ML060470328

Request for Additional Information Related to Relief Request CR-28

ML060470328
Person / Time
Site:	Dresden
Issue date:	02/22/2006
From:	Banerjee M Plant Licensing Branch III-2
To:	Crane C M Exelon Generation Co
Banerjee M, NRR/ADPT, 415-2277
References
TAC MC7068
Download: ML060470328 (4)

Text

February 22, 2006Mr. Christopher M. Crane, President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

DRESDEN NUCLEAR POWER STATION, UNIT 3 - REQUEST FORADDITIONAL INFORMATION RELATED TO RELIEF REQUEST CR-28 (TAC NO. MC7068)

Dear Mr. Crane:

By letter to the Nuclear Regulatory Commission (NRC) dated May 6, 2005, Exelon GenerationCompany, LLC requested relief from American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code,Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components," and the augmented examinations specified in 10 CFR 50.55a(g)(6)(ii)(A)(2), for the Dresden Nuclear Power Station, Units 2 and 3.The NRC staff is reviewing your submittal and has determined that additional information isrequired to complete the review. The specific information requested was e-mailed to your staff on January 25, 2006, and is addressed in the enclosure to this letter. During a discussion with your staff on February 7, 2006, it was agreed that you would provide a response to the RAI by March 10, 2006. The NRC staff considers that timely responses to requests for additional information helpensure sufficient time is available for staff review and contribute toward the NRC's goal ofefficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-2277.Sincerely,/RA/Maitri Banerjee, Senior Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket No. 50-249

Enclosure:

Request for Additional Informationcc w/encl: See next page Mr. Christopher M. Crane, PresidentFebruary 22, 2006 and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

DRESDEN NUCLEAR POWER STATION, UNIT 3 - REQUEST FORADDITIONAL INFORMATION RELATED TO RELIEF REQUEST CR-28 (TAC NO. MC7068)

Dear Mr. Crane:

By letter to the Nuclear Regulatory Commission (NRC) dated May 6, 2005, Exelon GenerationCompany, LLC requested relief from American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code,Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components," and the augmented examinations specified in 10 CFR 50.55a(g)(6)(ii)(A)(2), for the Dresden Nuclear Power Station, Units 2 and 3.The NRC staff is reviewing your submittal and has determined that additional information isrequired to complete the review. The specific information requested was e-mailed to your staff on January 25, 2006, and is addressed in the enclosure to this letter. During a discussion with your staff on February 7, 2006, it was agreed that you would provide a response to the RAI by March 10, 2006. The NRC staff considers that timely responses to requests for additional information helpensure sufficient time is available for staff review and contribute toward the NRC's goal ofefficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-2277.Sincerely,/RA/Maitri Banerjee, Senior Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket No. 50-249

Enclosure:

Request for Additional Informationcc w/encl: See next page DISTRIBUTION:PUBLICLPLF R/FRidsNrrDorlLplfRidsNrrPMMBanerjeeRidsNrrLADClarkeRidsAcrsAcnwMailCenterRidsOGCRpRidsRgn3MailCenterRidsNrrDorlDprRidsNrrDciDpr ADAMS Accession Number: ML060470328OFFICELPLIII-2/PMDCI/CVIB/BCLPLIII-2/BC (A)NAMEMBanerjeeMMitchellMLandau DATE2/22/062/22/062/22/06OFFICIAL RECORD COPY Dresden Nuclear Power Units 2 and 3 cc:

Site Vice President - Dresden Nuclear Power StationExelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765Dresden Nuclear Power Station Plant ManagerExelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765Regulatory Assurance Manager - DresdenExelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765U.S. Nuclear Regulatory CommissionDresden Resident Inspectors Office 6500 N. Dresden Road Morris, IL 60450-9766ChairmanGrundy County Board Administration Building 1320 Union Street Morris, IL 60450Regional Administrator, Region IIIU.S. Nuclear Regulatory Commission Suite 210 2443 Warrenville RoadLisle, IL 60532-4351Illinois Emergency Management Agency Division of Disaster Assistance &

Preparedness 110 East Adams Street Springfield, IL 62701-1109Document Control Desk - LicensingExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Senior Vice President of OperationsExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Vice President - Licensing and Regulatory Affairs Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Director - Licensing and Regulatory AffairsExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Assistant General CounselExelon Generation Company, LLC 200 Exelon Way Kennett Square, PA 19348Manager Licensing - Dresden, Quad Cities and ClintonExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 EnclosureREQUEST FOR ADDITIONAL INFORMATIONDRESDEN NUCLEAR POWER STATION, UNIT 3DOCKET NO. 50-249In reviewing the Exelon Generation Company's (Exelon's) submittal dated May 8, 2005, relatedto the request for relief from American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code,Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components," and the augmented examinations specified in 10 CFR 50.55a(g)(6)(ii)(A)(2), for the Dresden Nuclear Power Station, Unit 3 (Dresden 3), the NRC staff has determi ned that thefollowing information is needed in order to complete its review:By letter dated March 23, 2005, the NRC approved an alternative Reactor PressureVessel (RPV) weld examination pursuant to Title 10 of the Code of Federal Regulations (10 CFR), Section 50.55a(a)(3)(I) and 10 CFR 50.55a(g)(6)(ii)(A)(5) for Dresden Nuclear Power Station, Units 2 and 3 (Dresden 2 and 3) that allows permanent deferral of the requirements to perform a volumetric examination of the RPV circumferential welds for the extended operating license terms for Dresden 2 and 3. This alternative requires examinations of essentially 100 percent of all longitudinal welds and examinations of approximately 2 to 3 percent of the circumferential welds at their points of intersectionwith the longitudinal welds.In proposed Relief Request CR-28, Exelon did not indicate the extent to which thereduced examination volumes for the RPV longitudinal welds, as specified in the attachment to their May 6, 2005, letter, included the points of intersection with the circumferential welds. Please provide supplemental information indicating whether the reduced examination volumes for the specified Dresden 3 RPV longitudinal welds included all of the points of intersection with the circumferential welds. In addition, please indicate whether 2 to 3 percent volumetric coverage of the circumferential welds in the vicinity of the points of intersection with the longitudinal welds was achieved.