ML21110A035

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Emergency Core Cooling System Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2020
ML21110A035
Person / Time
Site: Palo Verde  Arizona Public Service icon.png
Issue date: 04/16/2021
From: Dilorenzo M
Arizona Public Service Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
102-08264-MDD/MSC
Download: ML21110A035 (11)
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Text

10 CFR50.46(a)(3)(ii PaloVerde NuclearGenerating Station 5871S.Wintersburg Road 102-08264-MDD/MSC Tonopah, Az 85354 April 16,2021 ATTN:DocumentControl Desk U.S.Nuclear Regulatory Commission Washington, DC20555-0001

DearSirs:

Subject:

PaloVerdeNuclear Generating Station Units 1,2,and3 License Nos.NPF-41,NPF-51 and NPF-74 Docket Nos.STN 50-528,50-529, 50-530 EmergencyCoreCooling System Performance Evaluation Models, 10 CFR50.46(a)(3)(ii) Annual Report for2020 Pursuant to10CFR50.46(a)(3)(ii), Arizona PublicService Company (APS) is providing a summaryofthecumulative effects on calculated peak cladding temperature (PCT)for thePalo Verde Nuclear Generating Station (PVNGS) dueto changes orerrors inemergency core cooling systemperformance evaluation models (EM).

During calendar year(CY) 2020there werenonewchanges to,orerrors discovered in,theWestinghouse large break lossofcoolant accident (LBLOCA) 1999EM, which isa 10CFRPart 50,Appendix K,EM.There weretwominor errors discovered in the application oftheFramatome LBLOCA EMF-2103, Revision 3,EMfor Unit 2,which is a realistic theabsolute (or bestestimate magnitudes plus uncertainty) ofAPCTassessments, EM. However, for all thecumulative changes anderrors sum of identified since performance oftheWestinghouse andFramatome LBLOCAanalyses was0 0F throughout CY2020for allthree PVNGSunits.

There werenochanges orerrors that affected PCTinthesmall break LOCA calculations forPVNGSUnits 1,2,and3 for CY2020. Additionally, because PCTis notcalculated aspartofthepost-LOCA long-term cooling (LTC) analysis,there are nochanges orerrors intheLTCmodels that affect PCT.

Theenclosure provides a moredetailed discussion oftheabsolute PCTeffects inthe evaluation models forpressurized waterreactors ECCSperformance analyses inCY 2020forPVNGS.

A member of the STARS Alliance LLC Callaway

  • Diablo Canyon Palo Verde Wolf Creek

102-08264-MDD/MSC ATTN:Document Control Desk U.S.Nuclear Regulatory Commission ECCS Performance Models, Evaluation 10CFR50.46(a)(3)(ii) Annual Reportfor2020 Page 2 No commitments arebeingmadetotheNRCbythis letter.

Should youneedfurther information regarding this submittal, please contact, Matthew S.Cox,Licensing Section Leader, at(623)393-5753.

Sincerely, byDilorenzo, Michael i, i Dita9Hy3;;gned DN:cn=Dilorenzo,Michael D(z99838)

Date: 2021.04.16 16:16:16 -07'00' Michael D.DiLorenzo Nuclear Regulatory Affairs Department Leader MDD/MSC/CJS

Enclosure:

SummaryofCumulative Effects onCalculated PeakClad Temperature(PCT) forPVNGS Due toChanges/Errors in EmergencyCoreCooling System (ECCS) Performance Evaluation Models cc:

S.A.Morris NRCRegion IVRegional Administrator S.P.Lingam NRCNRRProject Manager for PVNGS C.A.Peabody NRCSenior ResidentInspector for PVNGS

Enclosure Summary ofCumulative Effects on Calculated PeakClad (PCT)

Temperature forPVNGSDue to Changes/Errors in EmergencyCoreCooling System(ECCS) Performance Evaluation Models

Enclosure SummaryofCumulative Effects on Calculated PCTforPVNGS Due toChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit1 LargeBreakLossofCoolant Accident (LBLOCA)

PeakCladding Temperature (PCT) Summary Sheet Westinghouse CE16STD and CE16NGF FuelAssemblies Utility Name: Arizona PublicService Company (APS)

PlantName: Palo Verde Nuclear Generating Unit Station, 1 CalendarYear(CY) 2020 OperatingCycle(s) Cycles 22 and23 FuelType(s) Westinghouse CE16STD andCE16NGF EvaluationModel(EM): Westinghouse 1999EM EM

