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{{#Wiki_filter:Pre-Submittal Meeting for Palo Verde Unit 1, 2, and 3 Updated Spent Fuel Pool Criticality AnalysisMay 11, 2015 Purpose*Present and discuss planned licensing changeschanges-Update spent fuel pool (SFP) criticality analysis
{{#Wiki_filter:Pre-Submittal Meeting for Palo Verde Unit 1, 2, and 3 Updated Spent Fuel Pool Criticality AnalysisMay 11, 2015 Purpose*Present and discuss planned licensing changes changes-Update spent fuel pool (SFP) criticality analysis
-Add neutron absorbing inserts to SFP racks 2
-Add neutron absorbing inserts to SFP racks 2
Objectives
Objectives
Line 24: Line 24:
Borated Aluminum Inserts
Borated Aluminum Inserts
*Additional reactivity hold down is planned tomeet10CFR5068andmaintainfull to meet 10 CFR 50.68 and maintain full core offload capabilityThlhdliiittld
*Additional reactivity hold down is planned tomeet10CFR5068andmaintainfull to meet 10 CFR 50.68 and maintain full core offload capabilityThlhdliiittld
-Thermal hydraulic, seismic, structural, and pool cooling calculations will be updated as  
-Th erma l h y drau lic, se i sm ic, s t ruc tura l , an d pool cooling calculations will be updated as  


needed-Add a coupon surveillance program to monitor material performance 4
needed-Add a coupon surveillance program to monitor material performance 4
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-Reduce radially averaged enrichment from  4.8 wt% to 4.65 wt%
-Reduce radially averaged enrichment from  4.8 wt% to 4.65 wt%
7 New TS*5.5.21 -Spent Fuel Storage Rack Neutron AbsorberMonitoringprogram Absorber Monitoring program -Will consider upcoming NRC Generic Letter "MonitoringofNeutronAbsorbingMaterialsin Monitoring of Neutron-Absorbing Materials in Spent Fuel Pools" RecentDresdenOE
7 New TS*5.5.21 -Spent Fuel Storage Rack Neutron AbsorberMonitoringprogram Absorber Monitoring program -Will consider upcoming NRC Generic Letter "MonitoringofNeutronAbsorbingMaterialsin Monitoring of Neutron-Absorbing Materials in Spent Fuel Pools" RecentDresdenOE
-Recent Dresden OE-License extension
-R ecent Dresden OE-License extension
-Plant decommissioning 8
-Plant decommissioning 8
Implementation  
Implementation  
*Prior to NGF implementation in each unit
*Prior to NGF implementation in each unit
*Considering installing inserts under            10CFR5059 10 CFR 50.59Cidiliditif
*Considering installing inserts under            10CFR5059 10 CFR 50.59Cidiliditif
*Considering a license con dition for a specified period of time to transition betweenTS between TS9 Methodology
*C ons id er i ng a li cense con diti on f or a specified period of time to transition betweenTS between TS 9 Methodology
*Based onISG201001"StaffGuidanceRegardingthe
*Based on ISG 201001"StaffGuidanceRegardingthe
-ISG-2010-01, "Staff Guidance Regarding the Nuclear Criticality Safety Analysis for Spent Fuel Pools"
-ISG-2010-01 , "Staff Guidance Regarding the Nuclear Criticality Safety Analysis for Spent Fuel Pools"
-NEI 12-16, "Guidance for Performing Criticality Analyses of Fuel Storage at Light-Water ReactorPowerPlants "Revision1Reactor Power Plants, Revision 1-EPRI Depletion Benchmark Reports
-NEI 12-16, "Guidance for Performing Criticality Analyses of Fuel Storage at Light-Water ReactorPowerPlants "Revision1Reactor Power Plants , Revision 1-EPRI Depletion Benchmark Reports
-Multiple NUREGs p10 Recent Licensing Actions
-Multi ple NUREGs p 10 Recent Licensing Actions
*Methodology similar to:
*Methodology similar to:
-ComanchePeak
-ComanchePeak
Line 56: Line 56:
-Turkey Point
-Turkey Point
*Insert material similar to:
*Insert material similar to:
-LaSallePhBtt-Peach Bottom-Quad Cities
