ML19350A526

Interim Deficiency Rept Re Type Cmc micro-switches in Control Room,Initially Reported on 801203.Testing of Switches Is Continuing.Six Defective Switches Have Been Replaced.Final Rept Will Be Forwarded by 810707

ML19350A526
Person / Time
Site:	Fermi
Issue date:	03/06/1981
From:	Hines E DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, EF2-49-943, NUDOCS 8103160422
Download: ML19350A526 (1)

Text

Edward Hines -

A n *Ja*' . -- ~., q af t a ,2s u ae:e Detroit March 6,

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, , a n. m. , .2 3 EF2-49 N S 6 Mr. James G. Keppler, Director Region III

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U.S. Nuclear Regulatory Commission y 8,s, .

799 Roosevelt Road aprog////7 I'l Glen Ellyn, Illinois 60137

Subject:

Interim Report of 10CFRSO.55(e) Item on Micro-Swit Switches. (#34)

Dear Mr. Keppler:

The final report on the Micro-Switch CMC Type Switches problem cannot be submitted to you by March 10, 1981, as scheduled. This additional interim report is to provide you with the current status of the evaluation of this problem.

The item was originally reported to Mr. R. Knop of the NRC - Region III by Detroit Edison's Mr. H.A. Walker, Supervisor - Construction Quality Assu-rance, on December 3, 1980. At that time, a number of defective Micro-Switches, CMC Type, were noted on GE supplied panels in the Fermi 2 control room. Approximately two to three hundred 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. De fec tive switches have been replaced and te, sting will continue.

A final report on this item should be submitted to you by July 7,1981. If you have any questions concerning this matter, please contact Mr. H.A. Walker, Supervisor - Construction Quality Assurance.

Very truly yours, l

EH/ HAW /pn ec: Mir. Victor Stello, Jr. , Directcr Of fice of Inspection and Enforcement Division of Reactor Inspection Programs U.S. Nuclear Regulatory Commission Washington, DC 20555 Mr. Bruce Little, Resident Inspector U.S. Nuclear Regulatory Commission Resident Inspectors Office 6450 North Dixie Highway Newpor.' Michigan 48166 s {0 i E108160 %