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)
v • d • e


Text

10CFR50.46(a)(3)(ii PaloVerde Nuclear Generating 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 Units1,2,and3 License Nos.NPF-41,NPF-51 and NPF-74 DocketNos.STN50-528,50-529, 50-530 EmergencyCoreCooling System Performance Evaluation Models,10CFR50.46(a)(3)(ii)

Annual Report for2020 Pursuant to10CFR50.46(a)(3)(ii),

ArizonaPublic Service Company (APS) is providing asummaryofthecumulative effects oncalculated peak cladding temperature (PCT) forthePaloVerdeNuclear Generating Station (PVNGS) dueto changes orerrors inemergency corecooling systemperformance evaluation models (EM).

Duringcalendar year(CY) 2020therewerenonewchanges to,orerrors discovered in,theWestinghouse large breaklossofcoolant accident (LBLOCA)

1999EM, which isa 10CFRPart50,Appendix K,EM.Thereweretwominorerrors discovered in the application oftheFramatomeLBLOCAEMF-2103, Revision 3,EMforUnit2,which is a realistic (or bestestimate plusuncertainty)

EM.However, thecumulative sumof theabsolute magnitudes ofAPCTassessments, forallchangesanderrors identified sinceperformance oftheWestinghouse andFramatomeLBLOCAanalyses was0 0F throughout CY2020forallthree PVNGSunits.

Therewerenochangesorerrors thataffected PCTinthesmallbreakLOCA calculations forPVNGSUnits1,2,and3forCY2020.Additionally, because PCTis notcalculated aspartofthepost-LOCA long-term cooling (LTC)

analysis, there are nochangesorerrors intheLTCmodelsthataffect PCT.

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

A member of the STARS AllianceLLC Callaway

  • DiabloCanyon Palo Verde Wolf Creek

102-08264-MDD/MSC ATTN:DocumentControl Desk U.S.Nuclear Regulatory Commission ECCS Performance Evaluation

Models, 10CFR50.46(a)(3)(ii)

AnnualReport for2020 Page 2 Nocommitments arebeingmadetotheNRCbythisletter.

Should youneedfurther information regarding thissubmittal, please

contact, MatthewS.Cox,Licensing Section
Leader, at(623)393-5753.

Sincerely, i,

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

Date:

2021.04.16 16:16:16

-07'00' Michael D.DiLorenzo Nuclear Regulatory Affairs DepartmentLeader 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 NRCRegionIVRegional Administrator S.P.Lingam NRCNRRProject Manager forPVNGS C.A.Peabody NRCSenior Resident Inspector for PVNGS

Enclosure SummaryofCumulative Effectson Calculated PeakClad Temperature(PCT) forPVNGSDue to Changes/Errors in EmergencyCoreCooling System(ECCS)

Performance Evaluation Models

Enclosure SummaryofCumulative Effects onCalculated PCTforPVNGS DuetoChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit1 LargeBreakLossofCoolantAccident(LBLOCA)

PeakCladding Temperature(PCT)

Summary Sheet Westinghouse CE16STDandCE16NGFFuelAssemblies Utility Name:

Arizona Public Service Company(APS)

PlantName:

PaloVerdeNuclear Generating

Station, Unit1 Calendar Year(CY) 2020 Operating Cycle(s)

Cycles 22and23 FuelType(s)

Westinghouse CE16STDandCE16NGF Evaluation Model(EM):

Westinghouse 1999EM EMDescription:

Appendix K LargeBreak PCT Reference(s)

Note(s)

Analysis ofRecord(AOR) 2130 F 1,2 1

Reference(s)

Note(s)

PCT Effect PCT t

Assessments A. Cumulative 10CFR50.46Changesand

+ 0 0F

+0 0F 3

Error Corrections

- Previously Reported B. 10CFR50.46ChangesandError

+ 00F

+ 00F Corrections

- NewforCY2020 C.Absolute SumofCumulative 10CFR

+ 00F 50.46ChangesandErrorCorrections AOR+ Assessments PCT= 21300F ThesumofthePCTfromthemost recent AORusingan acceptable evaluation model,andthe estimated cumulative effects ofchanges anderror corrections made since

thatAOR, remains less thanthe10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Westinghouse CN-TLA-14-016, Revision 2,"Palo VerdeUnits 1,2and3LBLOCABounding ECCS Performance Analysis forNGFTransition,"

May12,2017.

