ML20112D132
| ML20112D132 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/20/1984 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-3180, NUDOCS 8501140094 | |
| Download: ML20112D132 (2) | |
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TENNESSEE TALLEY AUTHORITY 3
CHATTANOOdA.' TENNESSEE 37401 1630 Chestnut Stree To II
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December 20, 1984 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 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E.
Fredricl: son on June 11, 1984 in accordance with 10 CFR 50.55(e) as NCR 3180. This was followed by our interim report dated July 10, 1984.
Enclosed is our final report. A several week delay of this submittal was discussed with Inspector P. E. Fredrickson on September 26, 1984.
1 TVA does not inw consider the subject ronconforming condition adverse to the safe operation of the plant. Therefore, we will amend our. records to i
delete the subject nonconformance 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 i
W. H am nager 16 3ensingi
\\ Regulations
. Enclosure l
l cc:
Mr. Richard C. DeYoung, Director (ErW1osure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Records Center - (Enclosure)
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Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite.1500 Atlanta, GeorSia 30339 8501140094 841220 DFFlOAL COPY PDR ADOCK 05000438
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An Equal Opportunity Employer :
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 DISCONTINUITIES ON SHEAR LUG TO PIPING WELLS BLRD-50-43 8/84-40 NCR 3180 10 CFR 50.55(e)
FINAL REPORT l
Description of Deficiency The only full-penetration lug welds at Bellefonte Nuclear Plant (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 ultrasonically n
examined and 8 exhibited discontinuities along the longitudinal axis of the lug where the lug intersects the surface of the pipe.
All of the 44 installed lugs are on the makeup and purification system.
This condition was previously idettified at TVA's Watts Bar Nuclear Plant (WBN) for ASME classes 2 and 3 full-penetration lug welds as nonconformance L
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 7.
condition. As a result of an investigation into this item at BLN, the condition has been identified as applying to ASME class 1 lug welds at BLN.
l 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:1ug attachment welds be back ground or gouged before welding the second side.
Safety Implications TVA has completed a review of the class 1 piping analysis of the affected i
weld locations. The results of that myiew have been compared to
. applicable ASME Code requirements and indicate that the actual stresses
~ imposed on the affected lugs meet the requirements of the 1980 ASME' Code, paragraph NB3123.2. Thus, the configuration of the existing welds is considered adequate to meet the original design, and the NCR has been dispositioned to. "use as is." Theretcre, TVA no longer considers 10 CFR 50.55(e) applicable to this item.
1 To prevent mourrence of this deficiency, TVA has added an additional. hold point on the automated process control (APC) weld operation diecklist card for all ASME Code Section III, Class 1, full-penetration lug welds. This additional hold point will ensure that the backgrinding/ gouging operation.
is verified - and documented.
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