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| {{#Wiki_filter:fl Xcel Energy 1717 Wakonade Drive Welch, MN 55089 June 14, 2023 L-PI-23-016 10 CFR 50.46 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Prairie Island Nuclear Generating Plant, Units 1 and 2 Docket Nos. 50-282 and 50-306 Renewed Facility Operating License Nos. DPR-42 and DPR-60 2022 10 CFR 50.46 LOCA Annual Report | | {{#Wiki_filter:}} |
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| ==References:==
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| : 1) Westinghouse Letter NSPM-LOCA-TM-A5-000002 Prairie Island Units 1 and 2 10 CFR 50.46 Annual Notification and Reporting for 2022, dated February 10, 2023
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| : 2) Westinghouse Letter PWR-LOCA-TM-A5-000011 Revised 10 CFR 50.46 Reporting Page for ASTRUM & CQD EM NON-CONSERVATION OF ENERGY IN THE GENERALIZED ENERGY DEPOSITION MODEL, dated March 9, 2023 Pursuant to 10 CFR 50.46(a)(3)(ii), Northern States Power Company, a Minnesota corporation, doing business as Xcel Energy (hereafter NSPM), hereby submits the 2022 annual report of changes and errors associated with the Prairie Island Nuclear Generating Plant (PINGP), Units 1 and 2 Emergency Core Cooling System (ECCS) analyses (Enclosure 1).
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| The peak cladding temperature (PCT) for PINGP Unit 1 and Unit 2 were unchanged since the last annual report for the LOCA analyses. The plant specific changes and errors (absolute value) since the last annual report are summarized below:
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| LBLOCA Unit 1 None SBLOCA Unit 1 None LBLOCA Unit 2 None SBLOCA Unit 2 None
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| L-Pl-23-016 Page 2 contains Reference 1 with the exception that page 3 of 10 of the enclosure is a replacement page from Reference 2.
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| If you have any questions about this submittal, please contact Carrie Seipp, Senior Regulatory Engineer, at 612-330-5576.
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| Summary of Commitments This letter makes no new commitments and no revisions to existing commitments.
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| Timothy P. Borgen Plant Manager, Prairie Island Nuclear Generating Plant Northern States Power Company - Minnesota Enclosure (1) cc: Administrator, Region Ill, USNRC Project Manager, Prairie Island, USNRC Resident Inspector, Prairie Island, USNRC
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| ENCLOSURE 1 1 of 10
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| Westinghouse Non-Proprietary Class 3
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| @westinghouse Westinghouse Electric Company 1000 Westinghouse Drive Cranberry Township, Pennsylvania 16066 USA Direct tel: (412) 374-3054 e-mail: landon.conner@westinghouse.com Our ref: NSPM-LOCA-TM-A5-000002 Prairie Island Units 1 and 2 10 CFR 50.46 Annual Notification and Reporting for 2022
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| ==Dear Sir or Madam:==
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| This is a notification of 10 CFR 50.46 reporting information pertaining to the Westinghouse Electric Company Evaluation Models/analyses. As committed to in WCAP-13451, Westinghouse Methodology for Implementation of 10 CFR 50.46 Reporting, Westinghouse is providing an Annual Report for Emergency Core Cooling System (ECCS) Evaluation Model changes and errors for the 2022 model year. All necessary standardized reporting pages for any changes and errors for the Evaluation Models utilized for your plant(s) are enclosed, consistent with the commitment following the NUPIC audit in early 1999. Peak Clad Temperature (PCT) summary sheets are enclosed. All necessary revisions for any non-zero, non-discretionary PCT changes have been included. Changes with estimated PCT impacts of 0°F may not be presented on the PCT summary sheet. The Evaluation Model changes and errors (except any plant-specific errors in the application of the model) have been provided to the NRC via Westinghouse letter.
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| This information is for your use in making a determination relative to the reporting requirements of 10 CFR 50.46. The information that is provided in this letter was prepared in accordance with Westinghouse's Quality Management System (QMS). Please contact your LOCA plant cognizant engineers (PCEs), Samuel Gonsowski (412-374-2408) and Tristan Gibbons (412-374-2232), if there are any questions concerning this information.
