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MONTHYEARRS-09-133, Attachment 6, LaSalle, Unit 2, Nuclear Power Station Spent Fuel Storage Pool Criticality Safety Analysis with Neutron Absorbing Inserts and Without Boraflex2009-08-31031 August 2009 Attachment 6, LaSalle, Unit 2, Nuclear Power Station Spent Fuel Storage Pool Criticality Safety Analysis with Neutron Absorbing Inserts and Without Boraflex Project stage: Request ML0931705992009-12-0202 December 2009 Request for Withholding Information from Public Disclosure by Letter Dated 10/5/09 Project stage: Withholding Request Acceptance ML1009802092010-04-26026 April 2010 Request for Additional Information Related to License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks Project stage: RAI ML1011904862010-05-0303 May 2010 Notice of Meeting with Exelon, LaSalle, Units 1 and 2, to Discuss Response to Request for Additional Information License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Spent Fuel Pool Storage Racks Project stage: RAI ML1016502292010-06-10010 June 2010 Additional Information Supporting License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks Project stage: Other ML1016502862010-06-23023 June 2010 June 1, 2010, Summary of Meeting with Exelon Generation Co., LLC, on Responses to Request for Information License Amendment Request for the Use of Netco-SNAP-In Rack Inserts Project stage: RAI ML1028003592010-10-0707 October 2010 Notice of Public Meeting with Exelon Generation Company, LLC, Regarding LaSalle Netco Insert Request Project stage: Meeting ML1030004242010-10-28028 October 2010 Notice of Meeting with Exelon Genertion Company to Discuss the License Amendment Request to Allow Full Recovery of Spent Fuel Storage Rack Cells That Are Unusable Due to Boraflex Neutron Absorber Degradation Project stage: Meeting ML1030704842010-11-19019 November 2010 Summary of Public Meeting with Exelon Generation Company, LLC Regarding LaSalle Netco Insert Request Project stage: Meeting ML1030903782010-11-19019 November 2010 Licensee Handouts for LaSalle Meeting with Exelon to Discuss Netco Inserts Project stage: Meeting ML1032104992010-11-19019 November 2010 Request for Additional Information, Related to the Use of Neutron Absorbing Inserts Project stage: RAI RS-10-202, Additional Information Supporting License Amendment Request Re Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks2010-11-23023 November 2010 Additional Information Supporting License Amendment Request Re Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks Project stage: Request ML1034304232010-12-10010 December 2010 Request for Additional Information Related to the Use of Nuetron Absorbing Inserts Project stage: RAI RS-10-210, Additional Information Supporting License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks2010-12-14014 December 2010 Additional Information Supporting License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks Project stage: Request ML1034904622010-12-16016 December 2010 Notice of Meeting with Exelon Generation Company, LLC Regarding LaSalle Netco Insert Request Project stage: Meeting RS-10-216, Additional Information Supporting License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks2010-12-22022 December 2010 Additional Information Supporting License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks Project stage: Request ML1100503592010-12-29029 December 2010 NRC Meeting Slides for December 29, 2010, Public Conference Call with Exelon Generation Company Regarding LaSalle Netco Insert Request Project stage: Meeting ML1101300742011-01-11011 January 2011 Additional Information Supporting License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks Project stage: Request ML1100502552011-01-17017 January 2011 December 29, 2010, Summary of Public Conference Call with Exelon Generation Company, LLC, Regarding LaSalle Netco Insert Request Project stage: Other ML1101803312011-01-24024 January 2011 Proposed License Conditions Related to Use of Neutron Absorbers Project stage: Other RS-11-009, Additional Information Supporting License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks2011-01-24024 January 2011 Additional Information Supporting License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks Project