ML20058J075

Interim Deficiency Rept Re Reactor Mode Switch Failure. Initially Reported on 820701.Switch Repaired by Ge. Investigation of Switch Design Continuing.Next Rept Expected by 821124

ML20058J075
Person / Time
Site:	Fermi
Issue date:	07/30/1982
From:	Wells D DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, EF2-59382, NUDOCS 8208090154
Download: ML20058J075 (1)

Text

i Donald A. Wells

~

f i $$$1Y 2000 Second Avenue 31 3-July 30,1982 EF2-59382 Mr. James G. Keppler, Regional Administrator Region III U.S. Nuclear Regulatory Ccmnission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

Interim Report of 10CFR50.55(e) on Reactor Mode Switch Failure (#73)

Dear Mr. Keppler:

On July 1,1982, Detroit Edison's Mr. H.A. Walker, Supervisor-Construction Quality Assurance, telephoned Mr. H. Wescott of NRC Region III- to report on a problem with reactor mode switch failure at the Fermi 2 site.

The switch is frozen in one position, and cannot be placed in other modo selections. In addition, scme of the contacts would not maintain their position during operation. For example, a contact "normally open" for a made selection would be open, and when the switch was moved to another pusition and returned the contacts would remain closed. The switch had failed on a previous occasion and had been repaired by General Electric.

This could be a problem with~the design of the switch. _An investigation of the problem'is continuing.

. Another report on this item, either interim or final, is schc<luled to be

[ sent to you on or before November 24, 1982. If you have questions concerning this Iratter, please contact Mr. CtM. Trahey, Assistant Director-Project Quality Assurance.

I t

Very truly yours, 's

/ l

)

DAW /DEP/cp cc: Mr. Richard DeYoung, Director i Office of Inspection and Enforcement ^

l Division of Reactor Inspection Programs

.Washington, D.C. 20555 Mr. Bruce Little, Resident Inspector U.S. Nuclear Regulatory Ccumission I- 6450 North Dixie Highway l Newport, Michigan 48166 8208090154 820730 S N'g

PDR ADOCK 05000341 AUG

-S PDR Q Q7