ML040690956
| ML040690956 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 03/12/2004 |
| From: | Dick G NRC/NRR/DLPM/LPD3 |
| To: | Crane C Exelon Generation Co |
| Dick G F, NRR/DLPM, 415-3019 | |
| References | |
| TAC MB9968 | |
| Download: ML040690956 (5) | |
Text
March 12, 2004 Mr. Christopher M. Crane, President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
EVALUATION OF STEAM GENERATOR INSERVICE INSPECTION
SUMMARY
REPORT, BYRON, UNIT 2 (TAC NO. MB9968)
Dear Mr. Crane:
By letters dated October 8, 2002, and December 10, 2002, Exelon Generation Company, LLC (Exelon) submitted a steam generator (SG) tube repair report and an inservice inspection summary report respectively. These reports are related to the steam generator inspections performed during the Cycle 10 refueling outage (Fall 2002) in accordance with the plants technical specifications (TS). The December 10, 2002, report also includes results from the forced outage SG inspection conducted in June 2002.
Byron Station, Unit 2, has four Westinghouse Model D-5 SGs, each one containing thermally treated Inconel-600 U-bend tubes. The tubes are hydraulically expanded into the full length of the tubesheet. The tubes are supported by stainless steel quatrefoil support plates and chrome plated Inconel-600 anti-vibration bars. During the Cycle 10 refueling outage, Exelon conducted a 100 percent full-length eddy current bobbin coil inspection and a 75 percent plus-point inspection of the hot leg top of tubesheet and low row U-bend regions on all four SGs. Of the total population of hot leg indications that were greater than five volts, 75 percent were also inspected with the plus-point probe in all SGs. In addition, a 25 percent plus-point inspection of the pre-heater baffle plate expansions was performed in the B, C, and D SGs.
In addition, eddy current inspections were conducted in June 2002, during a forced outage caused by primary to secondary leak in SG C. The primary to secondary leak was attributed to tube wear caused by a foreign object. The inspections which were limited to the leaking tube and tubes surrounding the leaking tube were inspected with a bobbin coil probe and a plus-point probe.
As a result of the Fall 2002 inspection, a total of 14 tubes was repaired by tube plugging. The modes of tube degradation found during the insertion were anti-vibration bar wear, foreign object wear, and pre-heater wear.
C. Crane 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 50-455 cc: See next page
C. Crane 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 50-455 cc: See next page DISTRIBUTION:
PUBLIC PDIII/2 r/f LMarsh/ELeeds GDick AMendiola PCoates OGC ACRS AStone, RIII LLund MMurphy DHills, RIII MChawla ADAMS Accession Number: ML040690956 OFFICE PM:PD3-2 LA:PD3-2 SC:PD3-2 NAME GDick PCoates AMendiola DATE 03/10/04 03/10/04 03/12/04 OFFICIAL RECORD COPY
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 of Operations - Mid-West Pressurized Water Reactors 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 and Regulatory Affairs 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 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 and Byron Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555