ML23103A431

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Emergency Core Cooling System Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2022
ML23103A431
Person / Time
Site: Palo Verde  Arizona Public Service icon.png
Issue date: 04/13/2023
From: Cox M
Arizona Public Service Co
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
102-08601-MSC/CJS
Download: ML23103A431 (1)
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Text

10 CFR 50.46(a)(3)(ii)

Palo Verde Nuclear Generating Station 5871 S. Wintersburg Road 102-08601-MSC/CJS Tonopah, AZ 85354 April 13, 2023

ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station Units 1, 2, and 3 Renewed Operating License Nos. NPF-41, NPF-51 and NPF-74 Docket Nos. STN 50-528, 50-529, 50-530 Emergency Core Cooling System Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2022

Pursuant to 10 CFR 50.46(a)(3)(ii), Arizona Public Service Company (APS) is providing a summary of the cumulative effects on calculated peak cladding temperature (PCT) for the Palo Verde Nuclear Generating Station (PVNGS) due to changes or errors in emergency core cooling system (ECCS) performance evaluation models (EMs) for the calendar year (CY) 2022.

The following bullets summarize PVNGS ECCS performance relative to the 10 CFR 50.46 annual reporting requirements:

A member of the STARS Alliance LLC Callaway Diablo Canyon Palo Verde Wolf Creek 102-08601-MSC/CJS ATTN: Document Control Desk U.S. Nuclear Regulatory Commission ECCS Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2022 Page 2

delta PCT assessments at the end of CY 2022 was 1678 °F for PVNGS Units 1 and 3 (CE16STD and CE16NGF fuel types), 1618 °F for PVNGS Unit 2 (CE16STD fuel type), and 1620 °F for PVNGS Unit 2 (CE16HTP fuel type).

These values are less than the 10 CFR 50.46(b)(1) regulatory limit of 2200 °F.

  • PCT is not calculated as part of the post loss of coolant accident (LOCA) long-term cooling (LTC) analysis, therefore, there are no changes or errors in the LTC models that affect PCT.

The enclosure provides a more detailed discussion of the absolute PCT effects in the evaluation models for pressurized water reactors ECCS performance analyses in CY 2022 for PVNGS.

No commitments are being made to the NRC by this letter.

Should you need further information regarding this submittal, please contact me, at (623) 393-5753.

Sincerely,

Digitally signed by Cox, Matthew Cox, Matthew S(Z05628) S(Z05628)

Date: 2023.04.13 11:24:54 -07'00'

Matthew S. Cox Licensing Department Leader, Nuclear Regulatory Affairs

MSC/CJS/cr

Enclosure:

Summary of Cumulative Effects on Calculated Peak Clad Temperature (PCT) for PVNGS Due to Changes/Errors in Emergency Core Cooling System (ECCS) Performance Evaluation Models

cc:

R. J. Lewis Acting NRC Region IV Regional Administrator S. P. Lingam NRC NRR Project Manager for PVNGS L. N. Merker NRC Senior Resident Inspector for PVNGS

Enclosure

Summary of Cumulative Effects on Calculated Peak Clad Temperature (PCT) for PVNGS Due to Changes/Errors in Emergency Core Cooling System (ECCS) Performance Evaluation Models

Enclosure Summary of Cumulative Effects on Calculated PCT for PVNGS Due to Changes/Errors in ECCS Performance Evaluation Models

Palo Verde Unit 1 Large Break Loss of Coolant Accident (LBLOCA)

Peak Cladding Temperature (PCT) Summary Sheet Westinghouse CE16STD and CE16NGF Fuel Assemblies

Utility Name: Arizona Public Service Company (APS)

Plant Name: Palo Verde Nuclear Generating Station, Unit 1 Calendar Year (CY) 2022 Operating Cycle(s) Cycles 23 and 24 Fuel Type(s) Westinghouse CE16STD and CE16NGF Evaluation Model (EM): Westinghouse 1999 EM EM

Description:

Appendix K Large Break

PCT Reference(s) Note(s)

Analysis of Record (AOR) 2130 °F 1, 2 1

Net Absolute PCT Effect PCT Effect Reference(s) Note(s)

Assessments A. Cumulative 10 CFR 50.46 Changes and + 0 °F + 0 °F 3 -----

Error Corrections - Previously Reported B. 10 CFR 50.46 Changes and Error + 0 °F + 0 °F ----- -----

Corrections - New for CY 2022 C. Absolute Sum of Cumulative 10 CFR ----- + 0 °F ----- -----

50.46 Changes and Error Corrections

AOR + Assessments PCT = 2130 °F The sum of the PCT from the most recent AOR using an acceptable evaluation model, and the estimated cumulative effects of changes and error corrections made since that AOR, remains less than the 10 CFR 50.46(b)(1) regulatory limit of 2200 °F.