Description:

Appendix K Large Break PCT Reference(s) Note(s)

AnalysisofRecord(AOR) 2130 F 1,2 1 PCT Effect PCT t Reference(s) Note(s)

Assessments A. Cumulative 10CFR50.46 Changes and + 0 0F + 0 0F 3 -----

ErrorCorrections-PreviouslyReported B. 10CFR50.46 Changes andError + 0 0F + 0 0F ----- -----

Corrections-NewforCY2020 C.Absolute SumofCumulative 10CFR -----

+ 0 0F ----- -----

50.46 Changes andError Corrections AOR+ Assessments PCT= 21300F ThesumofthePCTfromthemost recent AORusing an acceptable evaluation model, andthe estimated cumulative effects ofchanges anderror corrections made since that AOR, remains less than the10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Westinghouse CN-TLA-14-016, Revision 2,"Palo Verde Units1,2 and3 LBLOCA Bounding ECCS Performance Analysis forNGFTransition," May 12,2017.
2. Westinghouse WCAP-18076-P, Revision 1,"Reload Transition SafetyReport forPalo VerdeNuclear Generating StationUnits 1,2 and3 with Combustion Engineering16x16NextGeneration Fuel,"June30, 2016.
3. APSLetter toNRC,102-08095-MDD/MSC, "Palo VerdeNuclear Generating Station Units 1,2,and3; LicenseNos. NPF-41, NPF-51, andNPF-74; Docket Nos. STN50-528, 50-529, and50-530; Emergency CoreCooling SystemPerformance Evaluation Models, 10CFR50.46(a)(3)(ii) Annual for2019,"

Report 16,2020.[NRC April ADAMSAccession No.ML20107J564.)

Notes

1. Palo Verde Unit1 beganCY2020inoperating cycle 22,that unit'sfirst fuel design transition cycle with 141Westinghouse standard (CE16STD) assemblies and100Westinghouse NextGeneration Fuel (CE16NGF) assemblies. Theunit ended theCYinoperating cycle23,itssecond fuel design transition cyclewith41 Westinghouse CE16STD assemblies and200Westinghouse CE16NGF assemblies. ThePCT reportedabove(2130 0F) isbounding for bothfuel types andforbothoperating cycles.

1

Enclosure SummaryofCumulative Effects on Calculated PCTforPVNGS Due toChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit2 LargeBreakLossofCoolant Accident (LBLOCA)

PeakCladding Temperature (PCT) Summary Sheet Westinghouse CE16STD FuelAssemblies Utility Name: Arizona Public Service Company (APS)

PlantName: Palo Verde Nuclear Generating Station,Unit 2 CalendarYear(CY) 2020 OperatingCycle(s) Cycles 22 and23 FuelType(s) Westinghouse CE16STD EvaluationModel(EM): Westinghouse 1999EM EM

Description:

Appendix K Large Break PCT Reference(s) Note(s)

AnalysisofRecord(AOR) 21060F 1,2 1 PCT Effect PCT t Reference(s) Note(s)

Assessments A. Cumulative 10CFR50.46 Changes and + 0 0F + 0 0F 3 -----

Corrections Error -

Previously Reported B. 10CFR50.46 Changes andError + 0 0F + 0 0F ----- -----

Corrections NewforCY2020 C.Absolute SumofCumulative 10CFR -----

+ 0 0F ----- -----

50.46Changes andErrorCorrections AOR+ Assessments PCT= 21060F ThesumofthePCTfromthemost recent AORusing an acceptable evaluation model, andthe estimated cumulative effects ofchanges anderror corrections made sincethat AOR, remains less thanthe10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Westinghouse CN-LAM-09-33,Revision 0,"LBLOCA ECCSPerformance Analysis for Palo VerdeUnits 1,2, and3 forRSGandSHAImplementation," August 31,2009.
2. Westinghouse "Analysis CVER-09-62, ofRecord forLarge BreakLOCAECCSPerformance Analysis Including Replacement SteamGenerators andSimplified HeadImplementation forPVNGSUnits 1,2,and 3,"August31,2009.
3. APSLetter toNRC,102-08095-MDD/MSC, "Palo Verde Nuclear Generating Station Units 1,2,and3; LicenseNos.NPF-41, andNPF-74; NPF-51, Docket Nos.STN50-528, 50-529, and50-530; Emergency CoreCooling System Performance Evaluation Models, 10CFR50.46(a)(3)(ii) Annual for2019,"

Report 16,2020.[NRC April ADAMSAccession No.ML20107J564.)

