ML20070N281

Forwards Supplemental Response to IE Bulletin 79-13,Rev 12, Consisting of Results of Augmented Insp of Feedwater Sys Piping & Supports.Radiographic & Ultrasonic Exams Performed. Const Radiographs Reviewed for Compliance W/Bulletin

ML20070N281
Person / Time
Site:	Sequoyah
Issue date:	12/29/1982
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-SSINS-6820 IEB-79-13, NUDOCS 8301250462
Download: ML20070N281 (2)

Text

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J.c TENNESSEE VALLEY AUTHORITY

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- ' CH ATTA NOOG A. TENNESSEE 37401 400 Chestnut Street Tower II

3 Jtm 3 Pl.0 2 December 29, 1982 U.S. Nuclear Regulatory Commission Region II Attn:

Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 - 0FFICE OF INSPECTION AND ENFORCEMENT BULLETIN 79-13 REVISION 2 - RII: JP0 50-327, 50-328 - SUPPLEMENTAL

RESPONSE

Irk my January 31, 1980 letter to you, we agreed to perform the inspections required by item 2 of the bulletin during the first refueling outage for the respective units. A subsequent request for relief from the inspections was submitted by my September 15, 1982 letter to you. Enclosed are the results of the augmented inspection of the feedwater system piping and supports.

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

Very truly yours, TENNESSEE VALLEY AUTHORITY

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L. M. Mills, Manager Nuclear Licensing Enclosure cc:

Mr. Richard C. DeYoung, Director (Enclosure )

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.

20555 8301250462 821229 DR ADOCK 05000327 PDR Ecuas occo<turoty Errprover w

ENCLOSURE SEQUOYAH NUCLEAR PLANT RESULTS OF AUGMENTED INSPECTION OF FEEDWATER SYSTEM PIPING AND SUPPORTS REQUIRED BY NRC-0IE BULLETIN 79-13, REVISION 2 A radiographic examination was performed on the feedwater nozzle-to-pipe welds, the transition piece, and the transition piece-to-pipe welds and adjacent base metal equal to two-wall thicknesses. Also, a radiographic examination was performed on an area of base metal of the main feedwater line beginning at the centerline of the auxiliary feedwater to main feed-water weld and extending downstream one-pipe diameter. Evaluation of the radiographs was done in accordance with ASME Section III, Subsection NC, Article NC-5000, to 2-2T quality level in lieu of table NC-5111-1.

A review of the radiographs revealed no indication of cracking.

The construction radiographs of the feedwater piping welds to the first support, excluding those listed above, were reviewed for compliance with the bulletin. The radiographs met the bulletin requirements (i.e., 2-2T quality level, weld quality and technique) except in some instances where the base metal coverage of two-wall thicknesses was not attained on both sides of the weld. Since the thermal and geometric conditions do not exist at these locations to support stratification and striping and the radio-graphs were evaluated to the 2-2T quality level, no additional radiography was performed on these welds.

Because of the limited access and the configuration of the feedwater line-to-containment penetration welds an ultrasonic examination was performed in lieu of radiography. The ultrasonic examination was performed in accordance with TVA procedure N-UT-18, Revision.2, which meets the requirements set forth by the ASME Boiler and Pressure Vessel Code,Section XI, 1977 Edition, Summer 1978 Addenda. The ultrasonic examination revealed no indication of cracking.

The radiographic and ultrasonic examination reports will be retained in permanent storage at the plant site.

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