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| Author: (Electronically Approved)* Verifier: (Electronically Approved)*
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| Landon A. Conner Heather McMillen Approved: (Electronically Approved)*
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| Amy J. Colussy
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| ==Attachment:==
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| 10 CFR 50.46 Reporting Text and PCT Summary Sheets (8 Pages)
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| *Electronically approved records are authenticated in the electronic document management system.
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| © 2023 Westinghouse Electric Company LLC All Rights Reserved 2 of 10
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| *** This record was final approved on 2/10/2023, 7:50:15 AM. (This statement was added by the PRIME system upon its validation)
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| Westinghouse Non-Proprietary Class 3 of PWR-LOCA-TM-A5-000011, Revision 0 NON-CONSERVATION OF ENERGY IN THE GENERALIZED ENERGY DEPOSITION MODEL
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| ===Background===
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| The Generalized Energy Deposition Model (GEDM) used within -WCOBRA/TRAC is described in Section 8-6-2 of WCAP-12945-P-A [1] and Section 8-6-2 of WCAP-16009-P-A [2]. Non-conservation of the deposited energy was discovered to exist, whereby a very small fraction of the redistributed energy was not being included in the core balance rods. The energy deposited to the hot rod and hot assembly was confirmed to be conserved and correct. This item represents a Non-Discretionary Change in accordance with Section 4.1.2 of WCAP-13451.
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| Affected Evaluation Model(s) 1996 Westinghouse Best Estimate Large Break LOCA Evaluation Model 2004 Westinghouse Realistic Large Break LOCA Evaluation Model Using ASTRUM Estimated Effect The error was qualitatively evaluated, and the nature of the error leads to an estimated peak cladding temperature impact of 0°F.
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| Reference(s)
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| : 1) WCAP-12945-P-A, Revision 2 Volume 1, and Revision 1 Volumes 2 - 5, Code Qualification Document for Best Estimate LOCA Analysis, March 1998.
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| : 2) WCAP-16009-P-A, Revision 0, Realistic Large-Break LOCA Evaluation Methodology Using the Automated Statistical Treatment Of Uncertainty Method (ASTRUM), January 2005.
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| 2023 Westinghouse Electric Company LLC All Rights Reserved 316ofof1017
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| *** This record was final approved on 3/9/2023, 11:31:37 AM. (This statement was added by the PRIME system upon its validation)
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| Attachment to NSPM-LOCA-TM-A5-000002 Page 2 of 8 LOCA Peak Cladding Temperature (PCT) Summary Plant Name: PRAIRIE ISLAND 1 EM: NOTRUMP AOR
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| == Description:==
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| Appendix K Small Break Summary Sheet Status: Current PRAIRIE ISLAND 1 NSP_LOCA-50.46_NSP_Base_Appendix_K_SBLOCA - 1.2 V.V PCT (°F) Reference # Note #
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| ANALYSIS-OF-RECORD 959 1 AOR + ASSESSMENTS PCT = 959.0 °F REFERENCES 1 LTR-LIS-08-158, Transmittal of Future Prairie Island Units 1 and 2 PCT Summaries, February 2008.
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| NOTES:
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| (a) None Version: PRAIRIE ISLAND 1 NSP_LOCA-50.46_NSP_Base_Appendix_K_SBLOCA - 1.2 V.V 2023 Westinghouse Electric Company LLC All Rights Reserved 4 of 10
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| *** This record was final approved on 2/10/2023, 7:50:15 AM. (This statement was added by the PRIME system upon its validation)
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| Attachment to NSPM-LOCA-TM-A5-000002 Page 3 of 8 LOCA Peak Cladding Temperature (PCT) Summary Plant Name: PRAIRIE ISLAND 1 EM: ASTRUM (2004)
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| AOR
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| == Description:==
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| Best Estimate Large Break Summary Sheet Status: IFBA/Gad PRAIRIE ISLAND 1 NSP_LOCA-50.46_NSP_IFBA_GAD_ASTRUM - 1.3 V.V PCT (°F) Reference # Note #
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| ANALYSIS-OF-RECORD 1765 1 Delta PCT Reporting ASSESSMENTS* (°F) Reference # Note # Year**
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| : 1. Revised Heat Transfer 2013
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| -2 3 Multiplier Distributions
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| : 2. Error in Burst Strain Application 25 4 2013
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| : 3. Evaluation of the Introduction of 2018 0 2 IFBA Fuel
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| : 4. Evaluation of Fuel Pellet 2012 Thermal Conductivity 227 5 (a)
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| Degradation and Peaking Factor Burndown AOR + ASSESSMENTS PCT = 2015.0 °F
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| * The licensee should determine the reportability of these assessments pursuant to 10 CFR 50.46.
