ML19339C552
| ML19339C552 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 11/04/1980 |
| From: | Hines E DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 830, EF2-49, NUDOCS 8011180591 | |
| Download: ML19339C552 (2) | |
Text
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Detroit Edison G!?Ss*
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u November 4,1980 EF2-49,830 4
ffr. James G. Keppler, Director
. Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Subject:
10CFR50.55(e) Item On Cut Reinforcing Bar
Dear Mr. Keepler:
The final report on the Cut Reinforcing Bar problem cannot be submitted to you by November 15, 1980, as scheduled. This additional interim report is to provide you with the current status of the evaluation of this problen.
The item was originally reocrted to Mr. F.J. Jablonski of NRC-Region III by Mssrs. R.H. Barr and W.M. Street of Detroit Edison, on December 27, 1979.
At that time it had been detemined that cut rebar may have resulted in a reduced floor load capacity in the Reactor Auxiliary Building at the Femi II site.
Detroit Edison Engineering detemined that the scope of the affected a.ea for impinging on the structural integrity was twelve (12) slabs. Their study also indicated that seven of the twelve slabs could be acceptable by derating the original design live load of 400 PSF to 100 to 150 PSF.
The acceptability of the five (5) remaining slabs was indeteminate at that time.
Sargent and Lundy Engineering-has completed an analysis of the five (5) most critical slabs utilizing detailed field as-built layout diagrams.
Their evaluation indicates that rebar cuts have not significantly reduced the capacity of the slabs. The floor load design rating will be met and need not be reduced. Based on this report, Edison Engineering is now re-analysing the other seven (7) slabs to detemine if derating the live load is necessary. This has not been completed to date.
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Mr. James G. Keppler November 4, 1980 Page Two EF2-49,830 A final report on this item should be subaiitted to you by March 13, 1981.
If you have any questions concerning this matter, please contact Mr. H.A.
Walk, Supervisor - Construction Quality Assurance.
Very truly yours, EH/ HAW /cp-cc: Mr. Victor Stello, Jr., Director w' Office of Inspection and Enforcement Division of Reactor Inspection Pro 9.'ams 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
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