ML022590386
| ML022590386 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 09/18/2002 |
| From: | Dick G NRC/NRR/DLPM/LPD3 |
| To: | Scolds J Exelon Generation Co, Exelon Nuclear |
| Dick G F, NRR/DLPM, 415-3019 | |
| References | |
| TAC MB6310 | |
| Download: ML022590386 (7) | |
Text
September 18, 2002 Mr. John L. Skolds, President Exelon Nuclear Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
BYRON STATION, UNIT 2 - UPCOMING STEAM GENERATOR TUBE INSERVICE INSPECTION (TAC NO. MB6310)
Dear Mr. Skolds:
Inservice inspections of steam generator (SG) tubes play a vital role in assuring that adequate structural integrity of the tubes is maintained. As required by the plant Technical Specifications, reporting requirements range from submitting a special report, within 15 days following completion of each inservice inspection of SG tubes, that identifies the number of tubes plugged and/or repaired; to submitting a special report, within 12 months following completion of the inspection, that provides complete results of the SG tube inservice inspection. The special report containing the complete results shall include the following:
1.
Number and extent of tubes inspected.
2.
Location and percent of wall-thickness penetration for each indication of an imperfection.
3.
Identification of tubes plugged and/or repaired.
A telephone conference has been arranged with members of your staff to discuss the ongoing results of the SG tube inspections to be conducted during the upcoming Byron Station, Unit 2, refueling outage. This telephone call is expected to occur after the majority of the tubes have been inspected, but before the SG inspection activities have been completed. Attached is a list of discussion points to facilitate this telephone conference.
J. Skolds In response to a recommendation made in the Nuclear Regulatory Commissions Indian Point Nuclear Generating, Unit 2, Lessons Learned Task Group report, the staff plans to document a brief summary of the telephone call as well as any material that you may have provided to the staff in support of the call.
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
Enclosure:
List of Discussion Points cc w/encl: See next page
J. Skolds In response to a recommendation made in the Nuclear Regulatory Commissions Indian Point Nuclear Generating, Unit 2, Lessons Learned Task Group report, the staff plans to document a brief summary of the telephone call as well as any material that you may have provided to the staff in support of the call.
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
Enclosure:
List of Discussion Points cc w/encl: See next page DISTRIBUTION PUBLIC CKhan MHolmberg, Region III PDIII-2 Reading CLauron DJones, Region III AMendiola ZFu MChawla CRosenberg EMurphy GDick KKarwoski OGC JTsao ACRS ASmith GGrant, Region III AStone, Region III Accession No.: ML022590386 OFFICE PM:LPD3-2 LA:LPD3-2 EMCB SC:LPD3-2 NAME GDick CRosenberg LLund AMendiola DATE 09/16/02 09/16/02 09/17/02 09/18/02 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 Department of Nuclear Safety Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield, IL 62704 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 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 Mid-West Operations Support Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Senior Vice President Mid-West Regional Operating Group Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Byron Station Units 1 and 2 Director Licensing Mid-West Regional Operating Group 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 Mid-West Regional Operating Group 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
ENCLOSURE STEAM GENERATOR TUBE INSPECTION DISCUSSION POINTS PREPARED BY THE OFFICE OF NUCLEAR REACTOR REGULATION EXELON GENERATION COMPANY, LLC BYRON STATION, UNIT 2 DOCKET NO. STN 50-455 The following discussion points have been prepared to facilitate the phone conference arranged with the Exelon Generation Company, LLC, the licensee, to discuss the results of the steam generator (SG) tube inspections to be conducted during the upcoming Byron Station, Unit 2, refueling outage. This phone call is scheduled to occur towards the end of the planned SG tube inspection interval, but before the unit exits its refueling outage.
The staff plans to document a brief summary of the conference call as well as any material that the licensee provided to the staff in support of the call.
1.
Discuss whether any primary to secondary leakage existed in this unit prior to shutdown.
2.
Discuss the results of secondary side pressure tests.
3.
For each SG, provide a general description of areas examined, including the expansion criteria utilized and type of probe used in each area. Also, be prepared to discuss the inspection of the tube within the tubesheet, particularly the portion of the tube below the expansion/transition region.
4.
Provide a summary of the number of indications identified to-date of each degradation mode and SG tube location (e.g., tube support plate, top-of-tubesheet, etc.). Also provide information, such as voltages, and estimated depths and lengths of the most significant indications.
5 Describe repair/plugging plans for the SG tubes that meet the repair/plugging criteria.
6.
Discuss the previous history of SG tube inspection results, including any "look backs" performed, specifically for significant indications or indications where look backs are used in support of dispositioning (e.g., manufacturing burnish marks).
7.
Discuss, in general, new inspection findings (e.g., degradation mode or location of degradation new to this unit).
8.
If steam generators contain Alloy 600 thermally treated tubing, discuss actions taken (if any) based on Seabrooks recent findings.
9.
Discuss your use or reliance on inspection probes (eddy current or ultrasonic) other than bobbin and typical rotating probes, if applicable.
10.
Describe in-situ pressure test plans and results, if applicable and available, including tube selection criteria.
11.
Describe tube pull plans and preliminary results, if applicable and available; include tube selection criteria.
12.
Discuss the assessment of tube integrity for the previous operating cycle (i.e., condition monitoring).
13.
Discuss the assessment of tube integrity for next operating cycle (i.e., operational assessment).
14.
Provide the schedule for SG-related activities during the remainder of the current outage.