ML20070J104

Interim Deficiency Rept Re Frozen Reactor Mode Switch 73 & Failure of Contacts to Maintain Position During Operation. Initially Reported on 820701.Switch Modified.Qualification Work for Switch Handle in Progress.Next Rept Due by 830324

ML20070J104
Person / Time
Site:	Fermi
Issue date:	11/24/1982
From:	Wells D DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, EF2-61202, NUDOCS 8212270359
Download: ML20070J104 (2)

Text

s Donald A. Wells Manaw-Qaa5N Assuce

<3'3; 237-9c57 2000 Second Avenue lM f3%fh7Mw4a22s Noverter 24, 1982 EF2-61202 Mr. James G. Keppler, Regional .Mninistrator 5P3 Region III U.S. Nuclear Regulatory Ccmnission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

interim Report of 10CFR50.55(e) Item on Reactor Mode Switch Failures (#73)

Dear Mr. Keppler:

This interim report on reactor mode switch failures has been prepared to provide the current status of this problem.

This item was originally reported to Mr. H. Wescott of NRC Region III by f Detroit Ediscn's Mr. H.A. Walker, Supervisor-Construction Quality Assurance, on July 1, 1982.

The switch was frozen in one position, and could not be placed in other rode selections. In addition, scrne of the contacts would not traintain their position during operation. For exa:q)1e, a "normally open" contact for the mode selection would incorrectly remain closed when the switch was I:cved from one position to another position. The switch has been modified, under the direction of General Electric, and found acceptable. Additionally, qualification work is required for the switch handle. This work is presently ,

in progress.

Another report on this item, either interim or final, is scheduled to be sent on or before March 24, 1983. If you have questions concerning this Inatter, please contact Mr. G.M. Trahey, Assistant Director - Project Quality Assurance.

Very truly ywrs, DAW /DF/cp i

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s Mr. James G. Keppler, Regional Administrator November 24, 1982 Page % o - EF2--61202 cc: Mr. Richard DeYoung, Director '*

Office of Inspection and Enforcement U.S. Nuclear Regulatory Ccanission Washington, D.C. 20555 Mr. Bruce Little, Senior Resident Inspector U.S. Nuclear Regulatory Ccunission 6450 North Dixie Highway Newport,flichigan 48166 t

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