References

1. Westinghouse WCAP-18076-P, Revision 1, Reload Transition Safety Report for Palo Verde Nuclear Generating Station Units 1, 2 and 3 with Combustion Engineering 16x16 Next Generation Fuel, June 30, 2016.
2. Westinghouse CN-TLA-14-016, Revision 2, Palo Verde Units 1, 2 and 3 LBLOCA Bounding ECCS Performance Analysis for NGF Transition, May 12, 2017.
3. APS Letter to NRC, 102-08428-KJG/MSC, Palo Verde Nuclear Generating Station Units 1, 2, and 3; License Nos. NPF-41, NPF-51 and NPF-74; Docket Nos. STN 50-528, 50-529, 50-530; Emergency Core Cooling System Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2021, April 26, 2022. [NRC ADAMS Accession No. ML22116A110.]

Notes

1. Palo Verde Unit 1 began CY 2022 in operating cycle 23, that units second fuel design transition cycle with 41 Westinghouse standard fuel (CE16STD) assemblies and 200 Westinghouse Next Generation Fuel (CE16NGF) assemblies. Unit 1 ended the CY in operating cycle 24, that units third fuel design transition cycle with 1 Westinghouse CE16STD center assembly and 240 Westinghouse CE16NGF assemblies. The PCT reported above (2130 °F) is bounding for both fuel types and for both operating cycles.

1 Enclosure Summary of Cumulative Effects on Calculated PCT for PVNGS Due to Changes/Errors in ECCS Performance Evaluation Models

Palo Verde Unit 2 Large Break Loss of Coolant Accident (LBLOCA)

Peak Cladding Temperature (PCT) Summary Sheet Westinghouse CE16STD Fuel Assemblies

Utility Name: Arizona Public Service Company (APS)

Plant Name: Palo Verde Nuclear Generating Station, Unit 2 Calendar Year (CY) 2022 Operating Cycle(s) Cycle 24 Fuel Type(s) Westinghouse CE16STD Evaluation Model (EM): Westinghouse 1999 EM EM

Description:

Appendix K Large Break

PCT Reference(s) Note(s)

Analysis of Record (AOR) 2106 °F 1, 2 1

Net Absolute PCT Effect PCT Effect Reference(s) Note(s)

Assessments A. Cumulative 10 CFR 50.46 Changes + 0 °F + 0 °F 3 -----

and Error Corrections - Previously Reported B. 10 CFR 50.46 Changes and Error + 0 °F + 0 °F ----- -----

Corrections - New for CY 2022 C. Absolute Sum of Cumulative 10 CFR ----- + 0 °F ----- -----

50.46 Changes and Error Corrections

AOR + Assessments PCT = 2106 °F

The sum of the PCT from the most recent AOR using an acceptable evaluation model, and the estimated cumulative effects of changes and error corrections made since that AOR, remains less than the 10 CFR 50.46(b)(1) regulatory limit of 2200 °F.

References

1. Westinghouse CVER-09-62, Analysis of Record for Large Break LOCA ECCS Performance Analysis Including Replacement Steam Generators and Simplified Head Implementation for PVNGS Units 1, 2, and 3, August 31, 2009.
2. Westinghouse CN-LAM-09-33, Revision 0, LBLOCA ECCS Performance Analysis for Palo Verde Units 1, 2, and 3 for RSG and SHA Implementation, August 31, 2009.
3. APS Letter to NRC, 102-08428-KJG/MSC, Palo Verde Nuclear Generating Station Units 1, 2, and 3; License Nos. NPF-41, NPF-51 and NPF-74; Docket Nos. STN 50-528, 50-529, 50-530; Emergency Core Cooling System Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2021, April 26, 2022. [NRC ADAMS Accession No. ML22116A110.]

Notes

1. Palo Verde Unit 2 began and ended CY 2022 in operating cycle 24, that units second fuel design transition cycle with 41 Westinghouse standard fuel (CE16STD) assemblies and 200 Framatome High Thermal Performance fuel (CE16HTP) assemblies. The PCT reported above (2106 °F) is bounding for Westinghouse CE16STD fuel only. The PCT for Framatome CE16HTP fuel is addressed on a separate summary sheet.

