ML20101M952

Final Deficiency Rept,Item 139 Re Deficient Shop Weld in Fluid Head Structure.Initially Reported on 841015.Review of Stress Calculations Revealed Max Stress on Welds Does Not Exceed Allowable.Item Not Reportable Per 10CFR50.55(e)

ML20101M952
Person / Time
Site:	Fermi
Issue date:	12/12/1984
From:	Jens W DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
139, EF2-70224, NUDOCS 8501030302
Download: ML20101M952 (2)

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, Wayne H. Jens L/ _

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Va P edet- f NuckNlt Operatens f'.e , Fermi-2 6400 North Cknie Highway

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. Mr. James G. Keppler

j. ~ Regional Administrator Region III

U..S. Nuclear Regulatory Commission 799 Roosevelt' Road i Glen Ellyn, Illinois 60137 i

Dear Mr. Keppler:

References (1) Fermi 2 f, . NRC Docket No. 50-341 (2) Letter, W. H. Jens to J. G. Keppler, i- October 15, 1984, EF2-70031 f

Subject:

Final Evaluation of 10CFR50.55(e) Item 139  ;

" Deficient Shop Weld in a Flued Head Structure" This is Detroit Edison's final report of 10CFR50.55(e) Item 139, " Deficient Shop Weld in a Flued Head Structure." ,

! . Detroit Edison has completed its investigation of this item

! and has concluded it is not reportable under the require-

ments of-- 10CFR50.55(e) .

As reported in reference 2, a shop weld was inadvertently-tested 1during ultrasonic testing of field welds'on the flued .

head structures in the steam tunnel. This test indicated that the weld-was unacceptable although the weld had been.

i 4

. tested and accepted by the manufacturer,-Schreiber Steel, prior to delivery to Fermi 2. This deficiency was docu-mented in a Deviation Disposition' Request DDR (W)12290. The 1

4 weld was repaired and ratested=successfully. The DDR used to document this deficiency _didinot address whether other

. welds from this manufacturer should be evaluated for similar deficiencies.

Flued head structures are steel frames composed of built up-box members and were designed and fabricated to American

-Institute for Steel Construction-(AISC) requirements.

Welding was performed in accordance with'American Welding i Society 1(AWS) Dl.1' code. However,' nondestructive'examina-tion wasIspecified by Detroit Edison to the more stringent requirements of ASME Section'III Article NB-5000. i hDR 0 1

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Mr. James G. Keppler December 12,1984 EF2-70224

'Page 2-This'section of the ASME code applies to pressure vessels and piping, not structural frames such as the flued head

-structure where AWS Dl.1 is more applicable. Therefore, the applicable design documents are being revised to specify ~

that the structure meet the more applicable AWS Dl.1 requirements.

A review of the stress calculations for the as-built con-figurations of the flued head structures revealed that the

-maximum stress on any of the. welds does not exceed 334 of

.the allowable. Based on reinspections and the low loads on the welds, the flued head structures did not require modifi-cation or repair to meet their intended safety function.

Therefore,.this deficiency would not have affected the safety of the plant.

This is Detroit Edison's final report on this item. If you have-questions concerning this matter, please contact Mr. Lewis'Bregni, (313) 586-5083.

Sincerely, cc 'P. M. Byron, R. C. DeYoung ,

R. C. Knop-USNRC Document Control Desk Washington, D.C. 20555

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