2. Westinghouse WCAP-18076-P, Revision 1,"Reload Transition Safety Report forPaloVerdeNuclear Generating Station Units 1,2 and3withCombustion Engineering 16x16NextGeneration Fuel,"
June30, 2016.
3. APSLetter toNRC,102-08095-MDD/MSC, "Palo VerdeNuclear Generating Station Units1,2,and3; License Nos.NPF-41, NPF-51, andNPF-74;DocketNos.STN50-528, 50-529, and50-530;Emergency CoreCooling SystemPerformance Evaluation
Models, 10CFR50.46(a)(3)(ii)

AnnualReportfor2019,"

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

Notes

1. PaloVerdeUnit1beganCY2020inoperating cycle 22,thatunit's first fueldesign transition cyclewith 141Westinghouse standard (CE16STD) assemblies and100Westinghouse NextGeneration Fuel (CE16NGF) assemblies.

TheunitendedtheCYinoperating cycle 23,itssecond fuel design transition cycle with41Westinghouse CE16STDassemblies and200Westinghouse CE16NGFassemblies.

ThePCT reported above(2130 0F) isbounding forbothfuel typesandforbothoperating cycles.

1

Enclosure SummaryofCumulative Effects onCalculated PCTforPVNGS DuetoChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit2 LargeBreakLossofCoolantAccident(LBLOCA)

PeakCladding Temperature(PCT)

Summary Sheet Westinghouse CE16STDFuelAssemblies Utility Name:

Arizona Public Service Company(APS)

PlantName:

PaloVerdeNuclear Generating

Station, Unit2 Calendar Year(CY) 2020 Operating Cycle(s)

Cycles 22and23 FuelType(s)

Westinghouse CE16STD Evaluation Model(EM):

Westinghouse 1999EM EMDescription:

Appendix K LargeBreak PCT Reference(s)

Note(s)

Analysis ofRecord(AOR) 21060F 1,2 1

Reference(s)

Note(s)

PCT Effect PCT t

Assessments A. Cumulative 10CFR50.46Changes and

+ 0 0F

+ 00F 3

ErrorCorrections

- Previously Reported B. 10CFR50.46Changes andError

+ 00F

+ 0 0F Corrections

- NewforCY2020 C.Absolute SumofCumulative 10CFR

+ 0 0F 50.46ChangesandError Corrections AOR+Assessments PCT= 21060F ThesumofthePCTfromthemost recent AORusingan acceptable evaluation model,andthe estimated cumulative effects ofchanges anderror corrections made since

thatAOR, remains less thanthe10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Westinghouse CN-LAM-09-33, Revision 0,"LBLOCAECCSPerformance Analysis forPaloVerdeUnits 1,2, and3forRSGandSHAImplementation,"

August31,2009.

2. Westinghouse CVER-09-62, "Analysis ofRecordforLargeBreakLOCAECCSPerformance Analysis Including Replacement SteamGenerators andSimplified HeadImplementation forPVNGSUnits1,2,and 3,"August31,2009.
3. APSLetter toNRC,102-08095-MDD/MSC, "Palo VerdeNuclear Generating Station Units 1,2,and3; License Nos.NPF-41,NPF-51,andNPF-74;DocketNos.STN50-528,50-529,and50-530;Emergency CoreCooling SystemPerformance Evaluation
Models, 10CFR50.46(a)(3)(ii)

AnnualReport for2019,"

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

Notes

1. PaloVerdeUnit2 beganCY2020inoperating cycle22withafull coreof241Westinghouse standard (CE16STD) assemblies.

TheunitendedtheCYinoperating cycle 23,thatunit's first fueldesign transition cyclewith141Westinghouse CE16STDassemblies and100Framatome CE16HTPassemblies.

