ML20010J276

Fifth Interim Deficiency Rept Re Fillet Weld Misspec, Initially Reported on 801107.Util Has Fabricated Mockups of Deficient Welds.Review of Destructive Tests Performed on Mockups in Progress.Next Rept Will Be Provided by 820209

ML20010J276
Person / Time
Site:	Bellefonte
Issue date:	09/23/1981
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8109300216
Download: ML20010J276 (2)

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ta p TENNESSEE VALLEY AUTHORITY ,

W ATTANCCGA. TENNESSEE 37401 400 Chestnut Street Tower II

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1 September 23, 1981 gbN ' 4 Mr. James P. O'Reilly, Director '

Office ef Inspection and Enforcement -

g U.S. Nuclear Regulatory Commission gPgg ' g  !

Region II - Suite 3100

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101 Marietta Street Q k %:no niscu g, Atlanta, Georgia 30303 V4

Dear Mr. O'Reilly:

un BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - FILLET WELD MISSPECIFICAT10M - NCR BLN BLP 8007 - FIFTH INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. W. Wright on November 7, 1980, in accordance with 10 CFR 50.55(e).

3 This was followed by our interim reports dated December 3, 1980, January 19, April 9, and July 6, 1981. Enclosed is our fifth interim

report.- This deficiency has also been reported for every TVA nuclear plant. We expect to submit our next report by February 9, 1982. If you have any questions, please call Dave Lambert at FTS 857-2581.

t Vety truly yours, TENNESSEE VALLEY AUTHORITY ll }f) QI Y. M. Mills, Ms.nader Nuclear Regulation and Safety i Enclosure oc: Mr. Victof Stello, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission

, Washington, DC 20555 1

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0109300216 8104k3 PDR ADOCK 05000438.

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.p ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 FILLET WELD MISSPECIFICATION NCR BLN BLP 8007 10 CFR 50.55(e)

- FIFTH INTERIM REPORT Description of Deficiency -

In c. number of Bellefonte Nuclear Plant system, fillet welds were specified, in lieu of beveled groove welds, to connect members whose angle of intersection is outside the limits for fillet weld application as stipulated in the American Institute of Steel Construction (AISC) Standards. The AISC Standard statgs that the welds which are made joining members at an angle of 60 or less are to be defined as acute angle welds. Acute angle welds should be '

.specified as beveled groove welds according to AISC.

Our investigation has identified violations of the 135-degree-eaximum, 60-degree-minimum angle permitted for intersecting members of prequalified fillet-welded skewed tee joints. This. requirement;,is imposed by the American Institute of Steel Construction (AISC) Specification for the Design, Fabrication, and Erection of Structural Steel for Buildings and the American Welding Society (AWS) D1.1 Structural Welding Code.

Interim Progress __  ;

TVA has fabricated representative mockups of the subject deficient welds. The Singleton Laboratory has been authorized to perform destructive tests on these mockups and has provided TVA with the results of these tests. Review of the test results is continuing.

Engineers and designers have been alerted to the AISC/AWS requirements for limiting angles for skewed tee joints.

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