stage: Request ML1102500512011-01-28028 January 2011 Issuance of Amendments Concerning Spent Fuel Neutron Absorbers Project stage: Approval RS-11-014, Additional Information Supporting License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks2011-01-28028 January 2011 Additional Information Supporting License Amendment Request Regarding the Use of Neutron Absorbing Inserts in Unit 2 Spent Fuel Pool Storage Racks Project stage: Request ML1104606172011-03-0404 March 2011 Request for Additional Inforamtion Related to the Use of Neutron Absorbing Inserts Project stage: Other RS-11-067, Response to Request for Additional Information Regarding Unit 2 Spent Fuel Pool Storage Racks2011-04-18018 April 2011 Response to Request for Additional Information Regarding Unit 2 Spent Fuel Pool Storage Racks Project stage: Response to RAI RS-11-109, Completion of License Condition 2.C.(30) Associated with Unit 2 Spent Fuel Pool Storage Racks2011-07-13013 July 2011 Completion of License Condition 2.C.(30) Associated with Unit 2 Spent Fuel Pool Storage Racks Project stage: Other RS-11-170, Completion of License Condition 2.C.(31) Associated with Unit 2 Spent Fuel Pool Storage Racks2011-10-20020 October 2011 Completion of License Condition 2.C.(31) Associated with Unit 2 Spent Fuel Pool Storage Racks Project stage: Other 2010-04-26
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Category:Letter
MONTHYEARIR 05000373/20230042024-01-24024 January 2024 County Station - Integrated Inspection Report 05000373/2023004 and 05000374/2023004 ML24024A1332024-01-24024 January 2024 Confirmation of Initial License Examination IR 05000373/20230122024-01-18018 January 2024 County Station - Biennial Problem Identification and Resolution Inspection Report 05000373/2023012 and 05000374/2023012 ML23354A2902024-01-0505 January 2024 Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0028 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting)) ML23360A6082023-12-27027 December 2023 County Station Request for Information for NRC Commercial Grade Dedication Inspection: Inspection Report 05000373/2024010 and 05000374/2024010 ML23278A1292023-12-14014 December 2023 Units 1 & 2; Limerick, Units 1 & 2; Nine Mile Point, Units 1 & 2; and Peach Bottom, Units 2 & 3 -Revision to Approved Alternatives to Use Boiling Water Reactor Vessel and Internals Project Guidelines ML23305A1402023-12-13013 December 2023 Units 1 & 2; Nine Mile Point, Unit 2; Peach Bottom, Units 2 & 3; and Quad Cities, Units 1 and 2 - Issuance of Amendments to Adopt Traveler TSTF-580 ML23317A1192023-11-10010 November 2023 Constellation Energy Generation, LLC - 2023 Annual Report - Guarantees of Payment of Deferred Premiums RS-23-120, Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information2023-11-10010 November 2023 Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information IR 05000373/20230032023-11-0909 November 2023 County Station Integrated Inspection Report 05000373/2023003, 05000374/2023003, and 07200070/2023001 ML23286A2602023-11-0808 November 2023 Issuance of Amendment Nos. 260 and 245 to Renewed Facility Operating Licenses Relocation of Pressure and Temperature Limit Curves to the Pressure Temperature Report IR 05000373/20234012023-11-0707 November 2023 County Station Security Baseline Inspection Report 05000373/2023401 and 05000374/2023401 RS-23-103, Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation2023-10-13013 October 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation RS-23-097, Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans2023-10-12012 October 2023 Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans IR 05000374/20230102023-10-11011 October 2023 NRC Inspection Report 05000374/2023010 IR 05000373/20233012023-09-15015 September 2023 Errata to NRC Initial License Examination Report 05000373/2023301; 05000374/2023301 RS-23-080, Constellation Energy Generation, LLC, Application to Revise Technical Specifications to Adopt TSTF-264-A, Revision 0, 3.3.9 and 3.3.10 - Delete Flux Monitors Specific Overlap Requirement SRs2023-08-30030 August 2023 Constellation Energy Generation, LLC, Application to Revise Technical Specifications to Adopt TSTF-264-A, Revision 0, 3.3.9 and 3.3.10 - Delete Flux Monitors Specific Overlap Requirement SRs