ML19344A968

Addl Interim Deficiency Rept Re Current Status of Cut Reinforcing Bar Evaluation.Sargent & Lundy,Inc Analysis Indicates That Rebar Cuts Do Not Reduce Slab Capacity.Floor Load Design Rating Will Be Met.Final Rept Due by 801115

ML19344A968
Person / Time
Site:	Fermi
Issue date:	07/17/1980
From:	Fahrner W DETROIT EDISON CO.
To:
Shared Package
ML19344A964	List: ML19344A968
References
10CFR-050.55E, 10CFR-50.55E, EF2-49-020, NUDOCS 8008250241
Download: ML19344A968 (2)

Text

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July 17, 1980 l EF2-49,020 i

Mr. James C. Keppler 50-54I Regional Director Directorate of Regulatory Operations Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Subj ect: 10CFR50.55(e) Item on Cut Reinforcing Bar.

Dear Mr. Keppler:

The final report on the Cut Reinforcing Bar problem cannot be submit-ted to you by July 31, 1980, as scheduled. This additional interim .

report is to provide you with the current status of the evaulation of this problem.

The item was originally reported to Mr. F.J. Jablonski of NRC-Region III by Mssrs. R.W. Barr and W.M. Street of Detroit Edison, on December 27, 1979. At that time it had been determined that cut rebar may have resulted in a reduced floor load capacity in the Reactor Auxiliary Building at the Fermi 2 Site.

Detroit Edison Engineering determined that the scope of the affected area 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 or 150 PSF. The acceptability of the five (5) remaining slabs was l

indeterminate at that time.

Sargent and Lundy Engineering has completed an analysis of the five (5) most critical slabs utilizing detailed field as-built layout dia-

~ grams. Their evaluation indicates that rebar cuts have not signifi-I cantly reduced the capacity of the slabs. TheBased flooronload design this report, l

rating will be met and need not be reduced.

l Edison Engineering is now considering a reanalysis of the other seven l

(7) slabs to determine if derating the live load is necessary.

8008250 % g 41980 t -

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1 Mr. James C. Keppler July 17, 1980 EF2-49,020 Page Two A final report on this item should be submitted to you by November 15, 1980. If you have any queations concerning this matter, pleast con-gtactMr.H.A. Walker, Supervisor-ConstructionQualityAssurance.

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Sincerely.

fW W.J. Fahrner, Manager Enrico Fermi 2 WJF/ RAW /pn 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 ,

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