Notes

1. Palo VerdeUnit 2 beganCY2020inoperating cycle 22 witha full core of241Westinghouse standard (CE16STD) assemblies.

Theunit endedtheCYinoperating cycle23,that unit's first fuel design transition cyclewith141Westinghouse CE16STD assemblies and100Framatome CE16HTP assemblies. ThePCT reportedabove (2106 0F) isbounding for both operating cyclesfor Westinghouse CE16STD fuel only. The PCTforFramatome CE16HTPfuel isaddressed ona separate summarysheet.

2

Enclosure SummaryofCumulative Effects on Calculated PCTforPVNGS Due toChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit2 LargeBreakLossofCoolant Accident (LBLOCA)

PeakCladding Temperature (PCT) Summary Sheet Framatome CE16HTP FuelAssemblies Utility Name: Arizona Public Service Company (APS)

PlantName: Palo Verde Nuclear Generating Station,Unit 2 CalendarYear(CY) 2020 Operating Cycle(s) Cycle 23 FuelType(s) Framatome CE16HTP EvaluationModel(EM): EMF-2103 Revision 3 EM

Description:

Realistic Large Break PCT Reference(s) Note(s)

AnalysisofRecord(AOR) 17520F 1,2,3 1 PCT Effect PCT t Reference(s) Note(s)

Assessments A. Cumulative 10CFR50.46 Changes and + 0 0F + 0 0F 3 -----

ErrorCorrections -

Previously Reported B. 10CFR50.46 Changes andError Corrections NewforCY2020

1. Framatome CR2020-0441; + 0 0F + 0 0F 4 -----

Radiation Enclosure InputError

2. Framatome CR2020-1165; + 0 0F +0 0F 5 -----

RadialPower Distribution Maps C. AbsoluteSumofCumulative 10CFR -----

+O F ----- -----

50.46Changes andError Corrections AOR + Assessments PCT= 1752 F ThesumofthePCTfromthemostrecent AOR using an acceptable evaluationmodel, andtheestimated cumulative effects ofchanges anderror madesince that AOR, corrections remains less thanthe10CFR50.46(b)(1) regulatory limit of 22000F.

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,and3 Realistic LargeBreak LOCASummary Report;Licensing May 2018.

Report,"

3. Framatome ANP-3639P, Revision 1Q1P,Revision 0,"Palo VerdeUnits 1,2,and3 Realistic Large Break LOCASummaryReport; NRCRAIResponses; Licensing Report,"September 2019.Includes theeffects of Framatome CRs2019-840 and2019-1130, that predate NRCstaff approval ofFramatome CE16HTP implementation atPalo Verde.[The NRCSafety Evaluation atNRCADAMSAccession No.ML20031C947 referencesanAPSletter toNRCatNRCADAMS Accession No.ML19277J457, which addressed these CRs.)
4. Framatome Letter toAPS,FS1-0050663-1.0, "Evaluation ofCondition Report 2020-0441 forPotential ReportingUnder 10CFR50.46 for Palo Verde," June3,2020.
5. Framatome Letter toAPS,FS1-0051812-1.0, "Evaluation ofCondition Report 2020-1165 forPotential ReportingUnder10CFR50.46 forPalo Verde," August 14,2020.

Notes

1. Palo Verde Unit 2 beganCY2020inoperating cycle 22with a full core of241Westinghouse standard (CE16STD) assemblies. Theunit ended theCYinoperating cycle23,that unit's first fuel design transition cyclewith141Westinghouse CE16STD assemblies and100Framatome CE16HTP assemblies. ThePCT reportedabove(1752 0F)isbounding forFramatome CE16HTP fuelonly. ThePCTfor Westinghouse CE16STD fuel isaddressed ona separate summary sheet.