2 Enclosure Summary of Cumulative Effects on Calculated PCT for PVNGS Due to Changes/Errors in ECCS Performance Evaluation Models

Palo Verde Unit 2 Large Break Loss of Coolant Accident (LBLOCA)

Peak Cladding Temperature (PCT) Summary Sheet Framatome CE16HTP Fuel Assemblies

Utility Name: Arizona Public Service Company (APS)

Plant Name: Palo Verde Nuclear Generating Station, Unit 2 Calendar Year (CY) 2022 Operating Cycle(s) Cycle 24 Fuel Type(s) Framatome CE16HTP Evaluation Model (EM): EMF-2103 Revision 3 EM

Description:

Realistic Large Break

PCT Reference(s) Note(s)

Analysis of Record (AOR) 1752 °F 1, 2, 3 1

Net Absolute PCT Effect PCT Effect Reference(s) Note(s)

Assessments A. Cumulative 10 CFR 50.46 Changes and + 0 °F + 0 °F 4 2 Error Corrections - Previously Reported B. 10 CFR 50.46 Changes and Error + 0 °F + 0 °F ----- -----

Corrections - New for CY 2022 C. Absolute Sum of Cumulative 10 CFR ----- + 0 °F ----- -----

50.46 Changes and Error Corrections

AOR + Assessments PCT = 1752 °F The sum of the PCT from the most recent AOR using an acceptable evaluation model, and the estimated cumulative effects of changes and error corrections made since that AOR, remains less than the 10 CFR 50.46(b)(1) regulatory limit of 2200 °F.

References

1. Framatome 32-9268125, Revision 0, Palo Verde VQP Realistic Large Break LOCA (RLBLOCA) Uncertainty Analysis, February 21, 2018.
2. Framatome ANP-3639P, Revision 1, Palo Verde Units 1, 2, and 3 Realistic Large Break LOCA Summary Report; Licensing Report, May 2018.
3. Framatome ANP-3639P, Revision 1Q1P, Revision 0, P alo Verde Units 1, 2, and 3 Realistic Large Break LOCA Summary Report; NRC RAI Responses; Licensing Report, September 2019.
4. APS Letter to NRC, 102-08428-KJG/MSC, Palo Verde Nuclear Generating Station Units 1, 2, and 3; License Nos. NPF-41, NPF-51 and NPF-74; Docket Nos. STN 50-528, 50-529, 50-530; Emergency Core Cooling System Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2021, April 26, 2022. [NRC ADAMS Accession No. ML22116A110.]

Notes

1. Palo Verde Unit 2 began and ended CY 2022 in operating cycle 24, that units second fuel design transition cycle with 41 Westinghouse standard fuel (CE16STD) assemblies and 200 Framatome High Thermal Performance fuel (CE16HTP) assemblies. The PCT reported above (1752 °F) is bounding for Framatome CE16HTP fuel only. The PCT for Westinghouse CE16STD fuel is addressed on a separate summary sheet.
2. Changes and error corrections previously reported in Reference 4 include Framatome Condition Reports 2020-0441 (Radiation Enclosure Input Error), 2020-1165 (Radial Power Distribution Maps), and 2020-1554 (Power History Inputs Error).

3 Enclosure Summary of Cumulative Effects on Calculated PCT for PVNGS Due to Changes/Errors in ECCS Performance Evaluation Models

Palo Verde Unit 3 Large Break Loss of Coolant Accident (LBLOCA)

Peak Cladding Temperature (PCT) Summary Sheet Westinghouse CE16STD and CE16NGF Fuel Assemblies

Utility Name: Arizona Public Service Company (APS)

Plant Name: Palo Verde Nuclear Generating Station, Unit 3 Calendar Year (CY) 2022 Operating Cycle(s) Cycles 23 and 24 Fuel Type(s) Westinghouse CE16STD and CE16NGF Evaluation Model (EM): Westinghouse 1999 EM EM

Description:

Appendix K Large Break

PCT Reference(s) Note(s)

Analysis of Record (AOR) 2130 °F 1, 2 1

Net Absolute PCT Effect PCT Effect Reference(s) Note(s)

Assessments A. Cumulative 10 CFR 50.46 Changes and + 0 °F + 0 °F 3 -----

Error Corrections - Previously Reported B. 10 CFR 50.46 Changes and Error + 0 °F + 0 °F ----- -----

Corrections - New for CY 2022 C. Absolute Sum of Cumulative 10 CFR ----- + 0 °F ----- -----

50.46 Changes and Error Corrections

AOR + Assessments PCT = 2130 °F The sum of the PCT from the most recent AOR using an acceptable evaluation model, and the estimated cumulative effects of changes and error corrections made since that AOR, remains less than the 10 CFR 50.46(b)(1) regulatory limit of 2200 °F.

