ML082480690

Cycle 15 (U2C15) 90-day Steam Generator Report for Voltage-based Alternate Repair Criteria and W* Alternate Repair Criteria - Cover Letter

ML082480690
Person / Time
Site:	Sequoyah
Issue date:	08/27/2008
From:	James Smith Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML082480690 (2)

Text

Tennessee Valley Authority, Post Office Box 2000, Soddy-Daisy, Tennessee 37379-2000 August 27, 2008 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket No. 50-328 Tennessee Valley Authority (TVA)

SEQUOYAH NUCLEAR PLANT (SQN) - UNIT 2 - UNIT 2 CYCLE 15 (U2C15) 90-DAY STEAM GENERATOR (SIG) REPORT FOR VOLTAGE-BASED ALTERNATE REPAIR CRITERIA AND W* ALTERNATE REPAIR CRITERIA In accordance with SQN Unit 2 Technical Specification 6.9.1.16.2, SQN is providing the 90-day S/G report (Enclosure 1). The report contains results of voltage-based repair criteria that were applied during the U2C1 5 refueling outage S/G inspections. The voltage-based repair criteria are for axial outside diameter stress corrosion cracking (ODSCC) at tube support plate intersections. The report contains a condition monitoring assessment that demonstrates the GL 95-05 acceptance criteria are satisfied for Unit 2 at the end of Cycle 15 and an operational assessment that demonstrates that the GL 95-05 acceptance criteria are expected to continue to be satisfied through Cycle 16.

In accordance with SQN Unit 2 Technical Specification 6.9.1.16.4, SQN is providing the 90-day S/G report associated with the application of W* during the U2C1 5 refueling outage (Enclosure 2). The cumulative leak rates as calculated for W*, the GL 95-05 alternate repair criteria, and all other sources of primary to secondary accident-induced leakage were within the SQN Unit 2 limit (3.7 gallons per minute).

Printed on recycled paper

U. S. Nuclear Regulatory Commission Page 2 August 27, 2008 This letter does not contain TVA commitments. If you have any questions, please call me at (423) 843-7170.

Sincerely,

'---ýJames D. Smith Manager, Site Licensing and Industry Affairs Enclosures cc (Enclosures):

Mr. Brendan Moroney, Senior Project Manager U.S. Nuclear Regulatory Commission Mail Stop 08G-9a One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2739 I:License/Steam Generators/U2C1 5 90-Day SG Report