ML20083P630

Second Revised Final Deficiency Rept Re Welds on Component Cooling Water HX Mfg by Joseph Oat Corp.Initially Reported on 810306.Defects Removed by Grinding.Also Reported Per Part 21

ML20083P630
Person / Time
Site:	Yellow Creek
Issue date:	01/28/1983
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 8302030551
Download: ML20083P630 (2)

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TENNESSEE VALLEY AUTHORITY

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4M ^dhes sut'Sk$ e b b eE 1S' January 28, 1983 YCRD-50-566/81-06 w YCRD-50-567/81-04  ;

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U.S. Nuclear Regulatory Commission Region II 2 ATTN: James P. O'Reilly, Regional Administrator =

101 Marietta Street, Suite 3100 . _

Atlanta, Georgia 30303

Dear Mr. O'Reilly:

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YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2 - DEFICIENT WELDS ON COMPONENT COOLING WATER HEAT EXCHANGERS - YCRD-50-566/81-06, YCRD-50-567/81 SECOND REVISED FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. V. Crlenjak on March 6,1981 in accordance with 10 CFR 50.55(e) as NCR YC-160. This was followed by our first interim report dated April 7, 1981, our final report dated October 6, 1981, our revised final report dated November 4, 1981, and our first supplemental report dated December 29, 1981.

Enclosed is our second revised final report. TVA does not now consider the subject nonconforming condition adverse to the safe operation of the plant.

Therefore, TVA will amend our records to delete the subject nonconformance as a 10 CFR 50.55(e) or 10 CFR 21 item.

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, Man ger Nuclear Licensing Enclosure cc: Mr. Richard C. DeYoung, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 UVyIcjAL COPY d

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An Equal Opportunity Employer

ENCLOSURE YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2 DEFICIENT WELDS ON COMPONENT COOLING WATER HEAT EXCHANGERS YCRD-50-566/81-06, YCRD-50-567/81-04 10 CFR 50.55(e)

SECOND REVISED FINAL REPORT Description of Deficiency During an NRC inspection of the component cooling water heat exchangers at the Yellow Creek Nuclear Plant, it was reported that various welding deficiencies existed on the welds and base metal for the 24" stainless steel nozzles and manhole to exchanger welds. The various deficiencies noted were arc strikes, weld splatter, slag, overlap, lack of fusion, undercut, and excessive weld metal. The component cooling water heat exchangers were manufactured by the Joseph Oat Corporation, Camden, New Jersey, and purchased by TVA from Combustion Engineering, Windsor, Connecticut..

Safety Implications The Component Cooling System (CCS) is designed to remove heat from the reactor auxiliary components and engineered safety features components to the Essential Raw Cooling Water System. The component cooling water heat exchangers represent an important part of the CCS. Failure or partial failure of these heat exchangers would decrease the efficiency and effectiveness of the CCS, thus affecting the proper operation of auxiliary as well as Engineered Safety Feature (ESP) system components.

Corrective Action TVA has completed its investigation of the subject deficiency. The defects were removed by grinding. After grinding a visual examination was performed.

All deficiencies were evaluated by TVA and the vendor against the applicable specifications and found to be acceptable. The final wall thicknesses (after grinding) were also evaluated and found to meet requirements. Therefore, TVA believes that defects, as described above, were cosmetic in nature and cause no adverse safety implications. We no longer consider 10 CFR 50.55(e) or 10 CFR 21 applicable.

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