-LaSallePhBtt-P eac h B o tt om-Quad Cities
*Criticalitycode usagesimilarto:
*Criticalitycode usagesimilarto:
Criticality code usage similar to:-Millstone 2 11 ISG Item 1 -Fuel Assembly Selection
Criticality code u sage similar to:-Millstone 2 11 ISG Item 1 -Fuel Assembly Selection
*Palo Verde will demonstrate that variations indesignareadequatelyaccountedforin in design are adequately accounted for in a single, limiting, fuel assembly designCEStddFl-CE Standard Fuel-CE Value Added Pellet
*Palo Verde will demonstrate that variations indesignareadequatelyaccountedforin in design are adequately accounted for in a single, limiting, fuel assembly designCEStddFl-CE St an d ar d F ue l-CE Value Added Pellet
-Westinghouse NGF (8 LUAs)
-Westinghouse NGF (8 LUAs)
-AREVAAdvancedCE
-AREVAAdvancedCE
-16HTP(8LTAs)AREVA Advanced CE16 HTP (8 LTAs)12 ISG Item 2 -Depletion Analysis  
-16HTP(8LTAs)AREVA Advanced CE 16 HTP (8 LTAs)12 ISG Item 2 -Depletion Analysis  
*Depletion parameters will impact the isotopicinventoryofburnedfuel isotopic inventory of burned fuel*Major depletion inputs
*Depletion parameters will impact the isotopicinventoryofburnedfuel isotopic inventory of burned fuel*Major depletion inputs
-Fuel type
-Fuel type-Axial burnup  
-Axial burnup  
-Moderator temperature
-Moderator temperature
-Reactor powerSolubleboron
-Reactor powerSolubleboron
Line 71: Line 70:
*The EPRI methodology will be used to demonstratethe5%depletionuncertaintydemonstrate the 5% depletion uncertainty is conservative for Palo Verde
*The EPRI methodology will be used to demonstratethe5%depletionuncertaintydemonstrate the 5% depletion uncertainty is conservative for Palo Verde
*Fission product uncertainty explicitly considered 14 ISG Item 2.b -Reactor Parameters
*Fission product uncertainty explicitly considered 14 ISG Item 2.b -Reactor Parameters
*Limiting axial moderator temperature profiles derivedpastpresentandanticipatedprofilesderived past, present, and anticipated profiles-Same methodolo gy employed at Comanche Peakgypy*Analysis performed at 4070 MWth
*Limiting axial moderator temperature profiles derivedpastpresentandanticipatedprofilesderived past , present , and anticipated profiles-Same methodolo gy em p lo yed at Comanche Peakgypy*Analysis performed at 4070 MWth
*Licensee controls include verification of radial diibidTldpower distribution and T-cold15 ISG Item 2.c -Burnable Absorbers
*Licensee controls include verification of radial diibidT ld power di str ib ut i on an d T-co ld 15 ISG Item 2.c -Burnable Absorbers
*Palo Verde has used the following integral burnable absorbers
*Palo Verde has used the following integral burnable absorbers-B 4C rods in CE STD Fuel
-B4C rods in CE STD Fuel
-Erbia in CE STD Fuel and Value Added Pellet
-Erbia in CE STD Fuel and Value Added Pellet
-IntegralFuelBurnableAbsorber(IFBA)inNGFIntegral Fuel Burnable Absorber (IFBA) in NGF -Gadolinia in AREVA Fuel  
-IntegralFuelBurnableAbsorber(IFBA)inNGFIntegral Fuel Burnable Absorber (IFBA) in NGF -Gadolinia in AREVA Fuel  
*AnalysiswillnotcreditErbiaBCorGadolinia
*AnalysiswillnotcreditErbiaBCorGadolinia
*Analysis will not credit Erbia, B4C, or Gadolinia
*Analysis will not credit Erbia , B 4 C , or Gadolinia*NGF fuel modeled with IFBA in all 236 pins for de pletion anal y sis onl ypyy-Pool model assumes no burnable absorbers 16 ISG Item 2.d -Rodded Operation
*NGF fuel modeled with IFBA in all 236 pins for depletion anal ysis onlypyy-Pool model assumes no burnable absorbers 16 ISG Item 2.d -Rodded Operation
*Palo Verde does not operate with control rods inserted rods inserted-Guide tube wear program
*Palo Verde does not operate with control rodsinsertedrods inserted-Guide tube wear program