ThePCT reported above(2106 0F) isbounding forbothoperating cycles forWestinghouse CE16STDfuel only.The PCTforFramatomeCE16HTPfuelisaddressed onaseparate summarysheet.

2

Enclosure SummaryofCumulative Effects onCalculated PCTforPVNGS DuetoChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit2 LargeBreakLossofCoolantAccident(LBLOCA)

PeakCladding Temperature(PCT)

Summary Sheet FramatomeCE16HTPFuelAssemblies Utility Name:

Arizona Public Service Company(APS)

PlantName:

PaloVerdeNuclear Generating

Station, Unit2 Calendar Year(CY) 2020 Operating Cycle(s)

Cycle23 FuelType(s)

Framatome CE16HTP Evaluation Model(EM):

EMF-2103 Revision 3

EMDescription:

Realistic LargeBreak PCT Reference(s)

Note(s)

Analysis ofRecord(AOR) 17520F 1,2,3 1

Reference(s)

Note(s)

PCT Effect PCT t

Assessments A. Cumulative 10CFR50.46Changes and

+ 0 0F

+ 00F 3

ErrorCorrections

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

- NewforCY2020 1.Framatome CR2020-0441;

+ 00F

+ 0 0F 4

Radiation Enclosure InputError

2. FramatomeCR2020-1165;

+ 0 0F

+ 0 0F 5

Radial PowerDistribution Maps C.Absolute SumofCumulative 10CFR

+ O F 50.46ChangesandError Corrections AOR+Assessments PCT= 1752 F ThesumofthePCTfromthemostrecent AOR using an acceptable evaluation model,andtheestimated cumulative effects ofchanges anderror corrections madesince that AOR, remainslessthanthe10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Framatome 32-9268125, Revision 0,"Palo VerdeVQPRealistic LargeBreakLOCA(RLBLOCA)

Uncertainty Analysis,"

February 21,2018.

2. Framatome ANP-3639P, Revision 1,"Palo VerdeUnits 1,2,and3Realistic LargeBreakLOCASummary Report; Licensing Report,"

May2018.

3. Framatome ANP-3639P, Revision 1Q1P,Revision 0,"PaloVerdeUnits1,2,and3Realistic LargeBreak LOCASummaryReport; NRCRAIResponses; Licensing Report,"

September 2019.Includes theeffects of FramatomeCRs2019-840 and2019-1130, thatpredate NRCstaff approval ofFramatomeCE16HTP implementation atPaloVerde.[The NRCSafetyEvaluation atNRCADAMSAccession No.ML20031C947 references anAPSletter toNRCatNRCADAMSAccession No.ML19277J457, whichaddressed theseCRs.)

4. FramatomeLetter toAPS,FS1-0050663-1.0, "Evaluation ofCondition Report2020-0441 forPotential Reporting Under10CFR50.46forPaloVerde,"

June3,2020.

5. FramatomeLetter toAPS,FS1-0051812-1.0, "Evaluation ofCondition Report2020-1165 forPotential Reporting Under10CFR50.46forPaloVerde,"

August14,2020.

Notes

1. PaloVerdeUnit2beganCY2020inoperating cycle 22withafull coreof241Westinghouse standard (CE16STD) assemblies.

TheunitendedtheCYinoperating cycle 23,thatunit's first fueldesign transition cycle with141Westinghouse CE16STDassemblies and100Framatome CE16HTPassemblies.

ThePCT reported above(1752 0F) isbounding forFramatomeCE16HTPfuelonly.ThePCTforWestinghouse CE16STDfuelisaddressed onaseparate summarysheet.

