Letter Sequence RAI |
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EPID:L-2021-LLA-0177, License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications (Approved, Closed) |
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MONTHYEARML21272A1682021-09-28028 September 2021 License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications Project stage: Request ML21271A6112021-09-28028 September 2021 Presentation Information for Second Pre-Application Meeting Regarding Use of Framatome Fuel at Callaway Plant Project stage: Meeting ML21272A1672021-09-28028 September 2021 License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications Project stage: Request ML21308A0692021-11-0404 November 2021 NRR E-mail Capture - LIC-109 Acceptance Review (Unacceptable for Review with Opportunity to Supplement) - Callaway Unit 1 - License Amendment Request - Adoption of Alternate Source Term and Revision of TSs - Project stage: Acceptance Review ML21319A0062021-11-30030 November 2021 Supplemental Information Needed for Acceptance of Requested Licensing Actions License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications Project stage: Acceptance Review ML21335A4512021-12-0101 December 2021 Supplement to License Amendment Request for Adoption of Alternative Source Term and Revision of Technical Specifications Project stage: Request ML21335A1602021-12-0101 December 2021 Special Report 2021-02: Accident Monitoring Instrumentation Non-Functional for Greater than 7 Days Project stage: Request ML21335A4522021-12-0101 December 2021 Supplement to License Amendment Request for Adoption of Alternative Source Term and Revision of Technical Specifications Project stage: Supplement ML21342A3332021-12-10010 December 2021 Acceptance of Requested Licensing Actions License Amendment for Adoption of Alternate Source Term and Revision of Technical Specifications Project stage: Acceptance Review ML22137A0292022-05-16016 May 2022 NRR E-mail Capture - Draft - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 Project stage: Draft RAI ML22154A0122022-06-0202 June 2022 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 Project stage: RAI ML22186A1052022-07-0505 July 2022 Response to Request for Additional Information Regarding Licensee Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications Project stage: Response to RAI ML22186A1032022-07-0505 July 2022 Response to Request for Additional Information Regarding Licensee Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications Project stage: Request ULNRC-06754, Response to Request for Additional Information Regarding Licensee Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications2022-07-0505 July 2022 Response to Request for Additional Information Regarding Licensee Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications Project stage: Response to RAI ML22244A1672022-09-0101 September 2022 Revised Response to Request for Additional Information Regarding License Amendment Request for Adoption Off Alternate Source Term and Revision of Technical Specifications (LDCN 2 1-00 15) Project stage: Request ML22287A0952022-10-14014 October 2022 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 Project stage: RAI ML22342B2642022-12-0808 December 2022 Response to Request for Additional Information Regarding License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications (LDCN 21-0015) Project stage: Request ML23037A0022023-02-0303 February 2023 NRR E-mail Capture - Callaway - LAR to Adopt AST - EPID L-2021-LLA-0177 - Revised Schedule for Completion of the Project Project stage: Approval ML23166B0882023-09-20020 September 2023 Issuance of Amendment No. 233 for Adoption of Alternative Source Term and Revision of Technical Specifications Project stage: Approval 2022-12-08
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Category:E-Mail
MONTHYEARML23362A0572023-12-28028 December 2023 NRR E-mail Capture - Callaway Plant, Unit 1 - SUNSI Review of the Final Safety Analysis Report (FSAR) Revision OL-26 ML23338A0392023-12-0101 December 2023 NRR E-mail Capture - LIC-109 Acceptance Review - Unacceptable with Opportunity to Supplement - Callaway - RR from Requirements of ASME BPV Code, Section Xl, Subsect IWL-Exam & Test-Unbonded Post Tensioning System - EPID L-2023-LLR-0061 ML23208A1052023-07-27027 July 2023 NRR E-mail Capture - Callaway Plant, Unit No. 1 - Regulatory Audit Questions - LAR to Clarify Support System Requirements for the Residual Heat Removal & Control Room Air Conditioning Systems ML23200A2982023-07-19019 July 2023 NRR E-mail Capture - Callaway Plant, Unit 1 - Final Request for Additional Information (RAI) - Request for Approval of Oqam, Revision 36a - EPID L-2023-LLQ-0000 ML23121A0112023-04-28028 April 2023 NRR E-mail Capture - Callaway Plant, Unit 1 - LIC-109 Acceptance of License Amendment Request to Revise TS to Adopt TSTF-501-A Revision 1, Relocate Stored Fuel Oil and Lube Oil Volume Values to Licensee Control - EPID L-2023-LLA-0046 ML23114A2302023-04-24024 April 2023 NRR E-mail Capture - Regulatory Audit Question - Callaway LAR and Exemption for Fuel Transition to Framatome Gaia Fuel - EPIDs - L-2022-LLA-0150 and L-2022-LLE-0030 ML23107A1812023-04-17017 April 2023 NRR E-mail Capture - Regulatory Audit Questions - Callaway LAR and Exemption for Fuel Transition to Framatome Gaia Fuel - EPIDs - L-2022-LLA-0150 and L-2022-LLE-0030 ML23096A0072023-04-0505 April 2023 NRR E-mail Capture - Final Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request to