ML20073J986
| ML20073J986 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 04/12/1983 |
| 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 8304190483 | |
| Download: ML20073J986 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY Ob
.C TIANOOGA. TENNESSEE 37401 M
4db bhestnut Street Tower II April 12, 1983 g g g A10 - l ?.
BLRD-50-438/83-03 BLRD-50-439/83-01 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator
-101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - UNQUALIFIED WELDING ON CABLE TRAY SUPPORTS - BLRD-50-438/83-03, BLRD-50-439/83 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on December 13, 1982 in accordance with 10 CFR 50.55(e) as NCR 2120. This was followed by our first interim report dated January 10, 1983 Enclosed is our final report. TVA does not now consider the subject nonconforming condition adverse to the safe operation of the plant. Therefore, we will amend our records to delete the subject noncon-formance as a 10 CFR 50.55(e) item.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Direstor (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commicsion
~
Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 l
Atlanta, Georgia 30339 MD bh o
PDR WfFf An Equat Opportunity Employer
A s
ENCLOSURE-BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 UNQUALIFIED WELDING ON CABLE TRAY SUPPORTS BLRD-50-438/83-03, BLRD-50-439/83-01 10 CFR 50.55(e)
NCR 2120 FINAL REPORT Description of Deficiency Three TVA welders working on safety-related cable trays made welds using -
weld processes they had not been qualified to perform. 'The welders had been qualified to perform short-circuit Gas Metal Arc Welding (GMAW) but the weld process used on the supports in question was the globular transfer l
process. The globular transfer process is also a GMAW technique but the amperage and voltage settings used are higher than those used with the short-circuit process. The same welders also used short-circuit GMAW welding for some welds beyond the limitations stated on the welding procedure.
Safety Implications This nonconformance was evaluated with respect to TVA's in-house requirements. It does not involve the governing code of this fabrication, American Welding Society (AWS) D1.1, under the provisions of which the welders and the welding procedure are qualified for the work performed. The in-house requirements are in consideration of the difference in operational characteristics of the.short circuiting and globular transfer variations of the GMAW welding process and the appropriateness of each for certain welding applications. They provide extra assurance for welder skill with the process variation to be used and limit application of the short circuiting variation to relatively thin materials for which TVA considers the process most suited.. o : aaVu.1;.pLusn+%d%aJdhyk%uiuu.4LiAn%si;.g.W,ind44kCs.:A:.a; i
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For the fabrication involved in this nonconformance (groove and fillet welds in material 3/8 inch =. thick and. less);,the_nonconformance;is;not &% ' + r-g
, 12 consideredlto compromise' the. usability or' structural ~ integrity of,the; '
1
' affected cable tray supports. ' Consequently, the subject welds ~ may be used'"as-is."
Therefore, there are no safety implications to Bellefonte, and TVA no longer considers this item to be reportable under 10 CFR 50.55(e).
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