RS-23-087, Revision to Approved Alternatives Associated with the Use of the BWRVIP Guidelines in Lieu of Specific ASME Code Requirements on Reactor2023-08-0404 August 2023 Revision to Approved Alternatives Associated with the Use of the BWRVIP Guidelines in Lieu of Specific ASME Code Requirements on Reactor ML23212A9012023-08-0303 August 2023 Regulatory Audit Report to Support the Review of the Amendments to Relocation of the Pressure Temperature Limit Curves to the Pressure and Temperature Limits Report IR 05000373/20230022023-08-0101 August 2023 County Station - Integrated Inspection Report 05000373/2023002 and 05000374/2023002 ML23208A3182023-07-27027 July 2023 Notification of an NRC Biennial Licensed Operator Requalification Program Inspection and RFI RS-23-084, Response to Request for Additional Information Regarding the Application to Revise Design Basis to Allow Use of Plastic Section Properties in Lower Downcomer Braces Analysis2023-07-24024 July 2023 Response to Request for Additional Information Regarding the Application to Revise Design Basis to Allow Use of Plastic Section Properties in Lower Downcomer Braces Analysis ML23192A5272023-07-12012 July 2023 NRC Initial License Examination Report 05000373/2023301; 05000374/2023301 ML23186A2062023-07-0606 July 2023 Information Request for a NRC Post-Approval Site Inspection for License Renewal 05000374/2023010 ML23181A1502023-06-30030 June 2023 Combined Response to Request for Additional Information and Supplemental Information in Support of LAR to Relocate Pressure and Temperature Limit Curves to the Pressure and Temperature Limits Report ML23178A2422023-06-28028 June 2023 Reassignment of the U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch III IR 05000373/20230112023-06-26026 June 2023 County Station - Quadrennial Fire Protection Team Inspection Report 05000373/2023011 and 05000374/2023011 RS-23-077, Response to NRC Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations2023-06-16016 June 2023 Response to NRC Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations ML23167A0352023-06-16016 June 2023 Registration of Use of Cask to Store Spent Fuel ML23171A9562023-06-12012 June 2023 Post Exam Ltr RS-23-042, Application to Revise Technical Specifications to Adopt TSTF-580, Provide Exception from Entering Mode 4 with No Operable RHR Shutdown Cooling2023-05-25025 May 2023 Application to Revise Technical Specifications to Adopt TSTF-580, Provide Exception from Entering Mode 4 with No Operable RHR Shutdown Cooling IR 05000373/20230012023-05-10010 May 2023 County Station - Integrated Inspection Report 05000373/2023001 and 05000374/2023001 ML23123A2202023-05-0303 May 2023 Relief Request I4R-14 for Alternative Frequency to Containment Unbonded Post-Tensioning System Inservice Inspection ML23118A3472023-05-0101 May 2023 County, 1 & 2; Nine Mile Point, 2; and Quad Cities, 1 & 2 - Correction of Amendment No. 193 Adoption of TSTF-306, Revision 2, Add Action to LCO 3.3.6.1 to Give Option to Isolate the Penetration EPID L-2022-LLA-0143 ML23121A1612023-05-0101 May 2023 Information Meeting (Open House) with a Question-and-Answer Session to Discuss NRC 2022 End-of-Cycle Plant Performance Assessment of LaSalle County Station, Units 1 and 2 ML23114A2522023-04-28028 April 2023 Request to Use a Provision of a Later Edition of the ASME Boiler & Pressure Vessel Code, Section XI ML23081A0382023-04-25025 April 2023 County, 1 & 2; Nine Mile Point, 2; and Quad Cities, 1 & 2 - Issuance of Amendments to Adopt TSTF-306, Rev. 2, Add Action to LCO 3.3.6.1 to Give Option to Isolate the Penetration ML23110A3202023-04-21021 April 2023 Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes Inspection ML23107A1822023-04-18018 April 2023 Operator Licensing Examination Approval Lasalle County Station, May 2023 RS-23-049, Constellation Energy Generation, LLC, Report on Status of Decommissioning Funding for Reactors and Independent Spent Fuel Storage Installations2023-03-23023 March 2023 Constellation Energy Generation, LLC, Report on Status of Decommissioning Funding for Reactors and Independent Spent Fuel Storage Installations ML23073A2182023-03-22022 March 2023 Issuance of Amendment No. 258 to Renewed Facility Operating Licenses Exigent Amendment to Revise Design Basis Related