ML20071H726
| ML20071H726 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 02/17/1982 |
| 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 8203080510 | |
| Download: ML20071H726 (2) | |
Text
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U.S. Nuclear Regulatory Commission E
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Mr. James P. O'Reilly, Regional Administrator q
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Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - FILLET WELD MISSPECIFICATION -
NCR BLN BLP 8007 - SIXTH INTERIM REPORT The subject deficiency was initially reported to NRC-OIE Inspector R. W. Wright on November 7, 1980 in accordance with 10 CFR 50.55(e).
This was followed by our interim reports dated December 3, 1980 and January 19, April 9, July 6, and September 23, 1981. As discussed with R. V. Crlenjak by telephone on Fe.bruary 9,1982, our response was delayed.
Enclosed is our sixth interim report. We expect to submit our next report by June 23, 1982. This deficiency has also been reported for every TVA nuclear plant.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY i
N L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 8203080510 820217 PDR ADOCK 05000430 S
PDR gpMCMW e
An Equal Opportunity Employer h
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i ENCLOSURE i
BELLEFNITE NUCLEAR PLANT UNITS 1 AND 2 FILLET WELD MISSPECIFICATION NCR BLN BLP 8007 10 CFR 50.55(e)
SIXTH INTERIM REPORT Description of Deficiency In a number of Bellefonte Nuclear Plant systems, 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-maximum, 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. TVA's Singl'eton 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.
GeneraE donstruction Specification G-29C has been revised to clarify construction requirements for skewed T-joints.
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