3

Enclosure SummaryofCumulative Effects on Calculated PCTforPVNGS Due toChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit3 LargeBreakLossofCoolant Accident (LBLOCA)

PeakCladding Temperature (PCT) Summary Sheet Westinghouse CE16STD and CE16NGF FuelAssemblies Utility Name: Arizona Public Service Company (APS)

PlantName: Palo Verde Nuclear Generating Station,Unit 3 CalendarYear(CY) 2020 OperatingCycle(s) Cycle 22 FuelType(s) Westinghouse CE16STD andCE16NGF EvaluationModel(EM): Westinghouse 1999EM EM

Description:

Appendix K Large Break PCT Reference(s) Note(s)

AnalysisofRecord(AOR) 21300F 1,2 1 PCT Effect PCT t Reference(s) Note(s)

Assessments A. Cumulative 10CFR50.46 Changes and + 0 0F + 0 0F 3 -----

Corrections Error -

PreviouslyReported B. 10CFR50.46 Changes andError + 0 0F + 0 0F ----- -----

Corrections NewforCY2020 C.Absolute SumofCumulative 10CFR -----

+ 0 0F ----- -----

50.46Changes andError Corrections AOR+ Assessments PCT= 21300F ThesumofthePCTfromthemost recent AORusing an acceptable evaluation model, andthe estimated cumulative effects ofchanges anderror corrections made sincethat AOR, remains less than the10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Westinghouse CN-TLA-14-016, Revision 2,"Palo Verde 1,2 and3 LBLOCA Units Bounding ECCS Performance AnalysisforNGFTransition," May 12,2017.
2. Westinghouse WCAP-18076-P, Revision 1,"Reload Transition SafetyReport forPalo VerdeNuclear Generating StationUnits1,2 and3 with Combustion 16x16NextGeneration Engineering Fuel," June30, 2016.
3. APSLetter toNRC,102-08095-MDD/MSC, "Palo Verde NuclearGenerating Station Units 1,2,and3; LicenseNos.NPF-41, NPF-51, andNPF-74; Docket Nos.STN50-528, 50-529, and50-530; Emergency CoreCooling System Performance Evaluation Models, 10CFR50.46(a)(3)(ii) Annual Reportfor2019,"

16,2020.[NRC April ADAMSAccession No.ML20107J564.)

Notes

1. Palo VerdeUnit 3 beganandendedCY2020inoperating 22,that cycle unit's first fuel designtransition cyclewith141Westinghouse standard (CE16STD) assemblies and100Westinghouse NextGeneration Fuel (CE16NGF) assemblies.ThePCTreported above(2130 F)isbounding forbothfuel typesforthat cycle.

operating 4

Enclosure SummaryofCumulative Effects on Calculated PCTforPVNGS Due toChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit1 SmallBreakLossofCoolant Accident (SBLOCA)

PeakCladding Temperature (PCT) Summary Sheet Westinghouse CE16STD and CE16NGF FuelAssemblies Utility Name: Arizona Public Service Company (APS)

PlantName: Palo Verde Nuclear Generating Station,Unit 1 CalendarYear(CY) 2020 OperatingCycle(s) Cycles 22 and23 FuelType(s) Westinghouse CE16STD andCE16NGF EvaluationModel(EM): Westinghouse S2M EM

Description:

Appendix K Small Break PCT Reference(s) Note(s)

AnalysisofRecord(AOR) 16780F 1,2 1 PCT Effect PCT t Reference(s) Note(s)

Assessments A. Cumulative10CFR50.46 Changes and + 0 0F + 0 0F 3 -----

Corrections Error -

PreviouslyReported B. 10CFR50.46 Changes andError + 0 0F + 0 0F ----- -----

Corrections NewforCY2020 C.Absolute SumofCumulative 10CFR -----

+ 0 0F ----- -----

50.46ChangesandError Corrections AOR+ Assessments PCT= 16780F ThesumofthePCTfromthemost recent AORusing an acceptable evaluationmodel, andthe estimated cumulative effects ofchanges anderror corrections made sincethat AOR, remains less than the10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Westinghouse CN-TLA-14-020, Revision 1,"Palo Verde Units1,2 and3 SBLOCA Bounding ECCS PerformanceAnalysisforNGFTransition," January 7,2016.
2. Westinghouse WCAP-18076-P, Revision 1,"Reload Transition Safety Report forPalo VerdeNuclear GeneratingStationUnits1,2 and3 with Combustion Engineering16x16NextGeneration Fuel," June30, 2016.
3. APSLettertoNRC,102-08095-MDD/MSC, "Palo Verde Nuclear Generating Station Units 1,2,and3; License Nos.NPF-41, NPF-51,andNPF-74; Docket Nos.STN50-528, 50-529, and50-530; Emergency CoreCoolingSystem Performance Evaluation Models, 10CFR50.46(a)(3)(ii) Annual Reportfor2019,"

16,2020.[NRC April ADAMSAccession No.ML20107J564.)