to Seismic Requirements RS-23-048, Exigent Amendment Request to Revise Design Basis Related to Seismic Requirements2023-03-0707 March 2023 Exigent Amendment Request to Revise Design Basis Related to Seismic Requirements ML23061A1632023-03-0303 March 2023 Reassignment of the U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch 3 IR 05000373/20220062023-03-0101 March 2023 Annual Assessment Letter for LaSalle County Station, Units 1 and 2 (Report 05000373/2022006 and 05000374/2022006) RS-23-045, Constellation Energy Generation, LLC Submittal of Fitness for Duty Performance Data Reports for 2022 Per 10 CFR 26.717(c) & 10 CFR 26.2032023-02-28028 February 2023 Constellation Energy Generation, LLC Submittal of Fitness for Duty Performance Data Reports for 2022 Per 10 CFR 26.717(c) & 10 CFR 26.203 RS-23-037, Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors for LaSalle County Station2023-02-22022 February 2023 Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors for LaSalle County Station ML23024A1372023-02-0303 February 2023 Request for Withholding Information from Public Disclosure for LaSalle County Station, Unit Nos. 1 and 2 ML23031A1972023-01-31031 January 2023 Notification of NRC Fire Protection Team Inspection Request for Information, Inspection Report Nos. 05000373/2023011 and 05000374/2023011 IR 05000373/20220042023-01-31031 January 2023 County Station - Integrated Inspection Report 05000373/2022004 and 05000374/2022004 RS-23-003, Constellation Energy Generation, LLC, Summary of Changes to Quality Assurance Topical Report, NO-AA-10, and Decommissioning Quality Assurance Program, NO-DC-102023-01-31031 January 2023 Constellation Energy Generation, LLC, Summary of Changes to Quality Assurance Topical Report, NO-AA-10, and Decommissioning Quality Assurance Program, NO-DC-10 2024-01-05
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 January 24, 2011 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
LASALLE COUNTY STATION, UNITS 1 AND 2 - PROPOSED LICENSE CONDITIONS RELATED TO USE OF NEUTRON ABSORBERS (TAC NOS. ME2376 AND ME2377)
Dear Mr. Pacilio:
By letter dated October 5,2009, supplemented by letters dated June 10, November 23, December 14, December 22, 2010, and January 11, 2011 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML092810279, ML101650229, ML103270566, ML103490098, ML103570025, and ML110130074, respectively) Exelon Generation Company, LLC (EGC, Exelon, or the licensee), requested changes to the Technical Specifications for LaSalle County Station (LSCS),
Units 1 and 2 spent fuel pool (SFP) storage requirements. The request is required to accommodate degradation in the installed neutron absorber in the LSCS Unit 2 SFP.
For LSCS Unit 2 SFP rack modules that do not contain the NETCO-SNAP-IN inserts, the licensee continues to rely on BORAFLEX to control reactivity. A large number of BORAFLEX panels have degraded below the 0.020 gram per centimeter-square Boron-10 (gm/cm 2 B10 )
areal density modeled in the analysis of record. The information provided at this point regarding EGC's actions is not sufficient to allow the Nuclear Regulatory Commission (NRC) to reach a final licensing decision. As a result, the NRC staff has determined that several license conditions (LC) will be necessary to address the crediting o'f boron in the LSCS Unit 2 SFPs.
The NRC staff proposed the following as LC 2.(C):
(30) Beginning 120 days after the LSCS Unit 2 refueling outage 13 (L2R13) and until October 28, 2011, the storage cells in the rack models without NETCO-SNAP-IN inserts will be placed into one of three categories: Unrestricted, Restricted, and Unusable.
- a. Unrestricted will be cells whose minimum panel B10 areal density is greater than or equal to 0.0167 gm/cm 2 . Unrestricted cells may contain fuel assemblies up to the maximum reactivity identified in TS 4.3.1.1.d.
- b. Restricted will be cells whose minimum panel B10 areal density is between 0.0167 gm/cm 2 and 0.0115 gm/cm 2 . Restricted cells will only contain LSCS Units 1 and 2 Cycle 1 General Electric (GE) and GE14 fuel assemblies.
- c. Unusable will be cells whose minimum panel B10 areal density is less than or equal to 0.0115 gm/cm 2 . Unusable cells will be administratively controlled to remain empty of any fuel assembly.
