ML043270319
| ML043270319 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  (NPF-077) |
| 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 U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, IL 60532-4351 Document Control Desk - Licensing Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Mr. Dwain W. Alexander, Project Manager Westinghouse Electric Corporation Energy Systems Business Unit Post Office Box 355 Pittsburgh, PA 15230 Joseph Gallo Gallo & Ross 1025 Connecticut Ave., NW, Suite 1014 Washington, DC 20036 Ms. Bridget Little Rorem Appleseed Coordinator 117 N. Linden Street Essex, IL 60935 Howard A. Learner Environmental Law and Policy Center of the Midwest 35 East Wacker Dr., Suite 1300 Chicago, IL 60601-2110 U.S. Nuclear Regulatory Commission Braidwood Resident Inspectors Office 35100 S. Rt. 53, Suite 79 Braceville, IL 60407 Ms. Lorraine Creek RR 1, Box 182 Manteno, IL 60950 Illinois Emergency Management Agency Division of Disaster Assistance &
Preparedness 110 East Adams Street Springfield, IL 62701-1109 Chairman Will County Board of Supervisors Will County Board Courthouse Joliet, IL 60434 Attorney General 500 S. Second Street Springfield, IL 62701 George L. Edgar Morgan, Lewis and Bockius 1111 Pennsylvania Ave, NW Washington, DC 20004 Braidwood Station Plant Manager Exelon Generation Company, LLC 35100 S. Rt. 53, Suite 84 Braceville, IL 60407-9619 Site Vice President - Braidwood Exelon Generation Company, LLC 35100 S. Rt. 53, Suite 84 Braceville, IL 60407-9619 Senior Vice President, Nuclear Services Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Vice President of Operations - Mid-West Pressurized Water Reactors Exelon Generation Company, LLC 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