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| ** The Reporting Year refers to the annual reporting year in which this assessment was included.
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| REFERENCES 1 WCAP-17783-P, Best-Estimate Analysis of the Large-Break Loss-of-Coolant Accident for Prairie Island Units 1 and 2 with Replacement Steam Generators Using ASTRUM Methodology, June 2013.
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| 2 LTR-LIS-15-287, Rev. 1, Prairie Island Units 1 and 2, 10 CFR 50.46 Notification and Reporting for the Revised Fuel Pellet Thermal Conductivity Degradation and Peaking Factor Burndown Evaluation and the Introduction of IFBA Fuel, September 2015.
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| 3 LTR-LIS-13-366, Revision 1, Prairie Island Units 1 and 2 10 CFR 50.46 Report for Revised Heat Transfer Multiplier Distributions, August 2013.
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| 4 LTR-LIS-14-50, Prairie Island Units 1 and 2 10 CFR 50.46 Report for the HOTSPOT Burst Strain Error Correction, January 2014.
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| 5 LTR-LIS-12-414, Prairie Island Units 1 and 2, 10 CFR 50.46 Notification and Reporting for Fuel Pellet Thermal Conductivity Degradation and Peaking Factor Burndown, September 2012.
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| Version: PRAIRIE ISLAND 1 NSP_LOCA-50.46_NSP_IFBA_GAD_ASTRUM - 1.3 V.V 2023 Westinghouse Electric Company LLC All Rights Reserved 5 of 10
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| *** This record was final approved on 2/10/2023, 7:50:15 AM. (This statement was added by the PRIME system upon its validation)
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| Attachment to NSPM-LOCA-TM-A5-000002 Page 4 of 8 NOTES:
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| (a) This evaluation credits peaking factor burndown, see Reference 5.
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| Version: PRAIRIE ISLAND 1 NSP_LOCA-50.46_NSP_IFBA_GAD_ASTRUM - 1.3 V.V 2023 Westinghouse Electric Company LLC All Rights Reserved 6 of 10
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| *** This record was final approved on 2/10/2023, 7:50:15 AM. (This statement was added by the PRIME system upon its validation)
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| Attachment to NSPM-LOCA-TM-A5-000002 Page 5 of 8 LOCA Peak Cladding Temperature (PCT) Summary Plant Name: PRAIRIE ISLAND 2 EM: NOTRUMP AOR
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| == Description:==
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| Appendix K Small Break Summary Sheet Status: Current PRAIRIE ISLAND 2 NRP_LOCA-50.46_NRP_Base_Appendix_K_SBLOCA - 1.2 V.V PCT (°F) Reference # Note #
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| ANALYSIS-OF-RECORD 959 1,2 a AOR + ASSESSMENTS PCT = 959.0 °F REFERENCES 1 LTR-LIS-08-158, Transmittal of Future Prairie Island Units 1 and 2 PCT Summaries, February 2008.
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| 2 LTR-LIS-13-274, Prairie Island Units 1 and 2, 10 CFR 50.46 Summary Sheets for the Evaluation to Support the Unit 2 Installation of AREVA Model 56/19 Replacement Steam Generators (RSGs), June 2013.
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| NOTES:
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| (a) The Unit 1 AOR is applicable to Unit 2 with the RSGs installed.