3

Enclosure SummaryofCumulative Effects onCalculated PCTforPVNGS DuetoChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit3 LargeBreakLossofCoolantAccident(LBLOCA)

PeakCladding Temperature(PCT)

Summary Sheet Westinghouse CE16STDandCE16NGFFuelAssemblies Utility Name:

Arizona Public Service Company(APS)

PlantName:

PaloVerdeNuclear Generating

Station, Unit3 Calendar Year(CY) 2020 Operating Cycle(s)

Cycle22 FuelType(s)

Westinghouse CE16STDandCE16NGF Evaluation Model(EM):

Westinghouse 1999EM EMDescription:

Appendix K LargeBreak PCT Reference(s)

Note(s)

Analysis ofRecord(AOR) 21300F 1,2 1

Reference(s)

Note(s)

PCT Effect PCT t

Assessments A. Cumulative 10CFR50.46Changes and

+ 0 0F

+ 00F 3

ErrorCorrections

- Previously Reported B. 10CFR50.46Changes andError

+ 00F

+ 0 0F Corrections

- NewforCY2020 C.Absolute SumofCumulative 10CFR

+ 0 0F 50.46ChangesandError Corrections AOR+Assessments PCT= 21300F ThesumofthePCTfromthemost recent AORusingan acceptable evaluation model,andthe estimated cumulative effects ofchanges anderror corrections made since

thatAOR, remains less thanthe10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Westinghouse CN-TLA-14-016, Revision 2,"Palo VerdeUnits1,2and3LBLOCABounding ECCS Performance Analysis forNGFTransition,"

May12,2017.

2. Westinghouse WCAP-18076-P, Revision 1,"Reload Transition Safety Report forPaloVerdeNuclear Generating Station Units1,2 and3withCombustion Engineering 16x16NextGeneration Fuel,"
June30, 2016.
3. APSLetter toNRC,102-08095-MDD/MSC, "Palo VerdeNuclear Generating Station Units 1,2,and3; License Nos.NPF-41,NPF-51,andNPF-74;DocketNos.STN50-528,50-529,and50-530;Emergency CoreCooling SystemPerformance Evaluation
Models, 10CFR50.46(a)(3)(ii)

AnnualReport for2019,"

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

Notes

1. PaloVerdeUnit3beganandendedCY2020inoperating cycle22,thatunit's first fuel design transition cycle with141Westinghouse standard (CE16STD) assemblies and100Westinghouse NextGeneration Fuel (CE16NGF) assemblies.

ThePCTreported above(2130F)isbounding forbothfueltypesforthat operating cycle.

4

Enclosure SummaryofCumulative Effects onCalculated PCTforPVNGS DuetoChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit1 SmallBreakLossofCoolantAccident(SBLOCA)

PeakCladding Temperature(PCT)

Summary Sheet Westinghouse CE16STDandCE16NGFFuelAssemblies Utility Name:

Arizona Public Service Company(APS)

PlantName:

PaloVerdeNuclear Generating

Station, Unit1 Calendar Year(CY) 2020 Operating Cycle(s)

Cycles 22and23 FuelType(s)

Westinghouse CE16STDandCE16NGF Evaluation Model(EM):

Westinghouse S2M EMDescription:

Appendix KSmallBreak PCT Reference(s)

Note(s)

Analysis ofRecord(AOR) 16780F 1,2 1

Reference(s)

Note(s)

PCT Effect PCT t

Assessments A. Cumulative 10CFR50.46Changes and

+ 0 0F

+ 00F 3

ErrorCorrections

- Previously Reported B. 10CFR50.46Changes andError

+ 00F

+ 0 0F Corrections

- NewforCY2020 C.Absolute SumofCumulative 10CFR

+ 0 0F 50.46ChangesandError Corrections AOR+Assessments PCT= 16780F ThesumofthePCTfromthemost recent AORusingan acceptable evaluation model,andthe estimated cumulative effects ofchanges anderror corrections made since

thatAOR, remains less thanthe10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Westinghouse CN-TLA-14-020, Revision 1,"Palo VerdeUnits1,2and3SBLOCABounding ECCS Performance Analysis forNGFTransition,"

January 7,2016.

