ML20205M025

Final Deficiency Rept Ncr 4490 Re Piping Component Support Welds Not Meeting Insp Criteria.Initially Reported on 850927.Visual QA Certification of Inspectors Implemented. Item Not Reportable Per 10CFR50.55(e)

ML20205M025
Person / Time
Site:	Bellefonte
Issue date:	03/31/1986
From:	Gridley R TENNESSEE VALLEY AUTHORITY
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NCR-4490, NUDOCS 8604140470
Download: ML20205M025 (2)

Text

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D TENNESSEE VALLEY AUTHORITY

, D O SN 157B Lookout Place

] [Sb March 31, 1986 BLRD-50-438/85-28 BLRD-50-439/85-26 U.S. Nuclear Regulatory Commission Region II Attn: Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, NW, Suite 2900 3 Atlanta, Georgia 30323 l

Dear Dr. Grace:

BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - PIPING COMPONENT SUPPORT WELDS DO NOT MEET INSPECTION CRITERIA - BLRD-50-438/85-28, BLRD-50-439/85 FINAL _ REPORT The subject defielency was initially reported to NRC-OIE Inspector Al Ignatonis on September 27, 1985 in accordance with 10 CFR 50.55(e) as NCR 4490. This was followed by our first interim report dated October 29, 1985. '

Enclosed is our final report. We no longer consider this deficiency to be reportable under the provisions of 10 CFR 50.55(e).

If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.

Very truly yours, TENNESSEE VALLEY AUTHORITY R. . ridley Manager of L censing Enclosure cc: Mr. James Taylor, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Conunission Washington, D.C. 20555 Records Center (Enclosure)

Institute of Nuclear Power Operations 1100 circle 75 Parkway, suite 1500 Atlanta, Georgia 30339 i

P B

l An Equal Opportun6ty Employer l gg

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, ENCLOSURE l

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BRLLEFONTE NUCLEAR PLANT UNITS 1 AND 2 PIPINC COMPONENT SUPPORT WELDS DO NOT NEET INSPRCTION CRITERIA .

BLRD-50-438/85-28 AND BLRD-50-439/85-26 j NCR 4490 g 10 CFR 50.55(e) j FINAL REPORT 3

Descr.iption of_ Deficiency l As a result of investigations associated with NCR 1968, como of the welding

!. workmanship on piping component supports, which were approved during the j inspection period of May 1, 1980 through July 31, 1981, were found to not meet the inspection criteria specified in G-29C and C-29N. The deficient welds were common to quality-related piping component support welds. Similar deficiencies have been documented and reported as 10 CFR 50.55(e) items, per nonconformance reports (NCRs) 1173, 1188, 1203, 1563, 1888, and 1968.

-This deficiency was caused by inadequate training of the weld inspectors, with

, respect to visual examinations.

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I Safety Implications i

j TVA has conducted a sampling of approximately 500 piping-component support I welds. A total of 87 welds was identified as not meeting the acceptance i criteria specified in General Construction Specifications C-29C and C-29N.

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2 TVA's Office of Engineering (DE) has evaluated the 87 rejected welds and determined they may be "used as is." Also, OE determined the sample to be

, sufficient for completion of MCR 4490. Based on this disposLLion, NCR 4490  ;

has been closed.

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Since the component pipe supports are designed for the allowable deflection 4 limit rather than the allowable stress limit, the weld stresses are very low; i therefore, the weld defects described by NCR 4490 will have only minimum effect on the structural capability of the supports. TVA concluden that the

] safety of the plant would not have been jeopardized if these welds and other j

i similar welds had not been reinspected, or if they remain uncorrected. The welds are adequate to provide the major requirements for structural j integrity. Consequently, TVA no longer considers this deficiency to be j reportable under the provisions of 10 CFR 50.55(e).

l l The action required to prevent recurrence relative to this nonconformance

has already been implemented based on

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1. Visual QA certification of all Welding QC inspectors was accomplished between September and October 1981.

l 2. Results of visumi inspection audits being performed on a continuing basis

, in accordance with SOP-116-(implemented May 14, 1981) have indicated that 4

inspectors are accurately performing C-29C and C-29N inspections j properly. ,

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