ML19318C961

Interim Deficiency Rept Re Agastat Relay Base Problem. Subsequent Investigation Revealed That Relay Base Is Also Used in Five Addl GE Panels.Final Rept Will Be Forwarded by 800806

ML19318C961
Person / Time
Site:	Fermi
Issue date:	06/05/1980
From:	Fahrner W DETROIT EDISON CO.
To:
Shared Package
ML19318C960	List: ML19318C961
References
EF2-49-012, EF2-49-12, NUDOCS 8007070098
Download: ML19318C961 (1)

Text

7, Deholt 2000 Second Avenue June 5, 1980 U$ $$ Man 4822s EF2-49,012 Mr. James C. Keppler Regional Director Directorate of Regulatory Operations Region III U.S. Nuclear Regulatory Commission g,pl 799 Roosevelt Road Glen Ellyn, Illinois 60137 Subj ect: 30CFR50.55(e) Report on Agastat 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 June 7, 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 circuits through the Agaetat 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 alignment 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 intermittantly open circuit. At the time of the report the problem had been noted only in the two panels of the Containment Monitorning System (panels Hll-P914 and Hil-P915). Subsequent investigation has revealed that this type relay base is also used in five additional panels which were sup-plies by General Electric.

Detroit Edison has ordered a different model of relay mounting base for panels Hll-P914 and-Ull-P915 which will replace all forty bases now in these panels.

Genera ~1 Electric has submitted a proposal to modify the relay bases in the five G.E. supplied panels to eliminate the pin push out problem. This proposal is currently being evaluated by Detroit Edison Engineering.

A final report on this item should be submitted to you by August 6, 1980. If you have questions concerning this matter, please contact Mr. H.A. Walker of our Construction Quality Assurance Organization.

Sincerely,

-] ,

W.J. Fahrner, Manager Enrico Fermi 2 WJF/ HAW /pn ec: Mr. Victor Stello, Jr., Director Office of Inspection and Enforcement Division of Reactor Inspection Programs U.S. Nuclear Regulatory Commission Washington D.C. 20555 JuN 121980 8007070MP. .