Revise TS 5.5.16 for Permanent Extension of Integrated Leak Rate Testing - EPID L-2022-LLA-0165 ML23073A0262023-03-13013 March 2023 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - SG Inspection Report Review - EPID L-2022-LRO-0143 ML23037A7092023-02-0606 February 2023 April 2023 Emergency Preparedness Exercise Inspection - Request for Information ML23037A0022023-02-0303 February 2023 NRR E-mail Capture - Callaway - LAR to Adopt AST - EPID L-2021-LLA-0177 - Revised Schedule for Completion of the Project ML23026A0212023-01-24024 January 2023 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - LAR for Proposed Changes to TS for SFP - ML23010A2902023-01-10010 January 2023 NRR E-mail Capture - LIC-109 Acceptance Review - Callaway Plant, Unit 1 - License Amendment Request to Clarify Support System Requirements for the RHR & Crac Systems - ML22346A0132022-12-0909 December 2022 NRR E-mail Capture - Callaway Plant, Unit 1 - LIC-109 Acceptance of LAR to Revise TS 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Test Frequencies - EPID L-2022-LLA-0165 ML22322A0062022-11-17017 November 2022 NRR E-mail Capture - Final - LIC-109 Acceptance Review (Unacceptable for Review with Opportunity to Supplement) Callaway - LAR for Proposed Changes to TS and Exemption Request Use of Framatome Gaia Fuel - L-2022-LLA-0150 & L-2022-LLE-0030 ML22287A0952022-10-14014 October 2022 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 ML22280A1322022-10-0707 October 2022 NRR E-mail Capture - Final - LIC-109 Acceptance Review (Unacceptable for Review with Opportunity to Supplement) - Callaway - License Amendment Request for Proposed Changes to Tech Spec Changes for Spent Fuel Pool Storage - EPID L-2022-LLA-0 ML22278A0122022-10-0404 October 2022 NRR E-mail Capture - Draft - LIC-109 Acceptance Review (Unacceptable for Review with Opportunity to Supplement) - Callaway License Amendment Request for Proposed Changes to Tech Spec Changes for Spent Fuel Pool Storage - EPID L-2022-LLA-013 ML22269A4312022-09-26026 September 2022 November 2022 Emergency Preparedness Program Inspection - Request for Information NRC-2100-2022, EN 55999 Valcor Coil Shell Assemblies Final Notification (004)2022-09-12012 September 2022 EN 55999 Valcor Coil Shell Assemblies Final Notification (004) ML22251A0122022-09-0707 September 2022 NRR E-mail Capture - Callaway Plant, Unit 1 - LIC-109 Acceptance of License Amendment Request for Application to Revise TS to Adopt TSTF-577, Revised Frequencies for Steam Generator Tube Inspections - EPID L-2022-LLA-0110 NRC 2110-2022, EN 55999 - Valcor Engineering Corporation (009)2022-07-18018 July 2022 EN 55999 - Valcor Engineering Corporation (009) ML22216A0072022-07-0808 July 2022 NRR E-mail Capture - Callaway Plant, Unit No. 1 - Draft Acceptance Review (Unacceptable for Review with Opportunity to Supplement) for Framatome Fuel Transition LAR and Exemption - EPIDs L-2022-LLA-0083 and L-2022-LLE-0019) ML22167A0252022-06-15015 June 2022 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - LAR for Proposed Revision to Radiological Emergency Response Plan Regarding Response & Notification Goals - EPID L-2022-LLA-0024 ML22157A0102022-06-0303 June 2022 NRR E-mail Capture - NRC Acceptance Review of Braidwood Ultimate Heat Sink Temporary Temperature Increase to 102.8 Degrees Fahrenheit ML22154A0122022-06-0202 June 2022 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 ML22151A0512022-05-27027 May 2022 NRR E-mail Capture - Final - Request for Additional Information - Columbia Generating Station - LAR to Change TS 3.4.11 - Reactor Coolant System Pressure and Temperature Limits - EPID L-2021-LLA-0191 ML22137A0292022-05-16016 May 2022 NRR E-mail Capture - Draft - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 ML22096A0232022-04-0505 April 2022 NRR E-mail Capture - Callaway Plant - Final RAIs - License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address Generic Safety Issue - 191 and Respond to GL 2004-02 (EPIDs L-2021-LLA-0059 and L-2021-LLE-0021) ML22089A0222022-03-29029 March 2022 NRR E-mail Capture - Callaway Plant, Unit 1 - LAR to Adopt TSTF-505 and TSTF-439 - Follow Up Clarifications for the Audit Questions - EPID L-2021-LLA-0197 ML22087A4022022-03-28028 March 2022 NRR E-mail Capture - Callaway - Draft RAIs - License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address Generic Safety Issue - 191 and Respond to Generic Letter 2004-02 (EPIDs L-2021-LLA-0059 and L-2021-LLE-0021) ML22070A1362022-03-10010 March 2022 NRR E-mail Capture - Callaway Plant, Unit 1 - LIC-109 Acceptance of License Amendment Request for Proposed Revision to Radiological Emergency Response Plan Regarding Response and Notification Goals - EPID L-2022-LLA-0024 ML22047A2312022-02-11011 February 2022 Email Between NRC NSIR and FEMA Regarding Callaway Sirens 021122 ML22003A0852022-01-0303 January 2022 NRR E-mail Capture - Callaway Plant, Unit 1 - LIC-109 Acceptance of License Amendment Request to Adopt TSTF-529, Clarify Use and Application Rules - EPID L-2021-LLA-0225 ML21334A5172021-11-30030 November 2021 NRR E-mail Capture - Callaway Plant, Unit 1 - LIC-109 Acceptance of Requested Licensing Action - Application to Adopt TSTF-439 and TSTF-505 - EPID L-2021-LLA-0197 ML21335A0172021-11-30030 November 2021 NRR E-mail Capture - Callaway Plant, Unit 1 - LIC-109 Acceptance of Requested Licensing Action - Application to Adopt TSTF-439 and TSTF-505 - EPID L-2021-LLA-0197 ML21308A0692021-11-0404 November 2021 NRR E-mail Capture - LIC-109 Acceptance Review (Unacceptable for Review with Opportunity to Supplement) - Callaway Unit 1 - License Amendment Request - Adoption of Alternate Source Term and Revision of TSs - ML21258A0382021-09-14014 September 2021 NRR E-mail Capture - Final - Request for Additional Information - Callaway, Unit 1 - LAR to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures, Systems and Components for Nuclear Power Reactors- EPID L-2020-LLA-023 ML21195A0252021-07-13013 July 2021 Email 7-13-21 Request for Information - Callaway EP Exercise Inspection - Sept 2021 ML21125A0452021-05-0404 May 2021 NRR E-mail Capture - LIC-109 Acceptance Review (Unacceptable for Review with Opportunity to Supplement) - Callaway Plant, Unit 1 - License Amendment Request - Final Resolution to Address Concerns of GSI-191 - EPID L-2021-LLA-0059 ML21007A1622021-01-0606 January 2021 NRR E-mail Capture - Final - Request for Additional Information - (COVID-19) Callaway Plant, Unit 1 - Additional Request for Exemption from Specific Requirements of 10 CFR Part 26, Fitness for Duty Programs - EPID L-2021-LLE-0242 ML20342A1802020-12-0606 December 2020 NRR E-mail Capture - Callaway - LIC-109 Acceptance Requested Licensing Action - Application to Adopt 10 CFR 50.69, Risk-Informed Categorization & Treatment of Structures, Systems & Components for Nuclear Power Reactors EPID L-2020-LLA-0235 ML20296A6332020-10-22022 October 2020 NRR E-mail Capture - Callaway Plant, Unit 1 - Exemption from Certain Requirements of 10 CFR Part 73, Appendix B, General Criteria for Security Personnel, Section VI (EPID L 2020 Lle 0140 (Covid 19)) - Revised Completion Schedule ML20205L4252020-07-22022 July 2020 NRR E-mail Capture - Callaway Plant, Unit 1 - Acceptance of Requested Licensing Action Request for One-Time License Amendment to Defer Upcoming Steam Generator Inspection (EPID L-2020-LLA-0142)(COVID-19) ML20203M3682020-07-21021 July 2020 NRR E-mail Capture - Draft Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request - Revision to Technical Specification (TS) 5.3.1 and Deletion of TS 5.3.1.1 and 5.3.1.2 - EPID L-2020-LLA-0046 ML20162A1882020-06-10010 June 2020 Request for Supporting Information for the Callaway SPRA Audit Review - Draft Supplement ML20153A7902020-05-29029 May 2020 Emai: RFI for Callaway EP Program Inspection ML20133K6742020-05-11011 May 2020 05000483, Request for Information 2020-002 ML20099G2422020-04-0808 April 2020 NRR E-mail Capture - Acceptance Callaway Containment Tendon COVID-19 Relief Request ML20097C8362020-04-0606 April 2020 NRR E-mail Capture - Accepted: Callaway TS Change 5.3.1 LAR EPID: L-2020-LLA-0046 2023-07-27
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML23200A2982023-07-19019 July 2023 NRR E-mail Capture - Callaway Plant, Unit 1 - Final Request for Additional Information (RAI) - Request for Approval of Oqam, Revision 36a - EPID L-2023-LLQ-0000 ML23174A1272023-06-23023 June 2023 Cw FFD Document Request List 2023 ML23158A1462023-06-13013 June 2023 Notification of Post-Approval Site Inspection for License Renewal and Request for Information Inspection (05000483/2023010) ML23163A1572023-06-0606 June 2023 In-service Inspection Request for Information ML23096A0072023-04-0505 April 2023 NRR E-mail Capture - Final Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request to Revise TS 5.5.16 for Permanent Extension of Integrated Leak Rate Testing - EPID L-2022-LLA-0165 ML23080A1382023-03-21021 March 2023 Notification of Inspection (NRC Inspection Report 05000483/2023003) and Request for Information ML23073A0262023-03-13013 March 2023 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - SG Inspection Report Review - EPID L-2022-LRO-0143 ML23037A7092023-02-0606 February 2023 April 2023 Emergency Preparedness Exercise Inspection - Request for Information ML23026A0212023-01-24024 January 2023 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - LAR for Proposed Changes to TS for SFP - ML22287A0952022-10-14014 October 2022 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 ML22269A4312022-09-26026 September 2022 November 2022 Emergency Preparedness Program Inspection - Request for Information ML22173A0562022-06-22022 June 2022 Information Request, Security IR 2022402 ML22167A0252022-06-15015 June 2022 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - LAR for Proposed Revision to Radiological Emergency Response Plan Regarding Response & Notification Goals - EPID L-2022-LLA-0024 ML22157A0572022-06-0606 June 2022 Notification of NRC Design Bases Assurance Inspection (Programs) (05000483/2022013) and Request for Information ML22154A0122022-06-0202 June 2022 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 ML22151A0512022-05-27027 May 2022 NRR E-mail Capture - Final - Request for Additional Information - Columbia Generating Station - LAR to Change TS 3.4.11 - Reactor Coolant System Pressure and Temperature Limits - EPID L-2021-LLA-0191 ML22137A0292022-05-16016 May 2022 NRR E-mail Capture - Draft - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 ML22096A0232022-04-0505 April 2022 NRR E-mail Capture - Callaway Plant - Final RAIs - License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address Generic Safety Issue - 191 and Respond to GL 2004-02 (EPIDs L-2021-LLA-0059 and L-2021-LLE-0021) ML21336A6392021-12-0202 December 2021 .05 Sec Doc Request ML21319A0062021-11-30030 November 2021 Supplemental Information Needed for Acceptance of Requested Licensing Actions License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications ML21258A0382021-09-14014 