ML20039E147

First Supplemental Rept Re Deficient Welds on Component Cooling Water Heat Exchangers,Initially Reported 810306. Further Insp Determined Defects Advanced Beyond Superficial. NRC to Be Informed of Actions.Also Reported Per Part 21

ML20039E147
Person / Time
Site:	Yellow Creek
Issue date:	12/29/1981
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8201060581
Download: ML20039E147 (2)

Text

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s t, e I ir TENNESSEE. VALLEY AUTMp(MgYAEGION t  ::

CHATTANOOGA. TENNESSEE b[do6NU, GEC HCi t 400 Chestnut Street Tower II Decemberh,0f9 YCRD-50-566/81-06 YCRD-50-567/81-04 Mr. James P. O'Reilly, Director Office of Inspection and Enforcement

, U.S. Nuclear Regulatory Commission Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303

Dear Mr. O'Reilly:

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 FIRST SUPPLEMENTAL REPORT The subject deficiency was initially reported to NP.J-0IE Inspector J. Crlenjak on March 6, 1981, in accordance with 10 CFR 50.55(e) as NCR YC-160. This as followed by our first inteelm report dated -

April 7,1981, our final report dated October 6. 1981, and our revised final report dated November 4,1981. Enclosed La our first supplemental ,

report. As discussed with R. V. Crlenjak by telephone on December 21, 1981, the reason for this report is that there is new evidence that further  ;

corrective actions may be necessary.- We consiner 10 CFR Part 21 to be applicable to this deficiency.

- If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688. co 7 os Very truly yours, ,9 -

N TENNE',SEE VALLEY AUTHORI g";3,WTO 'ch f 51982 > > j

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L'.'M. Mills, Manager

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2 Nuclear Regulation and Safety. _ g'(['

%s Enclosure F .co: Mr.. Richard C. DeYoung, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission <

Washington, DC 20555 OF1'IcIAL COPY 8201 f0 h S An Equal Opportunity Employer g

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

FIRST SUPPLEMENTAL 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 I

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.

Interim Progress On March 19, 1981, a field inspection was conducted of the component cooling water heat exchangers. The areas reported as having deficient welds were inspected by members of TVA, the Authorized Nuclear Inspector, and the representatives of the Combustion Engineering Company and the Joseph Oat Company.

As repoeted in TVA's revised final report, grinding of the subject welds has taken place. However, the defects can no longer be said to be superficial. Because there is now evidence that extensive repairs may be necessary, TVA considers it appropriate to keep NRC abreast of all evaluations / corrective actions related to this deficiency.

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