References

1. Westinghouse WCAP-18076-P, Revision 1, Reload Transition Safety Report for Palo Verde Nuclear Generating Station Units 1, 2 and 3 with Combustion Engineering 16x16 Next Generation Fuel, June 30, 2016.
2. Westinghouse CN-TLA-14-016, Revision 2, Palo Verde Units 1, 2 and 3 LBLOCA Bounding ECCS Performance Analysis for NGF Transition, May 12, 2017.
3. APS Letter to NRC, 102-08428-KJG/MSC, Palo Verde Nuclear Generating Station Units 1, 2, and 3; License Nos. NPF-41, NPF-51 and NPF-74; Docket Nos. STN 50-528, 50-529, 50-530; Emergency Core Cooling System Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2021, April 26, 2022. [NRC ADAMS Accession No. ML22116A110.]

Notes

1. Palo Verde Unit 3 began CY 2022 in operating cycle 23, that units second fuel design transition cycle with 41 Westinghouse standard fuel (CE16STD) assemblies and 200 Westinghouse Next Generation Fuel (CE16NGF) assemblies. Unit 3 ended the CY in operating cycle 24, that units third fuel design transition cycle with 1 Westinghouse CE16STD center assembly and 240 Westinghouse CE16NGF assemblies. The PCT reported above (2130 °F) is bounding for both fuel types and for both operating cycles.

4 Enclosure Summary of Cumulative Effects on Calculated PCT for PVNGS Due to Changes/Errors in ECCS Performance Evaluation Models

Palo Verde Unit 1 Small Break Loss of Coolant Accident (SBLOCA)

Peak Cladding Temperature (PCT) Summary Sheet Westinghouse CE16STD and CE16NGF Fuel Assemblies

Utility Name: Arizona Public Service Company (APS)

Plant Name: Palo Verde Nuclear Generating Station, Unit 1 Calendar Year (CY) 2022 Operating Cycle(s) Cycles 23 and 24 Fuel Type(s) Westinghouse CE16STD and CE16NGF Evaluation Model (EM): Westinghouse S2M EM

Description:

Appendix K Small Break

PCT Reference(s) Note(s)

Analysis of Record (AOR) 1678 °F 1, 2 1

Net Absolute PCT Effect PCT Effect Reference(s) Note(s)

Assessments A. Cumulative 10 CFR 50.46 Changes and + 0 °F + 0 °F 3 -----

Error Corrections - Previously Reported B. 10 CFR 50.46 Changes and Error + 0 °F + 0 °F ----- -----

Corrections - New for CY 2022 C. Absolute Sum of Cumulative 10 CFR ----- + 0 °F ----- -----

50.46 Changes and Error Corrections

AOR + Assessments PCT = 1678 °F The sum of the PCT from the most recent AOR using an acceptable evaluation model, and the estimated cumulative effects of changes and error corrections made since that AOR, remains less than the 10 CFR 50.46(b)(1) regulatory limit of 2200 °F.

References

1. Westinghouse CN-TLA-14-020, Revision 1, Palo Verde Units 1, 2 and 3 SBLOCA Bounding ECCS Performance Analysis for NGF Transition, January 7, 2016.
2. Westinghouse WCAP-18076-P, Revision 1, Reload Transition Safety Report for Palo Verde Nuclear Generating Station Units 1, 2 and 3 with Combustion Engineering 16x16 Next Generation Fuel, June 30, 2016.
3. APS Letter to NRC, 102-08428-KJG/MSC, Palo Verde Nuclear Generating Station Units 1, 2, and 3; License Nos. NPF-41, NPF-51 and NPF-74; Docket Nos. STN 50-528, 50-529, 50-530; Emergency Core Cooling System Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2021, April 26, 2022. [NRC ADAMS Accession No. ML22116A110.]

