ML042570498
| ML042570498 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 09/15/2004 |
| From: | Dick G NRC/NRR/DLPM/LPD3 |
| To: | Crane C Exelon Generation Co |
| Dick G F, NRR/DLPM, 415-3019 | |
| References | |
| TAC MC3737 | |
| Download: ML042570498 (5) | |
Text
September 15, 2004 Mr. Christopher M. Crane, President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING STEAM GENERATOR INSERVICE INSPECTION REPORT FOR THE SPRING 2004 OUTAGE - BYRON STATION, UNIT 2 (TAC NO. MC3737)
Dear Mr. Crane:
By letters dated April 17, 2004 (ML041170314), and June 23, 2004 (ML041830404) Exelon Generation Company, LLC (Exelon), in accordance with technical specification 5.6.9, submitted the results of the steam generator inspections that were completed during the Byron Station, Unit 2, Cycle 11 refueling outage.
During the course of the U.S. Nuclear Regulatory Commission staffs review of the results, we have found that additional information is needed in order to complete the review. The staffs questions are included in the enclosed RAI. Please provide the response to the questions within 60 days of receipt of this letter. The questions and the response schedule have been discussed with members of the Exelon staff.
Sincerely,
/RA/
George F. Dick, Jr., Project Manager, Section 2 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. STN 50-455
Enclosure:
As stated cc w/encl: See next page
September 15, 2004 Mr. Christopher M. Crane, President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING STEAM GENERATOR INSERVICE INSPECTION REPORT FOR THE SPRING 2004 OUTAGE - BYRON STATION, UNIT 2 (TAC NO. MC3737)
Dear Mr. Crane:
By letters dated April 17, 2004 (ML041170314), and June 23, 2004 (ML041830404) Exelon Generation Company, LLC (Exelon), in accordance with technical specification 5.6.9, submitted the results of the steam generator inspections that were completed during the Byron Station, Unit 2, Cycle 11 refueling outage.
During the course of the U.S. Nuclear Regulatory Commission staffs review of the results, we have found that additional information is needed in order to complete the review. The staffs questions are included in the enclosed RAI. Please provide the response to the questions within 60 days of receipt of this letter. The questions and the response schedule have been discussed with members of the Exelon staff.
Sincerely,
/RA/
George F. Dick, Jr., Project Manager, Section 2 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. STN 50-455
Enclosure:
As stated cc w/encl: See next page DISTRIBUTION:
PUBLIC PDIII/2 r/f AMendiola PCoates GDick OGC ACRS AStone, RIII TMarsh/JLyons KKarwoski MMurphy ADAMS Accession Number: ML042570498 OFFICE PM:PDIII-2 LA:PDIII-2 SC:PDIII-2 NAME GDick PCoates AMendiola DATE 09/14/04 N/A 09/15/04 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
REQUEST FOR ADDITIONAL INFORMATION STEAM GENERATOR INSERVICE INSPECTION REPORT RELATED TO CYCLE 11 REFUELING OUTAGE EXELON GENERATION COMPANY, LLC BYRON STATION, UNIT 2 DOCKET NO. STN 50-455 By letters dated April 17, 2004 (ML041170314), and June 23, 2004 (ML041830404), Exelon Generation Company, LLC, the licensee for Byron Station, Unit 2, submitted reports summarizing the steam generator tube inspections performed at Byron 2, Unit 2 during their 2004 refueling outage.
In order for the staff to complete its review, responses to the following questions are requested:
1.
During the 2002 and 2004 refueling outages at Byron 2, Unit 2, a number of tubes were reported with indications of wear at the anti-vibration bars (AVBs). The results from the 2002 outage were provided in a letter dated December 10, 2002 (ML023520084). The staff compared the number of indications detected during the 2002 and 2004 outages, and noticed that for many of the steam generators that the number of tubes with wear at the AVBs and the number of indications appears to have declined without a commensurate amount of tube plugging. Please discuss the reasons for the trends in this data. In addition, discuss whether the results of the current inspection are compared with those of the previous inspection to ensure that all previously reported flaws are appropriately identified and dispositioned (or whether this practice will be implemented in future inspections). Please discuss whether the growth rates for the wear indications at the AVBs are consistent with past inspections.
2.
A number of tubes were reported with indications at the 7th cold-leg tube support plate (07C). Many of these indications appear to be in the periphery of the tube bundle near the T-slot." Please clarify the nature and cause of these indications including the technical basis for the conclusions.