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| Version: PRAIRIE ISLAND 2 NRP_LOCA-50.46_NRP_Base_Appendix_K_SBLOCA - 1.2 V.V 2023 Westinghouse Electric Company LLC All Rights Reserved 7 of 10
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| *** This record was final approved on 2/10/2023, 7:50:15 AM. (This statement was added by the PRIME system upon its validation)
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| Attachment to NSPM-LOCA-TM-A5-000002 Page 6 of 8 LOCA Peak Cladding Temperature (PCT) Summary Plant Name: PRAIRIE ISLAND 2 EM: ASTRUM (2004)
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| AOR
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| == Description:==
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| Best Estimate Large Break Summary Sheet Status: IFBA/Gad PRAIRIE ISLAND 2 NRP_LOCA-50.46_NRP_IFBA_GAD_ASTRUM - 1.5 V.V PCT (°F) Reference # Note #
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| ANALYSIS-OF-RECORD 1765 1 Delta PCT Reporting ASSESSMENTS* (°F) Reference # Note # Year**
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| : 1. Revised Heat Transfer Multiplier
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| -2 3 2013 Distributions
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| : 2. Error in Burst Strain Application 25 4 2013
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| : 3. Evaluation of the Introduction of 0 2 2019 IFBA Fuel
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| : 4. Evaluation of Fuel Pellet Thermal Conductivity Degradation and 227 5 (a),(b) 2012 Peaking Factor Burndown AOR + ASSESSMENTS PCT = 2015 °F
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| * The licensee should determine the reportability of these assessments pursuant to 10 CFR 50.46.
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| ** The Reporting Year refers to the annual reporting year in which this assessment was included.
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| REFERENCES 1 WCAP-17783-P, Best-Estimate Analysis of the Large-Break Loss-of-Coolant Accident for Prairie Island Units 1 and 2 with Replacement Steam Generators Using ASTRUM Methodology, June 2013.
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| 2 LTR-LIS-15-287, Rev. 1, Prairie Island Units 1 and 2, 10 CFR 50.46 Notification and Reporting for the Revised Fuel Pellet Thermal Conductivity Degradation and Peaking Factor Burndown Evaluation and the Introduction of IFBA Fuel, September 2015.
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| 3 LTR-LIS-13-366, Revision 1, Prairie Island Units 1 and 2 10 CFR 50.46 Report for Revised Heat Transfer Multiplier Distributions, August 2013.
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| 4 LTR-LIS-14-50, Prairie Island Units 1 and 2 10 CFR 50.46 Report for the HOTSPOT Burst Strain Error Correction, January 2014.
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| 5 LTR-LIS-12-414, Prairie Island Units 1 and 2, 10 CFR 50.46 Notification and Reporting for Fuel Pellet Thermal Conductivity Degradation and Peaking Factor Burndown, September 2012.
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| Version: PRAIRIE ISLAND 2 NRP_LOCA-50.46_NRP_IFBA_GAD_ASTRUM - 1.5 V.V 2023 Westinghouse Electric Company LLC All Rights Reserved 8 10 of 10 of 17
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| *** This record was final approved on 2/10/2023, 7:50:15 AM. (This statement was added by the PRIME system upon its validation)
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| Attachment to NSPM-LOCA-TM-A5-000002 Page 7 of 8 NOTES:
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| (a) This evaluation credits peaking factor burndown, see Reference 5.
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| (b) The reporting text and line item originally identified for Unit 1 in Reference 5 is applicable to Unit 2 with RSGs.
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| Version: PRAIRIE ISLAND 2 NRP_LOCA-50.46_NRP_IFBA_GAD_ASTRUM - 1.5 V.V 2023 Westinghouse Electric Company LLC All Rights Reserved 9 of 11 of 10 17
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| *** This record was final approved on 2/10/2023, 7:50:15 AM. (This statement was added by the PRIME system upon its validation)
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| Attachment to NSPM-LOCA-TM-A5-000002 Page 8 of 8 10 CFR 50.46 Reporting SharePoint Site Check:
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| EMs applicable to Prairie Island:
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| Realistic Large Break - ASTRUM (2004)
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| Appendix K Small Break - NOTRUMP 2022 Issues Transmittal Letter Issue Description None None 10 of 10
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| *** This record was final approved on 2/10/2023, 7:50:15 AM. (This statement was added by the PRIME system upon its validation)}}
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