*End of cycle check will ensure that fuel assembliesexperiencedaninsignificant assemblies experienced an insignificant amount of rodded operation at hot full p owe r p 17 ISG Item 3 -Criticality Analysis
*End of cycle check will ensure that fuel assembliesexperiencedaninsignificant assemblies experienced an insignificant amount of rodded operation at hot full powerp17 ISG Item 3 -Criticality Analysis
*SCALE 6.1.2 will be used in the analysis
*SCALE 6.1.2 will be used in the analysis
-KENO V.a solves the eigenvalue (k eff) problem in 3D using the Monte Carlo method
-KENO V.a solves the eigenvalue (k eff) problem in 3D using the Monte Carlo method
-238 Group ENDF/B-VII will be used as the library-Millstone LAR used SCALE 6.0 with the KENO V.a module and 238 Group ENDF/B-VII library 18 ISG Item 3.a -Axial Burnup Profile
-238 Group ENDF/B-VII will be used as the library-Millstone LAR used SCALE 6.0 with the KENO V.a module and 238 Group ENDF/B-VII library 18 ISG Item 3.a -Axial Burnup Profile
*Bounding axial burnup profiles selected frompastpresentandanticipated from past, present, and anticipated profilesClifilitlildhk
*Bounding axial burnup profiles selected frompastpresentandanticipated from past , present , and anticipated profilesClifilitlildhk
-Cycle specific licensee con trols include checks on cutback regions (blanket), fuel design, and moderator temperature
-C yc l e spec ifi c li censee con t ro l s i nc l u d e c h ec k s on cutback regions (blanket), fuel design, and moderator temperature
-Same methodology used at Comanche Peak and Prairie Island 19 ISG Item 3.b -Rack Model
-Same methodology used at Comanche Peak and Prairie Island 19 ISG Item 3.b -Rack Model
*Dimensions and tolerance of racks are traceabletodesigndocumentstraceable to design documentsBoratedaluminuminsertB10areal*Borated aluminum insert B-10 areal density conservatively modeled at quantitylessthanminimumcertifiedareal quantity less than minimum certified areal density20 ISG Item 3.c -Interfaces
*Dimensions and tolerance of racks are traceabletodesigndocumentstraceable to design documentsBoratedaluminuminsertB10areal*Borated aluminum insert B-10 areal density conservatively modeled at quantitylessthanminimumcertifiedareal quantity less than minimum certified areal density 20 ISG Item 3.c -Interfaces
*All interfaces are evaluated and all interfacesareanacceptable2x2array interfaces are an acceptable 2x2 array-Palo Verde has only one rack design
*All interfaces are evaluated and all interfacesareanacceptable2x2array interfaces are an acceptable 2x2 array-Palo Verde has only one rack design
-No gaps modeled between rack modules 21 ISG Item 3.d -Normal Conditions
-No gaps modeled between rack modules 21 ISG Item 3.d -Normal Conditions
*Analysis demonstrates that k eff 0.95 at lessthantheTSrequiredboron less than the TS required boron concentration for:Fuelmovement
*Analysis demonstrates that k eff 0.95 at lessthantheTSrequiredboron less than the TS required boron concentration for:Fuelmovement
-Fuel movement-Fuel inspection and reconstitutionForeignObjectSearchandRetrieval
-Fuel movement-Fuel inspection and reconstitutionForeignObjectSearchandRetrieval
-Foreign Object Search and Retrieval
-Foreign Object Search and Retrieval-Limiting normal condition to initiate accident identified identified 22 ISG Item 3.e -Accident Conditions
-Limiting normal condition to initiate accident identified identified 22 ISG Item 3.e -Accident Conditions
*Analysis demonstrates that k eff 0.95 at lessthantheTSrequiredboron less than the TS required boron concentration forMisloadedordroppedsinglefreshfuel
