ML070640090

Inspection and Mitigation of Alloy 600/82/182 Pressurizer Butt Welds - Supplemental Information

ML070640090
Person / Time
Site:	Watts Bar
Issue date:	02/27/2007
From:	Skaggs M Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML070640090 (3)

Text

e Tennessee Valley Authority, Post Office 2000, Spring City, Tennessee 37381-2000 Mike Skaggs 10 CFR 50.55a Site Vice President, Watts Bar Nuclear Plant FEB 2 7 2001 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Gentlemen:

In the Matter of

)

Docket No. 50-390 Tennessee Valley Authority

)

WATTS BAR NUCLEAR PLANT (WBN) UNIT 1 - INSPECTION AND MITIGATION OF ALLOY 600/82/182 PRESSURIZER BUTT WELDS - SUPPLEMENTAL INFORMATION This letter supersedes the commitments made in TVA's letter to NRC dated January 31, 2007 regarding the inspection and mitigation of Alloy 600/82/182 Butt Welds installed on the WBN Unit 1 Pressurizer. The subject letter and content were discussed with NRC staff members by telephone on February 21, 2007.

The WBN Unit 1 Pressuizer Alloy 600/82/182 Butt Welds were volumetrically inspected in accordance with Material Reliability Program (MRP)-1 39 requirements

[Performance Demonstration Initiative (PDI) qualified] during the fall 2006 refueling outage. No recordable indications were reported. The enclosure provides WBN Unit l's revised commitments concerning future inspections and results. TVA will notify the NRC in writing prior to making any changes to the commitments contained in the enclosure to this letter.

If there are any questions, please contact Jim Smith at (423) 365-1824.

Sincerely, Mike Skaggs Enclosure cc: See page 2 A(10 Printed on recycled paper

U.S. Nuclear Regulatory Commission Page 2 FEB 2 7 2007 Enclosure cc: (Enclosure):

U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW, Suite 23T85 Atlanta, Georgia 30303-8931 NRC Senior Resident Inspector U.S. Nuclear Regulatory Commission Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, TN 37381 Brendan T. Moroney, Project Manager U.S. Nuclear Regulatory Commission Mail Stop 08G9A One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739

ENCLOSURE LIST OF COMMITMENTS

1. Volumetric examinations of WBN Unit 1 unmitigated pressurizer Alloy 600/82/182 butt welds will be performed at a frequency of no more than four years between exams until the welds have been mitigated.

2. Details of the volumetric examination results including any corrective or mitigative actions taken for each unmitigated weld examined will be reported to NRC within 60 days of WBN Unit 1 restart.