ML20002E532

Interim Deficiency Rept Re Defective Micro Switches Initially Reported 801203.Six Switch Failures Found Out of 130 Switches Tested.Caused by Crushed Internal Parts.Final Rept Will Follow by 810310

ML20002E532
Person / Time
Site:	Fermi
Issue date:	12/23/1980
From:	Hines E DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, EF2-49-874, NUDOCS 8101290006
Download: ML20002E532 (1)

Text

Edward Hines x Q 7Tc

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De!,roi! # (d6[.A O,w,Y, dison . t," wam i:

e,s eg2,7li"# December 23, 1980 sx , ~EF2-49,874

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Mr. James G. Keppler, Director A 71, O~

Region III M U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

Interim Report of 10CFR50.55(e) Item on Micro-Switch CMC Type Switches. (#34)

Dear Mr. Keppler:

On December 3,1980, Detroit Edison's Mr. II.A. Walker, Supervisor -

Construction Quality Assurance, telephoned Mr. R. Knop o f the NRC -

Region III to report on a problem with defective Micro-Switches at the Fermi 2 Site.

A number of defective Micro-Switches, CMC type, were noted on GE supplied panels in the Fermi 2 control room. Approximately two to three ht.ndred of these switches are used in the GE supplied control room equipment.

Start-Up has tested a hundred and thirty of these switches and noted six failures. The reason for the failures were crushed internal parts in the switches, improperly assembled switches and other damaged parts. It was apparent that these switches were installed in this condition. Defective switches have been replaced and testing of these switches will continue.

A final report is scheduled to be submitted to you by March 10, 1981.

If you have questions concerning this matter, please contact Mr. H. A.

Walker, Supervisor - Construction Quality Assurance.

Very truly yours,

- /

Ell /IIAW/cp .h L"'W /

cc: Mr. Victor Stello, Jr., Director Office'of Inspection and Enforcement Division of Reactor Inspection Programs

.U.S. Nuclear Regulatory Commission i

Washington, D.C. 20555 Mr. Bruce Little, Resident Inspector U.S. Nuclear Regulatory Commission Resident Inspectors Office 6450 North Dixie flighway Newport, Michigan 48166 g 81012qoOCG Ta'1 2 Os1