Notes

1. Palo Verde Unit 1 began CY 2022 in operating cycle 23, that units second fuel design transition cycle with 41 Westinghouse standard fuel (CE16STD) assemblies and 200 Westinghouse Next Generation Fuel (CE16NGF) assemblies. Unit 1 ended the CY in operating cycle 24, that units third fuel design transition cycle with 1 Westinghouse CE16STD center assembly and 240 Westinghouse CE16NGF assemblies. The PCT reported above (1678 °F) is bounding for both fuel types and for both operating cycles.

5 Enclosure Summary of Cumulative Effects on Calculated PCT for PVNGS Due to Changes/Errors in ECCS Performance Evaluation Models

Palo Verde Unit 2 Small Break Loss of Coolant Accident (SBLOCA)

Peak Cladding Temperature (PCT) Summary Sheet Westinghouse CE16STD Fuel Assemblies

Utility Name: Arizona Public Service Company (APS)

Plant Name: Palo Verde Nuclear Generating Station, Unit 2 Calendar Year (CY) 2022 Operating Cycle(s) Cycle 24 Fuel Type(s) Westinghouse CE16STD Evaluation Model (EM): Westinghouse S2M EM

Description:

Appendix K Small Break

PCT Reference(s) Note(s)

Analysis of Record (AOR) 1618 °F 1 1

Net Absolute PCT Effect PCT Effect Reference(s) Note(s)

Assessments A. Cumulative 10 CFR 50.46 Changes and + 0 °F + 0 °F 2 -----

Error Corrections - Previously Reported B. 10 CFR 50.46 Changes and Error + 0 °F + 0 °F ----- -----

Corrections - New for CY 2022 C. Absolute Sum of Cumulative 10 CFR ----- + 0 °F ----- -----

50.46 Changes and Error Corrections

AOR + Assessments PCT = 1618 °F The sum of the PCT from the most recent AOR using an acceptable evaluation model, and the estimated cumulative effects of changes and error corrections made since that AOR, remains less than the 10 CFR 50.46(b)(1) regulatory limit of 2200 °F.

References

1. Westinghouse A-PV-FE-0149, Revision 1, Palo Verde Units 1, 2 and 3 S2M Bounding SBLOCA ECCS Performance Analysis, March 22, 2002.
2. APS Letter to NRC, 102-08428-KJG/MSC, Palo Verde Nuclear Generating Station Units 1, 2, and 3; License Nos. NPF-41, NPF-51 and NPF-74; Docket Nos. STN 50-528, 50-529, 50-530; Emergency Core Cooling System Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2021, April 26, 2022. [NRC ADAMS Accession No. ML22116A110.]

Notes

1. Palo Verde Unit 2 began and ended CY 2022 in operating cycle 24, that units second fuel design transition cycle with 41 Westinghouse standard fuel (CE16STD) assemblies and 200 Framatome High Thermal Performance fuel (CE16HTP) assemblies. The PCT reported above (1618 °F) is bounding for Westinghouse CE16STD fuel only. The PCT for Framatome CE16HTP fuel is addressed on a separate summary sheet.

6 Enclosure Summary of Cumulative Effects on Calculated PCT for PVNGS Due to Changes/Errors in ECCS Performance Evaluation Models

Palo Verde Unit 2 Small Break Loss of Coolant Accident (SBLOCA)

Peak Cladding Temperature (PCT) Summary Sheet Framatome CE16HTP Fuel Assemblies

Utility Name: Arizona Public Service Company (APS)

Plant Name: Palo Verde Nuclear Generating Station, Unit 2 Calendar Year (CY) 2022 Operating Cycle(s) Cycle 24 Fuel Type(s) Framatome CE16HTP Evaluation Model (EM): EMF-2328 Revision 0 and Supplement 1 Revision 0 EM

Description:

Appendix K Small Break

PCT Reference(s) Note(s)

Analysis of Record (AOR) 1620 °F 1, 2, 3 1

Net Absolute PCT Effect PCT Effect Reference(s) Note(s)

Assessments A. Cumulative 10 CFR 50.46 Changes and + 0 °F + 0 °F 4 -----

Error Corrections - Previously Reported B. 10 CFR 50.46 Changes and Error + 0 °F + 0 °F ----- -----

Corrections - New for CY 2022 C. Absolute Sum of Cumulative 10 CFR ----- + 0 °F ----- -----

50.46 Changes and Error Corrections

AOR + Assessments PCT = 1620 °F The sum of the PCT from the most recent AOR using an acceptable evaluation model, and the estimated cumulative effects of changes and error corrections made since that AOR, remains less than the 10 CFR 50.46(b)(1) regulatory limit of 2200 °F.