September 2021 NRR E-mail Capture - Final - Request for Additional Information - Callaway, Unit 1 - LAR to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures, Systems and Components for Nuclear Power Reactors- EPID L-2020-LLA-023 ML21159A2352021-06-17017 June 2021 Notification of NRC Triennial Heat Exchanger/Heat Sink Performance Inspection (05000483/2021003) and Request for Information ML21130A5882021-05-11011 May 2021 Supplemental Information Needed for Acceptance of Requested Licensing Actions to Adopt a Risk-Informed Approach to Address GSI-191 and Respond to Generic Letter 2004 02 ML21088A3872021-03-30030 March 2021 Notification of Evaluations of Changes, Tests, and Experiments Inspection (Inspection Report 05000483/2021002) and Request for Information ML21007A1622021-01-0606 January 2021 NRR E-mail Capture - Final - Request for Additional Information - (COVID-19) Callaway Plant, Unit 1 - Additional Request for Exemption from Specific Requirements of 10 CFR Part 26, Fitness for Duty Programs - EPID L-2021-LLE-0242 ML20203M3682020-07-21021 July 2020 NRR E-mail Capture - Draft Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request - Revision to Technical Specification (TS) 5.3.1 and Deletion of TS 5.3.1.1 and 5.3.1.2 - EPID L-2020-LLA-0046 ML20162A1882020-06-10010 June 2020 Request for Supporting Information for the Callaway SPRA Audit Review - Draft Supplement ML20280A5442020-03-25025 March 2020 Cwy 2020 PIR Request for Information ML20064B6582020-02-27027 February 2020 Second, Third, and Fourth Request for Information for Callaway Dba Teams Inspection 2020011 ML19317E6332019-11-13013 November 2019 Request for Supporting Information for the Callaway SPRA Audit Review ML19107A5152019-04-11011 April 2019 Cwy 2019410 RFI Cyber Security Gap ML19078A2932019-03-18018 March 2019 Notification of an NRC Triennial Fire Protection Baseline Inspection (NRC Inspection Report 05000483/2019010) and Request for Information ML19023A2032019-01-22022 January 2019 Notification of NRC Triennial Heat Sink Performance Inspection (05000483/2019001) and Request for Information ML19009A3442019-01-0909 January 2019 NRR E-mail Capture - Formal Release of RAIs Ref: Callaway Plant Class 1E LAR, L-2018-LLA-0062 ML18355A4882018-12-20020 December 2018 NRR E-mail Capture - Formal Release of RAI Ref: Callaway Plant EAL Changes, L-2018-LLA-0239 ML18331A2052018-11-27027 November 2018 NRR E-mail Capture - Formal Release of RAIs Ref: Callaway Relief Request EPID L-2018-LLR-0051 ML18025B4672018-01-24024 January 2018 NRR E-mail Capture - Request for Extension of Due Date for RAI Response ML17304B1912017-10-31031 October 2017 NRR E-mail Capture - Requests for Additional Information Concerning Callaway License Amendment - Thermal Overload Protection ML17142A1352017-05-19019 May 2017 Notification of NRC Design Bases Assurance Inspection (05000483/2017007) and Initial Request for Information ML17115A0622017-04-25025 April 2017 NRR E-mail Capture - Requests for Additional Information -- Callaway Plant, Unit 1, Technical Specification 5.6.5, Core Operating Limits Report CAC MF8463 ML17038A2292017-02-0707 February 2017 NRR E-mail Capture - RAI Formal Release for Callaway SG Tube Inspection Report, MF8474 ML16111B3222016-04-20020 April 2016 Notification of Evaluations of Changes, Tests, and Experiments, and Permanent Plant Modifications Inspection (05000483/2016007) and Request for Information ML15316A1532015-11-12012 November 2015 Request for Additional Information Email, Relief Request 13R-11 (Pressurizer Welds) from Code Case N-460 Requirements, Third 10-Year Inservice Inspection Interval ML15096A0942015-04-0606 April 2015 Notification of Inspection (NRC Inspection Report 05000483/2015003) and Request for Information ML14353A1172014-12-22022 December 2014 Request for Additional Information, Round 3, License Amendment Request to Revise Final Safety Analysis Report Standard Plant Section 3.6 for High Density Polyethylene (Hdpe) Crack Exclusion ML14294A7752014-10-28028 October 2014 Request for Additional Information, Round 2, License Amendment Request to Revise Final Safety Analysis Report Standard Plant Section 3.6 for High Density Polyethylene (Hdpe) Crack Exclusion ML14203A0632014-07-25025 July 2014 Request for Additional Information, Relief Request I3R-17, Proposed Alternative to ASME Code, Section XI Requirements, Which Extends Rv ISI Frequency from 10 to 20 Years, Third 10-Year ISI Interval ML14178A8232014-07-0101 July 2014 Request for Additional Information, License Amendment Request to Revise Final Safety Analysis Report- Standard Plant Section 3.6 for High Density Polyethylene (Hdpe) Crack Exclusion ULNRC-06117, Callaway Plant, Unit 1, License Revewal Application, Request for Additional Information (RAI) Set 31 Responses2014-04-24024 April 2014 Callaway Plant, Unit 1, License Revewal Application, Request for Additional Information (RAI) Set 31 Responses ML14114A1102014-04-24024 April 2014 License Revewal Application, Request for Additional Information (RAI) Set 31 Responses 2023-07-19
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From: Mahesh Chawla Sent: Friday, October 14, 2022 12:09 PM To: Elwood, Thomas B Cc: Jennifer Dixon-Herrity; Barbara Hayes; Kevin Quinlan; John Parillo; Kevin Hsueh; Chakrapani Basavaraju; Stewart Bailey; Derek Scully; Brian Wittick; Jack Zhao; Michael Waters; Jason Huang; Jesse Seymour; Brian Green (He/Him); Jorge Cintron-Rivera; Matthew Hamm; Matthew McConnell; Jason Paige; Vic Cusumano; Mike Mazaika; Steve Jones
