ML051600111

Steam Generator Tube Inspection Report

ML051600111
Person / Time
Site:	Surry
Issue date:	05/31/2005
From:	Funderburk C Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
05-339
Download: ML051600111 (2)

Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 May 31, 2005 U. S. Nuclear Regulatory Commission Serial No.05-339 Attention: Document Control Desk NL&OS/vlh R1 Washington, D.C. 20555 Docket No. 50-281 License No. DPR-37 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)

SURRY POWER STATION UNIT 2 STEAM GENERATOR TUBE INSPECTION REPORT Planned eddy current inspections were conducted on the "C" steam generator during the Surry Unit 2 spring 2005 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. The eight (8) tubes noted in the table below were plugged in "C" steam generator as a result of volumetric type indications at the hot leg top of tubesheet. The indications were caused by loose parts.

The two largest indications were stabilized with a cable type stabilizer due to the inability to locate and remove the part. Determination of the tubes to be plugged was based on a conservative sizing technique (Revision 6 of the EPRI guidelines, Appendix H, technique #21998.1). This technique is considered overly conservative for volumetric dimensions greater than 0.25-inch in length. Therefore, indications were also sized using an additional sizing technique (technique #96910.1). Although less conservative, this technique is considered to provide a more accurate representation of actual tube condition based on the size and length of the indication. Even though sizing technique #96910.1 was used to get the most accurate indication sizing attainable, the most conservative indication sizing technique (#21998.1) was used for determining which tubes required plugging.

Steam Generator "C" The following eight (8) tubes were plugged in "C" steam generator as a result of this inspection:

Location Plugging Attribute Maximum Measured Comments Through-Wall Penetration 21998.1 96910.1 Row 31 Wear caused by 98% 56% Loose Part Column 28 foreign object Indication Row 32 Wear caused by 90% 52% Loose Part Column 28 foreign object Indication

Row 35 Wear caused by 42% Loose Part Column 17 foreign object Indication Row 35 Wear caused by 42% 25% Loose Part Column 70 foreign object Indication Row 35 Wear caused by 63% 35% Loose Part Column 73 foreign object Indication Row 36 Wear caused by 59% 34% Loose Part Column 70 foreign object Indication Row 37 Wear caused by 49% 26% Loose Part Column 36 foreign object Indication Row 41 Wear caused by 41% Loose Part Column 61 foreign object I Indication No new commitments are being made as a result of this letter. If you have any questions concerning these results, please contact Mr. Gary Miller at (804) 273-2771.

Very truly yours, C. L. Funderburk, Director Nuclear Licensing & Operations Support Dominion Resources Services, Inc. for Virginia Electric and Power Company cc: U. S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, Georgia 30303-89-31 Mr. N. P. Garrett NRC Senior Resident Inspector Surry Power Station Mr. S. R. Monarque U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738