Notes

1. Palo VerdeUnit1 beganCY2020inoperating cycle 22,that unit'sfirst fuel design transition cycle with 141Westinghouse standard (CE16STD) assemblies and100Westinghouse NextGeneration Fuel (CE16NGF) assemblies.Theunit endedtheCYinoperating cycle23,its second fuel designtransition cyclewith 41 Westinghouse CE16STD assemblies and200Westinghouse CE16NGF assemblies. ThePCT reported above(1678 0F)isbounding forbothfuel types andforbothoperating cycles.

5

Enclosure SummaryofCumulative Effects on Calculated PCTforPVNGS Due toChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit2 SmallBreakLossofCoolant Accident(SBLOCA)

PeakCladding Temperature (PCT) Summary Sheet Westinghouse CE16STD FuelAssemblies Utility Name: Arizona Public Service Company (APS)

PlantName: Palo Verde Nuclear Generating Station,Unit 2 CalendarYear(CY) 2020 OperatingCycle(s) Cycles 22 and23 FuelType(s) Westinghouse CE16STD EvaluationModel(EM): Westinghouse S2M EM

Description:

Appendix K Small Break PCT Reference(s) Note(s)

AnalysisofRecord(AOR) 16180F 1 1 PCT Effect PCT t Reference(s) Note(s)

Assessments A. Cumulative 10CFR50.46 Changes and + 0 0F + 0 0F 2 -----

Corrections Error -

Previously Reported B. 10CFR50.46 Changes andError + 0 0F + 0 0F ----- -----

Corrections NewforCY2020 C.Absolute SumofCumulative 10CFR -----

+ 0 0F ----- -----

50.46Changes andErrorCorrections AOR+ Assessments PCT= 16180F ThesumofthePCTfromthemost recent AORusing an acceptable evaluation model, andthe estimated cumulative effects ofchanges anderror corrections made sincethat AOR, remains less the10CFR50.46(b)(1) regulatory limit than of 22000F.

References

1. Westinghouse A-PV-FE-0149, Revision 1,"Palo Verde 1,2 and3 S2MBounding Units SBLOCAECCS Performance Analysis,"

March22,2002.

2. APSLetter toNRC,102-08095-MDD/MSC, "Palo VerdeNuclear Generating Station Units 1,2,and3; LicenseNos.NPF-41, andNPF-74; NPF-51, Docket Nos.STN50-528, 50-529, and50-530; Emergency CoreCooling System Performance Evaluation Models, 10CFR50.46(a)(3)(ii) Annual Reportfor2019,"

16,2020.[NRC April ADAMSAccession No.ML20107J564.)

Notes

1. Palo VerdeUnit 2 beganCY2020inoperating cycle 22with afullcore of241Westinghouse standard (CE16STD) assemblies.

Theunit ended theCYinoperating cycle23,that unit's first fueldesigntransition cyclewith141Westinghouse CE16STD assemblies and100Framatome CE16HTP assemblies. ThePCT reportedabove(1618 F)isbounding forboth operating for cycles Westinghouse CE16STD fuel only. The PCTfor Framatome CE16HTPfuel isaddressed ona separate summarysheet.

6

Enclosure SummaryofCumulative Effects on Calculated PCTforPVNGS Due toChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit2 SmallBreakLossofCoolant Accident (SBLOCA)

PeakCladding Temperature (PCT) Summary Sheet Framatome CE16HTP FuelAssemblies Utility Name: Arizona PublicService Company (APS)

PlantName: Palo Verde Nuclear Generating Station,Unit 2 CalendarYear(CY) 2020 OperatingCycle(s) Cycle 23 FuelType(s) Framatome CE16HTP EvaluationModel(EM): EMF-2328 Revision 0andSupplement 1 Revision 0 EM

Description:

Appendix K Small Break PCT Reference(s) Note(s)

AnalysisofRecord(AOR) 16200F 1,2,3 1 PCT Effect PCT t Reference(s) Note(s)

