ML033420151
| ML033420151 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 12/12/2003 |
| From: | Dick G NRC/NRR/DLPM/LPD3 |
| To: | Skolds J Exelon Generation Co, Exelon Nuclear |
| Dick G F | |
| References | |
| TAC MC0962 | |
| Download: ML033420151 (5) | |
Text
December 12, 2003 Mr. John L. Skolds, President Exelon Nuclear Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
EVALUATION OF STEAM GENERATOR INSERVICE INSPECTION
SUMMARY
REPORT, BYRON, UNIT 1 (TAC NO. MC0962)
By letters dated March 28 and June 13, 2002, Exelon Generation Company, LLC (Exelon) submitted a steam generator (SG) tube repair report and inservice inspection summary report respectively. These reports are related to the steam generator inspections performed during the Cycle 11 refueling outage (spring 2002) in accordance with the plants technical specifications (TS).
Byron Station Unit 1 has four Babcock & Wilcox replacement SGs which were installed during Cycle 8, each one containing 6633 thermally treated Inconel-690 U-bend tubes. The tubes are hydraulically expanded into the tubesheet and supported with stainless steel lattice grid structures and fan bars. During the Cycle 11 refueling outage, the licensee inspected the full length of 54 percent of the inservice tubes in all four SGs with a bobbin coil probe. This inspection consisted of 100 percent of the peripheral tubes with the exception of the tubes under the manipulator base plate, and 50 percent of the interior tubes. In addition, using a three-coil rotating probe, 25 percent of the tubes in each SG were inspected at the hot leg top of the tubesheet expansion transition region. Exelon also performed diagnostic examinations using a three-coil rotating probe of all bobbin signals. Lastly, a visual inspection was performed of all previously installed tube plugs.
As a result of the inspection, no tubes were plugged or repaired. Twelve tubes were determined to contain fan bar wear. These indications are summarized as; five in SG A, six in SG B, one in SG C, and none in SG D. The through wall depths ranged from 2 percent to 8 percent, which was less than the 40 percent through wall technical specification repair limit.
Based on the review of the information provided in the two submittals, the NRC staff concluded that Exelon provided the information required in accordance with the Byron TS and 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 50-454 cc: See next page
Byron Station Units 1 and 2 cc:
Regional Administrator, Region III U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, IL 60532-4351 Illinois Emergency Management Agency Division of Disaster Assistance &
Preparedness 110 East Adams Street Springfield, IL 62701-1109 Document Control Desk - Licensing Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Ms. C. Sue Hauser, 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 Howard A. Learner Environmental Law and Policy Center of the Midwest 35 East Wacker Drive Suite 1300 Chicago, IL 60601-2110 U.S. Nuclear Regulatory Commission Byron Resident Inspectors Office 4448 North German Church Road Byron, IL 61010-9750 Ms. Lorraine Creek RR 1, Box 182 Manteno, IL 60950 Chairman, Ogle County Board Post Office Box 357 Oregon, IL 61061 Mrs. Phillip B. Johnson 1907 Stratford Lane Rockford, IL 61107 Attorney General 500 S. Second Street Springfield, IL 62701 Byron Station Plant Manager Exelon Generation Company, LLC 4450 N. German Church Road Byron, IL 61010-9794 Site Vice President - Byron Exelon Generation Company, LLC 4450 N. German Church Road Byron, IL 61010-9794 Senior Vice President - Nuclear Services Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Vice President - Operations Support Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Chief Operating Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Chairman Will County Board of Supervisors Will County Board Courthouse Joliet, Illinois 60434
Byron Station Units 1 and 2 Director Licensing Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Regulatory Assurance Manager - Byron Exelon Generation Company, LLC 4450 N. German Church Road Byron, IL 61010-9794 Senior Counsel, Nuclear 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 and Byron Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
- per memo dated OFFICE PM:PD3-2 LA:PD3-2 SC:DE:EMCB*
SC:PD3-2 NAME GDick PCoates ALLund DPickett for, AMendiola DATE 12/11/03 12/11/03 11/6/03 12/11/03