ML063340555
| 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.
5000 Llom~nion Boulevard, Glen Allcn, VA 231160 November 30, 2006 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 p
Dominion" Serial No.:
06-1 024 NL&OS/GDM RO 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 Row 34 Column 27 Maximum Measured Throug h-Wall Penetration Row 35 Column 27 foreign object 1
21 998.1 9691 0.1 72%
42%
Row 41 Column 27 Row 41 Column 29 Plugging Attribute 49%
31 %
Comments Wear caused by foreign object Wear caused by NIA N/A 70%
42%
1 foreign object-Hot leg tube end damage Wear caused by Tube end previously damaged during plug removal
Serial No. 09-1 024 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 11 555 Rockville Pike Mail Stop 8G9A Rockville, Maryland 20852 Mr. L. N. Olshan NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North 1 1 555 Rockville Pike Mail Stop 8G9A Rockville, Maryland 20852