Assessments A. Cumulative 10CFR50.46 Changes and + 0 0F + 0 0F 3 -----

Corrections Error -

Previously Reported B. 10CFR50.46 Changes andError + 0 0F + 0 0F ----- -----

Corrections NewforCY2020 C.Absolute SumofCumulative 10CFR -----

+ 0 0F ----- -----

50.46Changes andErrorCorrections AOR+ Assessments PCT= 16200F ThesumofthePCTfromthemost recent AORusing an acceptable evaluation model, andthe estimated cumulative effects ofchanges anderror corrections made sincethat AOR, remains less thanthe10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Framatome 32-9268122, Revision0,"Palo Verde VQP SBLOCA Transient Analyses," January18, 2018.
2. Framatome ANP-3640P, Revision0,"Palo VerdeUnits 1,2,and3 Small Break LOCASummaryReport; Report,"

Licensing March2018.

3. Framatome ANP-3640Q1P, Revision 0,"Palo Verde Units 1,2,and3 Small Break LOCASummaryReport; NRCRAIResponses; Report,"

Licensing September 2019.

Notes

1. Palo VerdeUnit 2 beganCY2020inoperating cycle 22 with a full core of241Westinghouse standard (CE16STD) assemblies. Theunit ended theCYinoperating cycle23,that unit's first design fuel transition cyclewith141Westinghouse CE16STD assemblies and100Framatome CE16HTP assemblies. ThePCT above(1620 reported F)isbounding forFramatome CE16HTP fuelonly. ThePCTforWestinghouse CE16STD fuel isaddressedona separate summary sheet.

7

Enclosure SummaryofCumulative Effects on Calculated PCTforPVNGS Due toChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit3 SmallBreakLossofCoolant Accident (SBLOCA)

PeakCladding Temperature (PCT) Summary Sheet Westinghouse CE16STD and CE16NGF FuelAssemblies Utility Name: Arizona Public Service Company (APS)

PlantName: Palo Verde Nuclear Generating Station,Unit 3 CalendarYear(CY) 2020 OperatingCycle(s) Cycle 22 FuelType(s) Westinghouse CE16STD andCE16NGF EvaluationModel(EM): Westinghouse S2M EM

Description:

Appendix K Small Break PCT Reference(s) Note(s)

AnalysisofRecord(AOR) 16780F 1,2 1 PCT Effect PCT t Reference(s) Note(s)

Assessments A.Cumulative10CFR50.46 Changes and + 0 0F + 0 0F 3 -----

ErrorCorrections-Previously Reported B. 10CFR50.46 Changes andError +0 F +0 F --- ----

Corrections NewforCY2020 C. AbsoluteSumofCumulative 10CFR -----

+ 0 F ----- -----

50.46Changes andError Corrections AOR + Assessments PCT= 1678 F ThesumofthePCTfromthemost recent AORusing an acceptable evaluation model, andthe estimated cumulative effects ofchanges anderror corrections made since that AOR, remains less thanthe10CFR50.46(b)(1) regulatory limit of 2200 F.

References

1. Westinghouse CN-TLA-14-020, Revision 1,"Palo VerdeUnits 1,2 and3 SBLOCA Bounding ECCS Performance Analysis forNGFTransition," January 7,2016.
2. Westinghouse WCAP-18076-P, Revision 1,"Reload TransitionSafety Report forPalo Verde Nuclear Generating Station 1,2 and3with Units Combustion Engineering16x16NextGeneration Fuel,"June30, 2016.
3. APSLetter toNRC,102-08095-MDD/MSC, "Palo VerdeNuclear Generating Station Units 1,2,and3; LicenseNos.NPF-41, NPF-51,andNPF-74; Docket Nos.STN50-528, 50-529, and50-530; Emergency CoreCooling SystemPerformance Evaluation Models, 10CFR50.46(a)(3)(ii) Annual Report for2019,"

April 16,2020.[NRC ADAMS Accession No.ML20107J564.)

Notes

1. Palo VerdeUnit 3 beganandendedCY2020inoperating cycle22,that unit'sfirstfuel design transition cyclewith141Westinghouse standard (CE16STD) assemblies and100Westinghouse NextGeneration Fuel (CE16NGF) assemblies. ThePCTreported above (1678 0F)isbounding for both fuel typesforthat cycle.

operating 8

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