References

1. Framatome 32-9268122, Revision 0, Palo Verde VQP SBLOCA Transient Analyses, January 18, 2018.
2. Framatome ANP-3640P, Revision 0, Palo Verde Units 1, 2, and 3 Small Break LOCA Summary Report; Licensing Report, March 2018.
3. Framatome ANP-3640Q1P, Revision 0, Palo Verde Units 1, 2, and 3 Small Break LOCA Summary Report; NRC RAI Responses; Licensing Report, September 2019.
4. APS Letter to NRC, 102-08428-KJG/MSC, Palo Verde Nuclear Generating Station Units 1, 2, and 3; License Nos. NPF-41, NPF-51 and NPF-74; Docket Nos. STN 50-528, 50-529, 50-530; Emergency Core Cooling System Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2021, April 26, 2022. [NRC ADAMS Accession No. ML22116A110.]

Notes

1. Palo Verde Unit 2 began and ended CY 2022 in operating cycle 24, that units second fuel design transition cycle with 41 Westinghouse standard fuel (CE16STD) assemblies and 200 Framatome High Thermal Performance fuel (CE16HTP) assemblies. The PCT reported above (1620 °F) is bounding for Framatome CE16HTP fuel only. The PCT for Westinghouse CE16STD fuel is addressed on a separate summary sheet.

7 Enclosure Summary of Cumulative Effects on Calculated PCT for PVNGS Due to Changes/Errors in ECCS Performance Evaluation Models

Palo Verde Unit 3 Small Break Loss of Coolant Accident (SBLOCA)

Peak Cladding Temperature (PCT) Summary Sheet Westinghouse CE16STD and CE16NGF Fuel Assemblies

Utility Name: Arizona Public Service Company (APS)

Plant Name: Palo Verde Nuclear Generating Station, Unit 3 Calendar Year (CY) 2022 Operating Cycle(s) Cycles 23 and 24 Fuel Type(s) Westinghouse CE16STD and CE16NGF Evaluation Model (EM): Westinghouse S2M EM

Description:

Appendix K Small Break

PCT Reference(s) Note(s)

Analysis of Record (AOR) 1678 °F 1, 2 1

Net Absolute PCT Effect PCT Effect Reference(s) Note(s)

Assessments A. Cumulative 10 CFR 50.46 Changes and + 0 °F + 0 °F 3 -----

Error Corrections - Previously Reported B. 10 CFR 50.46 Changes and Error + 0 °F + 0 °F ----- -----

Corrections - New for CY 2022 C. Absolute Sum of Cumulative 10 CFR ----- + 0 °F ----- -----

50.46 Changes and Error Corrections

AOR + Assessments PCT = 1678 °F

The sum of the PCT from the most recent AOR using an acceptable evaluation model, and the estimated cumulative effects of changes and error corrections made since that AOR, remains less than the 10 CFR 50.46(b)(1) regulatory limit of 2200 °F.

References

1. Westinghouse CN-TLA-14-020, Revision 1, Palo Verde Units 1, 2 and 3 SBLOCA Bounding ECCS Performance Analysis for NGF Transition, January 7, 2016.
2. Westinghouse WCAP-18076-P, Revision 1, Reload Transition Safety Report for Palo Verde Nuclear Generating Station Units 1, 2 and 3 with Combustion Engineering 16x16 Next Generation Fuel, June 30, 2016.
3. APS Letter to NRC, 102-08428-KJG/MSC, Palo Verde Nuclear Generating Station Units 1, 2, and 3; License Nos. NPF-41, NPF-51 and NPF-74; Docket Nos. STN 50-528, 50-529, 50-530; Emergency Core Cooling System Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2021, April 26, 2022. [NRC ADAMS Accession No. ML22116A110.]

Notes

1. Palo Verde Unit 3 began CY 2022 in operating cycle 23, that units second fuel design transition cycle with 41 Westinghouse standard fuel (CE16STD) assemblies and 200 Westinghouse Next Generation Fuel (CE16NGF) assemblies. Unit 3 ended the CY in operating cycle 24, that units third fuel design transition cycle with 1 Westinghouse CE16STD center assembly and 240 Westinghouse CE16NGF assemblies. The PCT reported above (1678 °F) is bounding for both fuel types and for both operating cycles.

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