2. Westinghouse WCAP-18076-P, Revision 1,"Reload Transition Safety Report forPaloVerdeNuclear Generating Station Units1,2 and3withCombustion Engineering 16x16NextGeneration Fuel,"
June30, 2016.
3. APSLetter toNRC,102-08095-MDD/MSC, "Palo VerdeNuclear Generating Station Units1,2,and3; License Nos.NPF-41,NPF-51,andNPF-74;DocketNos.STN50-528,50-529,and50-530;Emergency CoreCooling SystemPerformance Evaluation
Models, 10CFR50.46(a)(3)(ii)

AnnualReport for2019,"

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

Notes

1. PaloVerdeUnit1beganCY2020inoperating cycle22,thatunit's first fuel designtransition cyclewith 141Westinghouse standard (CE16STD) assemblies and100Westinghouse NextGeneration Fuel (CE16NGF) assemblies.

TheunitendedtheCYinoperating cycle23,itssecondfueldesign transition cycle with41Westinghouse CE16STDassemblies and200Westinghouse CE16NGFassemblies.

ThePCT reported above(1678 0F)isbounding forbothfueltypesandforbothoperating cycles.

5

Enclosure SummaryofCumulative Effects onCalculated PCTforPVNGS DuetoChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit2 SmallBreakLossofCoolantAccident(SBLOCA)

PeakCladding Temperature(PCT)

Summary Sheet Westinghouse CE16STDFuelAssemblies Utility Name:

Arizona Public Service Company(APS)

PlantName:

PaloVerdeNuclear Generating

Station, Unit2 Calendar Year(CY) 2020 Operating Cycle(s)

Cycles 22and23 FuelType(s)

Westinghouse CE16STD Evaluation Model(EM):

Westinghouse S2M EMDescription:

Appendix KSmallBreak PCT Reference(s)

Note(s)

Analysis ofRecord(AOR) 16180F 1

1 Reference(s)

Note(s)

PCT Effect PCT t

Assessments A. Cumulative 10CFR50.46Changes and

+ 0 0F

+ 00F 2

ErrorCorrections

- Previously Reported B. 10CFR50.46Changes andError

+ 00F

+ 0 0F Corrections

- NewforCY2020 C.Absolute SumofCumulative 10CFR

+ 0 0F 50.46ChangesandError Corrections AOR+Assessments PCT= 16180F ThesumofthePCTfromthemost recent AORusingan acceptable evaluation model,andthe estimated cumulative effects ofchanges anderror corrections made since

thatAOR, remains less thanthe10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Westinghouse A-PV-FE-0149, Revision 1,"Palo VerdeUnits1,2and3S2MBounding SBLOCAECCS Performance Analysis,"

March22,2002.

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

AnnualReport for2019,"

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

Notes

1. PaloVerdeUnit2beganCY2020inoperating cycle 22withafull coreof241Westinghouse standard (CE16STD) assemblies.

TheunitendedtheCYinoperating cycle 23,thatunit's first fueldesign transition cycle with141Westinghouse CE16STDassemblies and100FramatomeCE16HTPassemblies.

ThePCT reported above(1618F)isbounding forbothoperating cycles forWestinghouse CE16STDfuel only.The PCTforFramatomeCE16HTPfuelisaddressed onaseparate summarysheet.

6

Enclosure SummaryofCumulative Effects onCalculated PCTforPVNGS DuetoChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit2 SmallBreakLossofCoolantAccident(SBLOCA)

PeakCladding Temperature(PCT)

Summary Sheet FramatomeCE16HTPFuelAssemblies Utility Name:

Arizona Public Service Company(APS)

PlantName:

PaloVerdeNuclear Generating

Station, Unit2 Calendar Year(CY) 2020 Operating Cycle(s)

Cycle23 FuelType(s)

Framatome CE16HTP Evaluation Model(EM):

EMF-2328 Revision 0andSupplement 1Revision 0

EMDescription:

Appendix KSmallBreak PCT Reference(s)

Note(s)

Analysis ofRecord(AOR) 16200F 1,2,3 1

Reference(s)

Note(s)

PCT Effect PCT t

Assessments A. Cumulative 10CFR50.46Changes and

+ 0 0F

+ 00F 3

ErrorCorrections

- Previously Reported B. 10CFR50.46Changes andError

+ 00F

+ 0 0F Corrections

- NewforCY2020 C.Absolute SumofCumulative 10CFR

+ 0 0F 50.46ChangesandError Corrections AOR+Assessments PCT= 16200F ThesumofthePCTfromthemost recent AORusingan acceptable evaluation model,andthe estimated cumulative effects ofchanges anderror corrections made since

thatAOR, remains less thanthe10CFR50.46(b)(1) regulatory limit of 22000F.

