detroit Edison's Mr. D. Ferencz, Acting Supervisor - Construction Quality Assurance on March 4, 1983.

A memorandum received from the NRC, concerning Brown Boveri Electric, Inc. (formerly ITE) low voltage circuit breakers, described a problem involving a defective capacitator in the trip circuit which, upon failure, prevents the breaker from opening during an overcurrent con-dition. The failure of this capacitator and .the trip device can result in failure to interrupt a fault.

Detroit Edison has received the replacement solid state trip devices from Brown Boveri Electric, Inc. A Field Modification Request has been issued to enable field personnel to work on these replacements.

Of the one hundred thirty (130) devices equipped with a type 40D capacitator, it has been determined by Electrical Engineering that seventy-three (73) devices in QA Level I switchgear and fif ty-seven (57) in QA Level II ~ gear must be modified to remove the defective capacitator. . It is anticipated that the work on QA Level I will be completed by December _ 31, 1983. The fifty-seven (57) QA Level II capacitators will then be replaced when the switchgear is shut dowf for maintenance checks. It is expected that all of this work wil be completed by June, 1984.

9-3N 8401050450 831216 PDR ADOCK 05000341 S PDR DEC 2 3 W ZE=97 I O g

Mr. James G. Keppler, Regional Administrator December 16, 1983 EF2-66484 Page:2 Another report on this item either interim or final, will be sent when further information is available. If you have questions concerning this matter, please -contact Mr. G. M. Trahey, Assistant Director -

Project Quality Assurance.

Very truly yours, a vu OR>

cc: Mr. Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Mr. Paul Byron,- Senior Resident Inspector U. S. Nuclear Regulatory Commission 6450 North Dixie Highway Newport, Michigan 48166 e-i e

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Mr. James G. Keppler, Regional. Administrator .

' December 9,1983 EF2-66484 Page 3

~bec: F. E. Agosti

'T. A. Alessi A. Alexiou C. R. Bacon

.L. P. Bregni

.J. A. Cartmill W. F. Colbert O. K. Earle W. J. Fahrner D. Ferencz E. P. Griffing C.-M. Heidel W. R. Holland Institute of Nuclear Power Operations (INPO)

W. H. Jens R. S. Lenart

~E. Lusis P. A. Marquardt/ Docket File (2)

W. E. Miller, Jr.

E. H. Newton S. H. Noetzel J. W.'Nunley E. M. Page R. G. Rateick W. L. Reid.

J. D. Ryan L. E. Schuerman D. Spiers G. M. Trahey-R. A. Vance/L; E. Eix A. E. Wegele Site Document Control i NRC Follow-Up Book /NRC File Chron File l

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