Subject:
Final - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 Attachments: Callaway - Final_Second_RAI Related to ARCON96-NAI Onsite Dispersion Analysis for LAR to Implement AST.docx
Dear Mr. Elwood,
By letter dated September 28, 2021 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML21272A167), supplemented by letters dated December 1, 2021 (ML21335A451), and July 5, 2022 (ML22186A103), Union Electric Company, dba Ameren Missouri (the licensee) submitted a license amendment request (LAR) for Callaway Plant, Unit No. 1 (Callaway) to the U.S. Nuclear Regulatory Commission (NRC). Pursuant to Title 10 of Code of Federal Regulations (10 CFR) Section 50.90, Application for amendment of license, construction permit, or early site permit, and 10 CFR 50.67, Accident Source Term, the licensee requested, in part, to incorporate the alternate source term (AST) dose analysis methodology into the Callaway licensing basis. In order to complete our review of the onsite dispersion modeling analysis and related accident dose calculations in the application, the NRC staff is requesting additional information (RAI), attached herewith.
The NRC staff conducted a clarification call with you and your representatives on October 4, 2022, to discuss the draft RAI sent to you on September 20, 2022. During this call, you confirmed our observation that incorrect default input values were used in your ARCON96-NAI dispersion modeling calculations. You agreed to re-run all the ARCON96-NAI model runs using the correct default input values for the 720-hour (i.e., 4- to 30-day) averaging period to reconcile any differences between the NRC confirmatory results and your calculations, to revise any affected dose calculations, to update any affected tables and/or figures in your application submittal, and to verify if the incorrect default values for that averaging period were inherent to the ARCON96-NAI code itself or simply an error in preparing the model input files.
You estimated and agreed to provide these results in a supplement on the docket within 60 days upon receipt of this email. The NRC estimates that its review will take another 90 days to evaluate the data and complete this project. However, it is contingent upon no additional dispersion modeling-related changes by you, or any other issues or concerns being raised by the NRC staff. Upon completion of their evaluation, the NRC staff will be able to provide a more accurate assessment with regards to any additional time or hours needed to complete the project. Thanks
Sincerely, Mahesh Chawla, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission ph: 301-415-8371 Docket No. 50-483 OFFICE DORL/LPL4/PM DORL/LPL4/BC JDixon-NAME MChawla Herrity DATE 10/14/22 10/14/22
Hearing Identifier: NRR_DRMA Email Number: 1808 Mail Envelope Properties (SA1PR09MB84155789AA0BD9B43EA49CA2F1249)
Subject:
Final - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications -
EPID L-2021-LLA-0177 Sent Date: 10/14/2022 12:08:57 PM Received Date: 10/14/2022 12:08:58 PM From: Mahesh Chawla Created By: Mahesh.Chawla@nrc.gov Recipients:
"Jennifer Dixon-Herrity" <Jennifer.Dixon-Herrity@nrc.gov>
Tracking Status: None "Barbara Hayes" <Barbara.Hayes@nrc.gov>
Tracking Status: None "Kevin Quinlan" <Kevin.Quinlan@nrc.gov>
Tracking Status: None "John Parillo" <John.Parillo@nrc.gov>
Tracking Status: None "Kevin Hsueh" <Kevin.Hsueh@nrc.gov>
Tracking Status: None "Chakrapani Basavaraju" <Chakrapani.Basavaraju@nrc.gov>
Tracking Status: None "Stewart Bailey" <Stewart.Bailey@nrc.gov>
Tracking Status: None "Derek Scully" <Derek.Scully@nrc.gov>
Tracking Status: None "Brian Wittick" <Brian.Wittick@nrc.gov>
Tracking Status: None "Jack Zhao" <Jack.Zhao@nrc.gov>
Tracking Status: None "Michael Waters" <Michael.Waters@nrc.gov>
Tracking Status: None "Jason Huang" <Jason.Huang@nrc.gov>
Tracking Status: None "Jesse Seymour" <Jesse.Seymour@nrc.gov>
Tracking Status: None "Brian Green (He/Him)" <Brian.Green@nrc.gov>
Tracking Status: None "Jorge Cintron-Rivera" <Jorge.Cintron-Rivera@nrc.gov>
Tracking Status: None "Matthew Hamm" <Matthew.Hamm@nrc.gov>
Tracking Status: None "Matthew McConnell" <Matthew.McConnell@nrc.gov>
Tracking Status: None "Jason Paige" <Jason.Paige@nrc.gov>
Tracking Status: None "Vic Cusumano" <Victor.Cusumano@nrc.gov>
Tracking Status: None "Mike Mazaika" <Michael.Mazaika@nrc.gov>
Tracking Status: None "Steve Jones" <Steve.Jones@nrc.gov>
Tracking Status: None "Elwood, Thomas B" <TElwood@ameren.com>
Tracking Status: None Post Office: SA1PR09MB8415.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 2744 10/14/2022 12:08:58 PM Callaway - Final_Second_RAI Related to ARCON96-NAI Onsite Dispersion Analysis for LAR to Implement AST.docx 43123 Options Priority: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
LAR to Implement Alternative Source Term for Callaway Unit 1 Request for Additional Information Related to Onsite Dispersion Modeling Analysis By letter dated September 28, 2021 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML21272A167), Union Electric Company, dba Ameren Missouri (the licensee) submitted a license amendment request (LAR) for Callaway Plant, Unit No. 1 (Callaway). Pursuant to Title 10 of Code of Federal Regulations (10 CFR) Section 50.90, Application for amendment of license, construction permit, or early site permit, and 10 CFR 50.67, Accident Source Term, the licensee requested, in part, to incorporate the alternative source term (AST) dose analysis methodology into the Callaway licensing basis.
