ML20082R412
| ML20082R412 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/05/1983 |
| 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, NUDOCS 8312130160 | |
| Download: ML20082R412 (2) | |
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II M OEC I Pge6ege5,1983 U.S. Nuclear Regulatory Commission Region II Atta:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - ITT GRINNEL WELDED SUPPORTS -
.NCR BLN BLP 8002 - FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. W.
Wright on September 5,1980, in accordance with 10 CFR 50.55(e). This was followed by our interim reports dated October 3,1980, January 22, April 29, and October 21, 1981, March 26, July 12, and September 29, 1982 and March 11, 1983 Enclosed is our final report.
W^: 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.
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 Regulatory Commission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8312130160 831205
{DRADOCK 05000430 OFFICI AL COPV '
PDR g27 1I 1983-TVA 50m ANNIVERSARY An Equal Opportunity Employer
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 ITT GRINNELL WELDED SUPPORTS NCR BLN BLP 8002 10 CFR 50.55(e)
FINAL REPORT Description of Deficiency Detail sheets supplied by ITT Grinnell for assembly of pipe hangers and supports had discrepancies in weld designations. Certain supports with welds made on structural members that make angles less than 60 degrees and greater than 1?5 degrees were designated as fillet welds but should have been groove welds. On some groove welds which were specified, the parentheses around the dimension were omitted. This omission indicated depth or size of bevel when in fact ITT Grinnel meant effective throat.
- Both of the above weld joint designations conflict with applicable AWS symbols for welding (AWS A2.4-76) and do not provide sufficient information for fabr,1 cation and inspection.
Safety Implications Failure to use proper weld designations on design drawings has resulted in the fabrication of deficient pipe supports. Subsequent failure of these supports could result in failure of the associated safety-related piping thereby adversely affecting the safe operation of the plant.
-Corrective Action TVA requested a review of all support drawings for these weld deficiencies by ITTG in September 1980. From this review TVA determined that approximately 1,100 supports required corrective action. The revision of these 1,100 support drawings has been completed to indicate the proper AWS designation.
To prevent recurrence, ITTG engineering standard 16 revision E (weld design procedure for component supports) now reflects the use of AWS prequalified weld symbols. Process control documents have been prepared for all drawings revised under the scope of the NCR. The
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rework of these supports will be accomplished by construction packages in accordance with the newly established construction schedule. Unit 1 support rework will be completed by June 30, 1987. Unit 2 support rework will be completed by June 30, 1989.
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