ML043270319

Review of Steam Generator Tube Inspection Reports for the Fall 2003 Outage

ML043270319
Person / Time
Site:	Braidwood
Issue date:	12/02/2004
From:	Dick G NRC/NRR/DLPM/LPD3
To:	Crane C Exelon Generation Co
Dick G F, NRR/DLPM, 415-3019
References
TAC MC2104
Download: ML043270319 (5)

Text

December 2, 2004 Mr. Christopher M. Crane, President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

BRAIDWOOD STATION, UNIT 2 - REVIEW OF STEAM GENERATOR TUBE INSPECTION REPORTS FOR THE FALL 2003 OUTAGE (TAC. NO. MC2104)

Dear Mr. Crane:

By letters dated November 24, 2003 (ML033360656) and February 12, 2004 (ML040540452),

Exelon Generation Company (Exelon) submitted the steam generator tube inspection summary reports for the fall 2003 outage at Braidwood Station, Unit 2 (Braidwood 2) in accordance with the plants technical specifications (TSs).

Braidwood 2 has four Westinghouse model D5 steam generators (SGs). Each SG contains 4,570 thermally treated Alloy 600 tubes. Each tube has a nominal outside diameter of 0.750-inch and a nominal wall thickness of 0.043-inch. The tubes were hydraulically expanded at both ends for the full length of the tubesheet and are supported by a number of stainless steel tube supports with quatrefoil shaped holes. The U-bend region of the tubes to be installed in rows 1 through 9 were thermally stress relieved after bending.

Of particular note during the inspections, Exelon identified four axially oriented indications indicative of outside diameter stress corrosion cracking (ODSCC) located at the hot-leg tube support plate intersections. These indications were observed in three tubes (i.e., one tube had two indications) and each of the tubes had an offset in the eddy current data, similar to that observed at Seabrook Nuclear Power Station (refer to U. S. Nuclear Regulatory Commission (NRC) Information Notice 2002-21, Axial Outside Cracking Affecting Thermally Treated Alloy 600 Steam Generator Tubing dated June 25, 2002, and its supplement dated April 1, 2003, for additional details). All tubes containing ODSCC indications were removed from service by mechanical tube plugging.

C. Crane Based on the information provided, the NRC staff concludes that the Exelon provided the required information outlined by their TSs and that no additional follow-up is required at this time.

Sincerely,

/RA/

George F. Dick, Jr., Project Manager, Section 2 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. STN 50-457 cc: See next page

C. Crane Based on the information provided, the NRC staff concludes that the Exelon provided the required information outlined by their TSs and that no additional follow-up is required at this time.

Sincerely,

/RA/

George F. Dick, Jr., Project Manager, Section 2 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. STN 50-457 cc: See next page DISTRIBUTION:

PUBLIC PDIII/2 r/f LLund OGC YDiaz KKarwoski GSuh ACRS PCoates TTongue, RIII GDick MMurphy ADAMS Accession Number: ML043270319 OFFICE PM:PDIII-2 LA:PDIII-2 SC:PD3-2 NAME GDick PCoates GSuh DATE 12/02/04 12/01/04 12/02/04 OFFICIAL RECORD COPY

Braidwood Station Units 1 and 2 cc:

Regional Administrator, Region III Illinois Emergency Management U.S. Nuclear Regulatory Commission Agency 801 Warrenville Road Division of Disaster Assistance &

Lisle, IL 60532-4351 Preparedness 110 East Adams Street Document Control Desk - Licensing Springfield, IL 62701-1109 Exelon Generation Company, LLC 4300 Winfield Road Chairman Warrenville, IL 60555 Will County Board of Supervisors Will County Board Courthouse Mr. Dwain W. Alexander, Project Manager Joliet, IL 60434 Westinghouse Electric Corporation Energy Systems Business Unit Attorney General Post Office Box 355 500 S. Second Street Pittsburgh, PA 15230 Springfield, IL 62701 Joseph Gallo George L. Edgar Gallo & Ross Morgan, Lewis and Bockius 1025 Connecticut Ave., NW, Suite 1014 1111 Pennsylvania Ave, NW Washington, DC 20036 Washington, DC 20004 Ms. Bridget Little Rorem Braidwood Station Plant Manager Appleseed Coordinator Exelon Generation Company, LLC 117 N. Linden Street 35100 S. Rt. 53, Suite 84 Essex, IL 60935 Braceville, IL 60407-9619 Howard A. Learner Site Vice President - Braidwood Environmental Law and Policy Exelon Generation Company, LLC Center of the Midwest 35100 S. Rt. 53, Suite 84 35 East Wacker Dr., Suite 1300 Braceville, IL 60407-9619 Chicago, IL 60601-2110 Senior Vice President, Nuclear Services U.S. Nuclear Regulatory Commission Exelon Generation Company, LLC Braidwood Resident Inspectors Office 4300 Winfield Road 35100 S. Rt. 53, Suite 79 Warrenville, IL 60555 Braceville, IL 60407 Vice President of Operations - Mid-West Ms. Lorraine Creek Pressurized Water Reactors RR 1, Box 182 Exelon Generation Company, LLC Manteno, IL 60950 4300 Winfield Road Warrenville, IL 60555 Chairman, Ogle County Board Post Office Box 357 Oregon, IL 61061

C. Crane Braidwood Station Units 1 and 2 Regulatory Assurance Manager - Braidwood Exelon Generation Company, LLC 35100 S. Rt. 53, Suite 84 Braceville, IL 60407-9619 Director - Licensing and Regulatory Affairs Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Associate General Counsel Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Vice President - Licensing and Regulatory Affairs Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Manager Licensing - Braidwood, Byron and LaSalle Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555