ML063340555

Steam Generator Tube Plugging Report

ML063340555
Person / Time
Site:	Surry
Issue date:	11/30/2006
From:	Funderburk C Dominion Resources Services, Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
06-1024
Download: ML063340555 (2)

Text

Dominion Resources Services, Inc.

p 5000 L l o m ~ n i o nBoulevard, Glen Allcn, VA 231160 Dominion" November 3 0 , 2006 U.S. Nuclear Regulatory Commission Serial No.: 06-1024 Attn: Document Control Desk NL&OS/GDM RO Washington, DC 20555 Docket No.: 50-281 License No.: DPR-37 VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNIT 2 STEAM GENERATOR TUBE PLUGGING REPORT Virginia Electric and Power Company conducted planned eddy current inspections on the "A" steam generator during the Surry Unit 2 fall 2006 refueling outage. In accordance with Surry Power Station Technical Specification 4.19.F.a, this letter provides notification of the number of steam generator tubes that were plugged during the outage. As indicated in the table below, a total of four tubes were plugged in the "A" steam generator. Three (3) tubes were plugged as a result of volumetric indications at the cold leg top of tubesheet that were caused by a foreign object(s). A fourth tube was plugged due to an indication at the tube end. Tube plugging decisions were based on a depth sizing technique that is conservative for the flaws in question (i.e., Revision 6 of the EPRl Guidelines, Appendix H, technique # 21998.1). The indications were also sized using a separate technique (i.e., technique # 96910.1), which, although still conservative, is considered a more accurate sizing technique based on the length of these indications. Depth estimates obtained from both techniques are provided in the table below.

Location Maximum Measured Plugging Attribute Comments Through-Wall Penetration Row 34 Column 27 21998.1 72%

96910.1 42% Wear caused by foreign object 1

Row 35 Column 27 49% 31% Wear caused by foreign object-Row 41 Column 27 NIA N/A Hot leg tube end Tube end previously damage damaged during plug removal Row 41 Column 29 70% 42% Wear caused by foreign object 1

Serial No. 09-1024 Docket No. 50-281 Page 2 of 2 No new commitments are being made as a result of this letter. If you have any questions regarding the information provided herein, please contact Mr. Gary D. Miller at (804) 273-2771.

Sincerely,

-c. L. ~und&burk- Director Nuclear Licensing and Operations Support Dominion Resources Services, Inc.

For Virginia Electric and Power Company cc: U.S. Nuclear Regulatory Commission Region II Sam Nunn Federal Atlanta Center 61 Forsyth Street, SW Suite 23T85 Atlanta, Georgia 30303 Mr. N. P. Garrett NRC Senior Resident Inspector Surry Power Station Mr. S. P. Lingam NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 8G9A Rockville, Maryland 20852 Mr. L. N. Olshan NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 8G9A Rockville, Maryland 20852