M. Pacilio -2 (31) After October 28, 2011, until all NETCO-SNAP-IN inserts have been fully loaded into the LSCS Unit 2 SFP, the following categories will apply: Unrestricted, Restricted, and Unusable.
- a. Unrestricted will be cells whose minimum panel B10 areal density is greater than or equal to 0.0200 gm/cm 2 . Unrestricted cells may contain fuel assemblies up to the maximum reactivity identified in TS 4.3.1.1.d.
- b. Restricted will be cells whose minimum panel B10 areal density is between 0.0200 gm/cm 2 and 0.0167 gm/cm 2 . Restricted cells will only contain LSCS Units 1 and 2 Cycle 1 GE and GE14 fuel assemblies.
- c. Unusable will be cells whose minimum panel B10 areal density is less than or equal to 0.0167 gm/cm 2 . Unusable cells will be administratively controlled to remain empty of any fuel assembly.
(32) Exelon shall complete loading all accessible storage rack cells in the LSCS Unit 2 spent fuel pool with NETCO-SNAP-IN inserts no later than December 31,2014.
These proposed LCs were discussed with Patrick Simpson and Ken Nicely of your staff on January 13, 2011. In order to support the issuance of the safety evaluation in a timely fashion, Exelon should provide a response to the proposed license conditions indicating Exelon's understanding and acceptance of these conditions. It should be noted, however, that the acceptance does not constitute completion of the NRC staff's review regarding crediting of BORAFLEX until the NETCO-SNAP-IN inserts can be fully loaded into the SFP.
Sincerely, IRA!
Eva A. Brown, Senior Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-373 and 50-374 cc: Distribution via Listserv
M. Pacilio -2 (31) After October 28, 2011, until all NETCO-SNAP-IN inserts have been fUlly loaded into the LSCS Unit 2 SFP, the following categories will apply: Unrestricted, Restricted, and Unusable.
- a. Unrestricted will be cells whose minimum panel B'o areal density is greater than or equal to 0.0200 gm/cm 2 . Unrestricted cells may contain fuel assemblies up to the maximum reactivity identified in TS 4.3.1.1.d.
- b. Restricted will be cells whose minimum panel B'o areal density is between 0.0200 gm/cm 2 and 0.0167 gm/cm 2 . Restricted cells will only contain LSCS Units 1 and 2 Cycle 1 GE and GE14 fuel assemblies.
- c. Unusable will be cells whose minimum panel B'o areal density is less than or equal to 0.0167 gm/cm 2 . Unusable cells will be administratively controlled to remain empty of any fuel assembly.
(32) Exelon shall complete loading all accessible storage rack cells in the LSCS Unit 2 spent fuel pool with NETCO-SNAP-IN inserts no later than December 31,2014.
These proposed LCs were discussed with Patrick Simpson and Ken Nicely of your staff on January 13, 2011. In order to support the issuance of the safety evaluation in a timely fashion, Exelon should provide a response to the proposed license conditions indicating Exelon's understanding and acceptance of these conditions. It should be noted, however, that the acceptance does not constitute completion of the NRC staff's review regarding crediting of BORAFLEX until the NETCO-SNAP-IN inserts can be fully loaded into the SFP.
Sincerely, IRA!
Eva A. Brown, Senior Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-373 and 50-374 cc: Distribution via Listserv DISTRIBUTION:
PUBLIC LPL3-2 R/F RidsNrrDorlLpl3-2 Resource RidsNrrDssSrxb RidsNrrPMLaSalie Resource RidsNrrLATHarris Resource RGrover, NRR KWood, NRR RidsOgcRp Resource RidsNrrDorlDpr Resource MYoder,NRR EWong, NRR RidsNrrDirsltsb Resource RidsAcrsAcnw_MailCTR Resource APulvirenti, RES RidsRgn3MailCenter Resource RidsNrrDciCsgb ADAMS ACCESSION NO MI-110180331 OFFICE LPL3-2/PM LPL3-2/LA LPL3-2/BC OGC 1 NLO DORUDD MSmith AHowe NAME EBrown THarris RCarlson (NDiFrancesco for)
DATE 01/24/11 01/20/11 01/21/11 01/24/11 01/24/11 OFFICIAL RECORD COPY