In order to accept the application, the NRC staff determined that supplemental information was needed from the licensee. The request for supplemental information was initially sent by email to the licensee on November 4, 2021 (ML21308A069), followed by a clarification call. The request was formally sent on November 30, 2021 (ML21319A006). The supplemental information was submitted by the licensee on December 1, 2021 (ML21335A452).
The supplemental submittal included, in part, responses to requests for data and information pertaining to the offsite and onsite atmospheric dispersion modeling analyses. During its safety review, the NRC staff determined that additional information and clarifications to some of this supplemental submittal was still needed. Requests for additional information (RAIs) were drafted and initially sent by email to the licensee on May 16, 2022 (ML22137A029), followed by a clarification call. The final RAIs were formally sent by email on June 2, 2022 (ML22154A012).
The licensee provided its responses on July 5, 2022 (ML22186A104).
In order to complete its safety review of the atmospheric dispersion modeling analyses, the NRC staff has further determined the need to resolve a potential software issue with respect to the onsite dispersion modeling (i.e., with the ARCON96-NAI model). This potential issue may only affect a portion of that models results.
REGULATORY BASIS The regulatory basis related to onsite atmospheric dispersion modeling analysis was already established in the previous requests for additional information (ML22154A012) and is not repeated here. For reference, though, the guidance pertaining to onsite dispersion analyses is:
BACKGROUND INFORMATION - ONSITE DISPERSION MODELING ANALYSIS The licensees onsite dispersion modeling analysis was based on the ARCON96-NAI code. This model was used to estimate atmospheric dispersion factors (X/Qs) at the normal and emergency air intakes (and at the midpoint between the two emergency intakes) of the control building, at the air intake (or nearest point on) the technical support center (TSC), and at various analysis points along the path of ingress and egress to the control building.
LAR to Implement Alternative Source Term for Callaway Unit 1 Request for Additional Information Related to Onsite Dispersion Modeling Analysis As stated in the previous RAIs, ARCON96-NAI appears to be essentially the same as the NRC-approved ARCON96 dispersion model. ARCON96 implements RG 1.194 and the users guidance in NUREG/CR-6331. Enclosure 14 to the December 1, 2021, supplemental submittal discusses the differences between ARCON96-NAI and ARCON96.
In its supplemental submittal, the licensee provided 78 ARCON96-NAI input and output files (Enclosures 9, 10, and 11). These model runs are intended to estimate X/Q values at the receptors above due to potential accident releases from the various sources identified in the tables and figures of Enclosure 1 of that submittal. Clarifications to the release points and onsite receptor locations were provided by the licensee in Attachment 1 of its July 5, 2022, responses to the RAI questions of June 2, 2022. At that time, the licensee also withdrew 13 of the originally submitted 78 ARCON96-NAI model runs as extraneous to the LAR submittal. The NRC staffs review focused on the remaining 65 model runs.
Enclosures 9, 10, and 11 of the supplemental submittal also included 32 ARCON96-NAI model runs intended to evaluate various accident release scenarios from the reactor (containment) building vent and the refueling water storage tank (RWST) vent. The licensees July 5, 2022, RAI responses included additional information to better understand the sketch of ingress/egress pathways and analysis (receptor) points that were originally part of Enclosure 1 of the supplemental submittal. None of these 32 model runs were withdrawn.
The NRC staff used the ARCON2 dispersion model for its confirmatory checks of the ARCON96-NAI model runs. ARCON2 is available from the agencys Radiation Protection Computer Code Analysis and Maintenance Program (RAMP) website. This model is essentially the same as the ARCON96 code except that a more user-friendly graphical user interface has been incorporated. In addition to implementing the provisions of RG 1.194 an option to utilize RASCAL dispersion algorithms is also provided. However, for this LAR review, the RG 1.194 and NUREG/CR-6331 provisions were followed. The same ARCON96-formatted meteorological data files provided by the licensee were used for the confirmatory model runs.
A number of potentially questionable results were identified based on these confirmatory checks. The controlling X/Q values for a given accident scenario are input to dose calculations and are directly proportional to the resulting dose. Different X/Qs for all averaging times are not unusual when doing confirmatory checks (e.g., due to round-off, etc.). Results were considered to be acceptable if the ARCON2 X/Q estimates differed from the ARCON96-NAI X/Qs by less than 5 percent. However, ARCON2 X/Q values higher than ARCON96-NAI values by more than 10 percent or by greater than 5 percent but less than 10 percent were identified. All overpredictions occurred for only the longest accident averaging period (i.e., 4 to 30 days or from 96 and 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br />). X/Q values for all shorter averaging intervals were essentially the same between the two models.
