ML19337A482
| ML19337A482 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 09/10/1980 |
| From: | Fiorelli G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Hines E DETROIT EDISON CO. |
| References | |
| NUDOCS 8009290065 | |
| Download: ML19337A482 (1) | |
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Docket No. 50-341 The Detroit Edison Company ATTN:
Mr. Edward Hines, Assistant Vice President and Manager Quality Assurance 2000 Second Avenue Detroit, MI 48226 Gentlemen:
Thank you for your interim report dated August 5, 1980, pursuant to 10 CFR 50.55(e) regarding Agastat Relay Base problem. We will review your final report on this matter upon receipt.
Your cooperation with us is appreciated.
Sincerely, hs
- '*'S G. Fiorelli, Chief Reactor Construction and Engineering Support Branch cc: Director, RCI/IE Director, AEOD Chief, OEB/MPA IE Files cc w/ltr dtd 8/5/80:
Central Files PDR Local PDR NSIC TIC Ronald Callen, Michigan Public Service Commission Eugene B. Thomas, Jr.,
Attorney 8009290065 S
g Detroit August 5, 1980 rr sm Edsonm w,wa 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 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 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 circuits 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 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 intermitte.,tly 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 Hll-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 Hil-P914 end Hll-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 Quality Assurance Organization.
Sincerely,
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-l W.J. Fahrner, Manager Enrico Fermi 2 WJF/ HAW /pn j
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Dd August 5, 1980 Mr. James C. Keppler EF2-49,821 age Tw 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 U.S. Nuclear Regulatory Commission Resident Inspectors Office 6450 North Dixie Highway Newport, Michigan 48166 1
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