ML20090G955
| ML20090G955 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 07/10/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-3180, NUDOCS 8407260018 | |
| Download: ML20090G955 (2) | |
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-TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNFSSEE s74ot 400 Chestnut Street Tower II
- 2 JuTy
- 1@,81984 BLRD-50-438/84-40
.U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNIT 1 - DISCONTINUITIES ON SHEAR LUG TO PIPING WELDS - BLRD-50-438/84 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on June 11, 1984 in accordance with 10 CFR 50.55(e) as NCR 3180. Enclosed is our first interim report. We expect to submit our next report on or about October 30, 1984.
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 oc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Pogulatory Commission Washington, D.C.
20555~
Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Geot gia 30339 O k ohofQO P$k OFFICtAL SOM, 1983-TVA 50TH ANNIVERSARY
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An Equal Opportunity Employer
ENCLOSURE
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BELLEFONTE NUCLEAR PLANT UNIT 1 DISCONTINUITIES ON SHEAR LUG TO PIPING WELDS BLRD-50-438/84-40 NCR 3180 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency This condition was previously identified at TVA's W' tts Bar Nuclear Plant a
(WBN) for ASME classes 2 and 3 full-penetration lug welds as nonconformance report (NCR) 5559 (WBRD-50-390/84-17, WBRD-50-391/84-17). TVA subsequently issued Quality Bulletin 84-10 to notify other TVA nuclear plants of the condition. As a result of an investigation into this item at Bellefonte Nuclear Plant (BLN), the condition has been identified as applying to ASME class 1 lug welds at BLN.
The condition is one in which full-penetration welds attaching shear lugs to piping have discontinuities along the longitudinal axis of the lug where the lug intersects the surface of the pipe. The only full-penetration lug welds at BLN are on ASME class 1 piping. A total of 44 ASME class 1 lugs have been installed at BLN. A sample of 12 of these 44 lugs was ultra-sonically examined and 8 exhibited the subject discontinuities. All of the 44 installed lugs are on the makeup and purification system.
The cause of this deficiency has been determined to be a failure by craft personnel to consistently follow the requirements of TVA General Construction Specification G-29M.
G-29M drawing 1.M.1.2-12 requires that the lug attachment welds be back ground or gouged before welding the second side.
Interim Progress TVA is investigating the consequences of using the welds "as '4" and will disposition this item accordingly.
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