ML20072N033
| ML20072N033 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 03/23/1983 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-83 10CFR-050.55E, 10CFR-50.55E, NCR-1853, NUDOCS 8304010433 | |
| Download: ML20072N033 (2) | |
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x-TENNESSEE VALLEY AUTHORITY 3dd Ch"est$dit3Eee*t Iower II iA
,3 March 23, 1983 5 d.f BLRD-50-438/82-46 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:
1 BELLEFONTE NUCLEAR PLANT UNIT 1 - WELD DEFECTS ON REACTOR BUILDING COOLER SUPPORTS - BLRD-50-438/82-46
-REVISED FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. V. Crlenjak on June 21, 1982 in accordance with 10 CFR 50.55(e) as NCR 1853 This was followed by our interim reports dated July 20, and October 27, 1982 and our final report dated February 3, 1983 As discussed with Inspector P. E. Fredrickson on March 16, 1983, enclosed is our revised final report. We consider 10 CFR Part 21 applicable to this deficiency.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
4 4
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, nager Nuclear Licensing i
Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure) i Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission l
Washington, D.C.
20555 l
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Mr. James McFarland (Enclosure)
Senior Project Manager Babcock & Wilcox Company P.O. Box 1260 l
Lynchburg, Virginia 24505 l
8304010433 830323 PDR ADOCK 05000438
- OFFICIAL CUPy S
PDR ffj An Equal Opportunity Employer
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 WELD DEFECTS ON REACTOR BUILDING COOLER SUPPORTS NCR 1853 BLRD-50-438/82-46 10 CPR 50.55(e)
REVISED FINAL REPORT Description of Deficiency Twenty-four mitered joints on 12 header supports which are used on the Reactor Building (RB) cooler coils exhibit either or both lack of fusion and undercut (greater than 1/32 inch and less than 1/8 inch).
The welds were fabricated by the manufacturer, American Air Filter (AAF)
Company, Incorporated, Louisville, Kentucky, and the units were supplied to TVA under the NSSS contract awarded to Babcock & Wilcox (B&W) of Lynchburg, Virginia. The AAF drawings specify that welding shall conform to the AWS Code D1.1, Revision 2, dated 1974.
Safety Implications Should the subject welds fail, the RB coolers could experience a loss-of-function failure. The RB coolers are used during both normal operations and-accident conditions as a primary safety-related component to prevent containment overpressurization and/or overheating of the RB atmosphere..
Consequently, the cited deficient welds could contribute to a condition adverse to the safety of operations of the plant.
Corrective Action The subject supports were returned to AAF. A joint inspection of the supports was performed there by representatives from TVA Construction, TVA Engineering Design (EN DES), and AAF and all parties have agreed upon the specific weld defects to be repaired. After the weld repairs have been completed, an inspector -from EN DES's Quality Engineering Branch (QEB) will reinspect all the repaired areas at AAF's shop to verify that the welds now-conform to the requirements of AWS Code D1.1, revision 2, dated 1974, as specified on the AAF drawings. AAF will prepare a weld map to document the
- repairs made for each support. A copy of the weld map will be included when the supports are returned to the Bellefonte site. Final acceptance of the reworked supports will be documented upon source in' pection and s
acceptance.
To prevent recurrence, QEB has informed the responsible TVA regional quality control office of this nonconforming condition and requested that they increase their source surveillance on all future shipments from any of AAF's manufacturing facilities.
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