ML19331D968

Interim Deficiency Rept Re Agastat Relay Bases.Different Model Relay Mounting Base Has Been Ordered.Evaluation of GE Proposal to Modify Relay Bases Is Continuing.Final Rept Will Be Submitted by 801006

ML19331D968
Person / Time
Site:	Fermi
Issue date:	08/05/1980
From:	Fahrner W DETROIT EDISON CO.
To:
References
10CFR-050.55E, 10CFR-50.55E, EF2-49-821, NUDOCS 8009040455
Download: ML19331D968 (2)

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Detroit roco s, cone Awu. August 5, 1980 f[iyj$Qf""2 8 EF2-49,821 Mr. James C. Keppler Regional Director Directorate of Regulatory Operations

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

Subject:

10CFR50.55(e) Report on Agustat Relay Bases.

Dear Mr. Keppler The final report on the Agastat Relay Base problem, (reported per 50.55(e) requirements), cannot be submitted to you by August 6,1980, as scheduled.

This additional interim report is to provide you with the current status of the evaluation of this problem.

The problem was originally reported to Mr. Dick Knop by Mr. H.A. Walker in a telephone call November 9, 1979. It had been noted in performing checks on the Primary Containment Monitoring System that some ciredits through the Agastat relays were open when they should have been closed. Investigation revealed that pins in the relay mounting brackets connecting to the relays were loose and if a good align =ent of relay connector pins to mounting bracket terminal was not obtained, then the mounting bracket terminal was pushed away from the relay resulting in an open or intermittently open cir-cuit. At the time of the report, the problem had been noted only in the two panels of the Containment Monitoring System (panels Hil-P914 and Hil-P915). Subsequent investigation has revealed that this type relay base is also used in five additional panels which were supplied by General Elec-tric.

Detroit Edison has ordered a different model of relay mounting base for panels H11-P914 and H11-P915 which will replace all forty bases now in these panels. General Electric has submitted a proposal to modify the relay bases in the five G.E. supplied panels to eliminate the pin push out problem. Detroit Edison's evaluation of this proposal is continuing, and is expected to be completed in the near future.

A final report on this item is now scheduled to be submitted to you by October 6, 1980. If you have questions concerning this matter, please con-tact Mr. H.A. Walker of our Construction Qcality Assurance Organization.

Sincerely,

- laI'/

• W.J. Fahrner, Manager Enrico Fermi 2 N/{

WJF/ HAW /pn /g 6000040455

Mr. James C. Keppler August 5, 1980 Page Two EF2-49,821 cc: Mr. Victor Stello, Jr., Director Office of Inspection and Enforcement Division of Reactor Inspection Programs U.S. Nuclear Regulatory Commission Washington D.C. 20555 Mr. Bruce ,Little, Resident Inspector -l U.S. Nuclear Regulatory Commission Resident Inspectors Office 6450 North Dixie Highway ,

Newport, Michigan- 48166 I

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