References

1. Framatome 32-9268122, Revision 0,"Palo VerdeVQPSBLOCATransient Analyses,"

January 18, 2018.

2. FramatomeANP-3640P, Revision 0,"Palo VerdeUnits1,2,and3SmallBreakLOCASummaryReport; Licensing Report,"

March2018.

3. FramatomeANP-3640Q1P, Revision 0,"Palo VerdeUnits1,2,and3SmallBreakLOCASummaryReport; NRCRAIResponses; Licensing Report,"

September 2019.

Notes

1. PaloVerdeUnit2 beganCY2020inoperating cycle 22withafull coreof241Westinghouse standard (CE16STD) assemblies.

TheunitendedtheCYinoperating cycle 23,thatunit's first fueldesign transition cycle with141Westinghouse CE16STDassemblies and100Framatome CE16HTPassemblies.

ThePCT reported above(1620F)isbounding forFramatomeCE16HTPfuelonly.ThePCTforWestinghouse CE16STDfuelisaddressed onaseparate summarysheet.

7

Enclosure SummaryofCumulative Effects onCalculated PCTforPVNGS DuetoChanges/Errors inECCSPerformance Evaluation Models PaloVerdeUnit3 SmallBreakLossofCoolantAccident(SBLOCA)

PeakCladding Temperature(PCT)

Summary Sheet Westinghouse CE16STDandCE16NGFFuelAssemblies Utility Name:

Arizona Public Service Company(APS)

PlantName:

PaloVerdeNuclear Generating

Station, Unit3 Calendar Year(CY) 2020 Operating Cycle(s)

Cycle22 FuelType(s)

Westinghouse CE16STDandCE16NGF Evaluation Model(EM):

Westinghouse S2M EMDescription:

Appendix KSmallBreak PCT Reference(s)

Note(s)

Analysis ofRecord(AOR) 16780F 1,2 1

Reference(s)

Note(s)

PCT Effect PCT t

Assessments A.Cumulative 10CFR50.46Changes and

+ 0 0F

+ 00F 3

ErrorCorrections

- Previously Reported B. 10CFR50.46ChangesandError

+ 0 F

+ 0 F Corrections

- NewforCY2020 C.Absolute SumofCumulative 10CFR

+ 0 F 50.46ChangesandError Corrections AOR+ Assessments PCT= 1678 F ThesumofthePCTfromthemost recent AORusingan acceptable evaluation model,andthe estimated cumulative effects ofchanges anderror corrections made sincethatAOR, remains lessthanthe10CFR50.46(b)(1) regulatory limit of 2200 F.

References

1. Westinghouse CN-TLA-14-020, Revision 1,"PaloVerdeUnits1,2and3SBLOCABounding ECCS Performance Analysis forNGFTransition,"

January 7,2016.

2. Westinghouse WCAP-18076-P, Revision 1,"Reload Transition Safety ReportforPaloVerdeNuclear Generating Station Units 1,2and3withCombustion Engineering 16x16NextGeneration Fuel,"
June30, 2016.
3. APSLetter toNRC,102-08095-MDD/MSC, "Palo VerdeNuclear Generating Station Units 1,2,and3; License Nos.NPF-41,NPF-51, andNPF-74;Docket Nos.STN50-528, 50-529, and50-530; Emergency CoreCooling SystemPerformance Evaluation
Models, 10CFR50.46(a)(3)(ii)

AnnualReport for2019,"

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

Notes

1. PaloVerdeUnit3beganandendedCY2020inoperating cycle 22,thatunit's first fueldesign transition cyclewith141Westinghouse standard (CE16STD) assemblies and100Westinghouse NextGeneration Fuel (CE16NGF) assemblies.

ThePCTreported above(1678 0F) isbounding forbothfuel typesforthat operating cycle.

8

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