ARCON2 X/Qs for several (8) accident source-receptor configurations more than 10 percent higher than ARCON96-NAI X/Qs include:
- RWST vent to all Control Bldg. Emerg. Intakes (i.e., >20 percent higher than clwA96_04, 05, and 06 results, no building wake);
- Fuel Handling Bldg. (FHB) to all Control Bldg. Emerg. Intakes (i.e., >18 percent higher than clwA96_07, 08, and 09 results, no building wake);
LAR to Implement Alternative Source Term for Callaway Unit 1 Request for Additional Information Related to Onsite Dispersion Modeling Analysis
- Containment Bldg. vent to Control Bldg. Normal Intake (i.e., >13 percent higher than clwA96_32 results, with building wake); and
- Maint. Hatch to Control Bldg. Normal Intake (i.e., >15 percent higher than clwA96_56 results, no building wake).
ARCON2 X/Qs for various (16) accident source-receptor configurations more than 5 percent but less than 10 percent higher than ARCON96-NAI X/Qs also include:
- FHB to Control Bldg. Normal Intake (i.e., >7 percent higher than clwA96_10 results, no building wake);
- Maint. Hatch to all Control Bldg. Emerg. Intakes (i.e., >9 percent higher than clwA96_23, 24, and 25 results, no building wake);
- Containment Bldg. (Diffuse) to Midpoint Between Control Bldg. Emerg. Intakes A and B (i.e.,
>6 percent higher than clwA96_34 results, with building wake);
- RWST vent to Control Bldg. Normal Intake (i.e., >6 percent higher than clwA96_39 results, no building wake);
- FHB to TSC Intake (i.e., >6 percent higher than clwA96_42 results, no building wake);
- Main Steam Line to TSC Intake (i.e., >8 percent higher than clwA96_51 results, no building wake);
- Feedwater Line to TSC Intake (i.e., >9 percent higher than clwA96_54 results, no building wake);
- Maint. Hatch to TSC Intake (i.e., >6 percent higher than clwA96_57 results, no building wake);
- Steam Air Jet Ejector Line to TSC Intake (i.e., >5 percent higher than clwA96_60 results, no building wake);
- Condenser to TSC Intake (i.e., >8 percent higher than clwA96_63 results, no building wake);
- Turbine Driven Aux Feedwater Pump to TSC Intake (i.e., >5 percent higher than clwA96_69 results, no building wake);
- Containment Bldg. (Diffuse) to TSC Intake (i.e., >8 percent higher than clwA96_71 results, no building wake);
- Emerg. Hatch to Control Bldg. Normal Intake (i.e., >7 percent higher than clwA96_76 results, no building wake);
- Emerg. Hatch to TSC Intake (i.e., >6 percent higher than clwA96_77 results, no building wake).
Further, there are eight analysis points along the pathways leading to and around the Control Building for evaluating dispersion associated with ingress and egress and used as input, as needed, for dose calculations (i.e., Points 1 thru 7 and an additional analysis point between Points 4 and 5). Each analysis point included model runs assuming two receptor heights - at 0 m (ground-level) and 2 m (nominal breathing height). Two potential accident release scenarios were modeled (i.e., from the Containment Building vent and from the RWST vent). In all cases, credit for additional plume dispersion due to building wake effects was conservatively not considered (i.e., this resulted in relatively higher X/Qs and, therefore, doses).
As above, ARCON2 X/Q estimates differing from the ARCON96-NAI values by less than 5 percent were considered to be acceptable. However, ARCON2 X/Qs higher than ARCON96-NAI values ranging from more than 10 percent to about 20 percent were identified. Also as
LAR to Implement Alternative Source Term for Callaway Unit 1 Request for Additional Information Related to Onsite Dispersion Modeling Analysis before, all overpredictions occurred for only the longest accident averaging period (i.e., 4 to 30 days or from 96 and 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br />) with X/Q values for all shorter averaging intervals essentially the same between the two models. Further, it is noted that these overpredictions occurred for downwind distances less than about 200 m for potential releases from the Containment Building vent and for distances less than about 240 m for potential releases from the RWST vent.
Analysis points farther away had ARCON2 overpredictions of less than 5 percent.
The ARCON2 overpredictions of note (a total of 12) compared to ARCON96-NAI results at certain ingress/egress points include:
- RWST vent to Point 5 at 238.4 m downwind (i.e., >14 percent higher than rwst_mp5 and rwst_mp5_0height results, no building wake);
- RWST vent to Point 6 at 148.0 m downwind (i.e., >19 percent higher than rwst_mp6 and rwst_mp6_0height results, no building wake);
- RWST vent to Point 7 at 137.8 m downwind (i.e., >18 percent higher than rwst_mp7 and rwst_mp7_0height results, no building wake).
- Containment Bldg. vent to Point 5 at 197.4 m downwind (i.e., >11 percent higher than vent_mp5 and vent_mp5_0height results, no building wake);
- Containment Bldg. vent to Point 6 at 119.5 m downwind (i.e., > about 12 percent higher than vent_mp6 and vent_mp6_0height results, no building wake);
- Containment Bldg. vent to Point 7 at 98.2 m downwind (i.e., >12 percent higher than vent_mp7 and vent_mp7_0height results, no building wake).
The NRC staff noted a difference in what may be a relevant portion of the output files and discrepancies produced between the ARCON2 and ARCON96-NAI models. Selected from the entire set of paired model runs, a portion of the respective output files that correspond to the highest ARCON2 overprediction (i.e., 22.37 percent) is reproduced below. Notice that in this example the total counts of hours in the two rows labeled In Range and Total X/Qs are numerically the same for all averaging periods, regardless of the model used, except for the 720-hour interval (i.e., the averaging period in question). For that time period, the counts differ between the two codes (i.e., 34417 for the ARCON2 run and 20411 for the ARCON96-NAI run).
Notice too that while the data counts for these two rows are identical in the ARCON2 and ARCON96-NAI outputs, except as noted, the total counts per averaging interval in the row labeled In Range generally vary from model run to model run. This is assumed to simply be a function of differing source-receptor orientations. Nevertheless, spot checks of other model run pairs indicate agreement in the counts for all averaging intervals other than 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> between the outputs from the two codes.
The spot checks also show that the counts in the row labeled Total X/Qs do not vary between the two models (again, except for the 720-hour averaging interval) regardless of the model run.
This appears to simply be a function of the number of hours of valid meteorological input data.
The licensee stated under Section 3.1.1 in Enclosure 1 of its December 1, 2021, supplemental submittal that the ARCON96 analyses (Section 3.1.3) reported a total number of 35,064 hours7.407407e-4 days <br />0.0178 hours <br />1.058201e-4 weeks <br />2.4352e-5 months <br /> of data processed with only 79 hours9.143519e-4 days <br />0.0219 hours <br />1.306217e-4 weeks <br />3.00595e-5 months <br /> of missing data and that the recovery rate for all four years [i.e., 2013 to 2016] is 99.8%.
LAR to Implement Alternative Source Term for Callaway Unit 1 Request for Additional Information Related to Onsite Dispersion Modeling Analysis As a result, the data count for the 720-hour interval as indicated above for the ARCON96-NAI model run (which is the same for all of the licensees model runs) and the X/Q discrepancies between the two models are suspect without further clarification and/or justification for their use.
Data extracted from the ARCON2 confirmatory model run designated as clwA96_04chk:
DISTRIBUTION
SUMMARY
DATA BY AVERAGING INTERVAL AVER. PER. 1 2 4 8 12 24 96 168 360 720 UPPER LIM. 1.00E-02 1.00E-02 1.00E-02 1.00E-02 1.00E-03 1.00E-03 1.00E-03 1.00E-03 1.00E-03 1.00E-03 LOW LIM. 1.00E-06 1.00E-06 1.00E-06 1.00E-06 1.00E-07 1.00E-07 1.00E-07 1.00E-07 1.00E-07 1.00E-07 ABOVE RANGE 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
IN RANGE 7101. 8494. 10470. 13228. 15391. 20210. 32244. 34568. 34741. 34417.
BELOW RANGE 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
ZERO 27884. 26462. 24430. 21560. 19431. 14527. 2596. 323. 0. 0.
TOTAL X/Qs 34985. 34956. 34900. 34788. 34822. 34737. 34840. 34891. 34741. 34417.
% NON ZERO 20.30 24.30 30.00 38.02 44.20 58.18 92.55 99.07 100.00 100.00 Data extracted from the ARCON96-NAI model run designated as clwA96_04:
DISTRIBUTION
SUMMARY
DATA BY AVERAGING INTERVAL AVER. PER. 1 2 4 8 12 24 96 168 360 720 UPPER LIM. 1.00E-02 1.00E-02 1.00E-02 1.00E-02 1.00E-03 1.00E-03 1.00E-03 1.00E-03 1.00E-03 1.00E-03 LOW LIM. 1.00E-06 1.00E-06 1.00E-06 1.00E-06 1.00E-07 1.00E-07 1.00E-07 1.00E-07 1.00E-07 1.00E-07 ABOVE RANGE 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
IN RANGE 7101. 8494. 10470. 13228. 15391. 20210. 32244. 34568. 34741. 20411.
BELOW RANGE 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
ZERO 27884. 26462. 24430. 21560. 19431. 14527. 2596. 323. 0. 0.
TOTAL X/Qs 34985. 34956. 34900. 34788. 34822. 34737. 34840. 34891. 34741. 20411.
% NON ZERO 20.30 24.30 30.00 38.02 44.20 58.18 92.55 99.07 100.00 100.00 Please address the following:
RAI-1a Given the preceding observations from the Staffs safety review, please confirm the validity of the ARCON96-NAI calculations of the 4- to 30-day (96- to 720-hour) averaging interval X/Qs.
RAI-1b If that portion of the ARCON96-NAI dispersion model is inaccurate, revise the code and any affected documentation accordingly.
RAI-1c Also, if that portion of the ARCON96-NAI dispersion model is inaccurate, either:
- revise all of the model runs and any affected tables and/or figures in Enclosure 1 of the December 1, 2021, supplemental submittal, evaluate whether any of the conclusions drawn from the previous modeling results change (as reflected in Table 3-29 of Enclosure 1) and update as necessary, and revise all affected dose calculations; or
LAR to Implement Alternative Source Term for Callaway Unit 1 Request for Additional Information Related to Onsite Dispersion Modeling Analysis
- document and provide other adequate justification for the retention of the previous ARCON96-NAI modeling results and related dose calculations and/or revisions to that modeling and those dose calculations.