*Analysis demonstrates that k eff 0.95 at lessthantheTSrequiredboron less than the TS required boron concentration forMisloadedordroppedsinglefreshfuel
-Misloaded or dropped single fresh fuel assembly into, outside of, or on top of spent fuel racks
-Misloaded or dropped single fresh fuel assembly into, outside of, or on top of spent fuel racks
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*TRM requires boron concentration to be maintained at 4000 ppm 24 ISG Item 4 -Code Validation
*TRM requires boron concentration to be maintained at 4000 ppm 24 ISG Item 4 -Code Validation
*Will perform criticality code validation in accordancewithNUREG/CR
*Will perform criticality code validation in accordancewithNUREG/CR
-6698accordance with NUREG/CR-6698-Data carefully considered to identify trends consistentwithNUREG 1475consistent with NUREG-1475-HTC experiments will be included
-6698 accordance with NUREG/CR-6698-Data carefully considered to identify trends consistentwithNUREG 1475 consistent with NUREG-1475-HTC experiments will be included
*Fission products will be explicitly accounted for
*Fission products will be explicitly accounted for
-No lumped fission products will be used 25 Palo Verde Arrays
-No lumped fission products will be used 25 Palo Verde Arrays
*6 arrays will be analyzed
*6 arrays will be analyzed
*Palo Verde expects to submit between 3 and6ofthefollowingarraysforapproval and 6 of the following arrays for approvalFildiifltid
*Palo Verde expects to submit between 3 and6ofthefollowingarraysforapproval and 6 of the following arrays for approvalFildiifltid
*Final designs specify location and orientation of borated aluminum inserts 26 Palo Verde Arrays
*Fi na l d es i gns spec if y l oca ti on an d orientation of borated aluminum inserts 26 Palo Verde Arrays
*Infinite array of 2 fresh fuel assemblies (Fr)withtwoblockedlocationsandno (Fr) with two blocked locations and no inserts27 Palo Verde Arrays
*Infinite array of 2 fresh fuel assemblies (Fr)withtwoblockedlocationsandno (Fr) with two blocked locations and no inserts 27 Palo Verde Arrays
*Infinite array of 2 fresh fuel assemblies (Fr)withtwotrashcans(TC)andtwo (Fr) with two trash cans (TC) and two inserts28 Palo Verde Arrays
*Infinite array of 2 fresh fuel assemblies (Fr)withtwotrashcans(TC)andtwo (Fr) with two trash cans (TC) and two inserts28 Palo Verde Arrays
*Infinite array of 3 low reactivity fuel assemblies(Lo)and1high(Hi)reactivity assemblies (Lo) and 1 high (Hi) reactivity fuel assembly with 2 inserts29 Palo Verde Arrays
*Infinite array of 3 low reactivity fuel assemblies(Lo)and1high(Hi)reactivity assemblies (Lo) and 1 high (Hi) reactivity fuel assembly with 2 inserts29 Palo Verde Arrays
*Infinite array of 2 high reactivity fuel assemblies(Hi)andonelowreactivityfuel assemblies (Hi) and one low reactivity fuel assembly (Lo) with one blocked cell and oneinsert one insert30 Palo Verde Arrays
*Infinite array of 2 high reactivity fuel assemblies(Hi)andonelowreactivityfuel assemblies (Hi) and one low reactivity fuel assembly (Lo) with one blocked cell and oneinsert one insert 30 Palo Verde Arrays
*Infinite array of 4 low reactivity fuel assemblies(Lo)withoneinsert assemblies (Lo) with one insert31 Palo Verde Arrays
*Infinite array of 4 low reactivity fuel assemblies(Lo)withoneinsert assemblies (Lo) with one insert31 Palo Verde Arrays
*Infinite array of 4 depleted fuel assemblies (De)withnoinserts (De) with no inserts32 Margin Maintenance
*Infinite array of 4 depleted fuel assemblies (De)withnoinserts (De) with no inserts32 Margin Maintenance
*Palo Verde will monitor the margin identifiedintheanalysis identified in the analysis*CyclespecificchecksofkeyinputCycle specific checks of key input parameters
*Palo Verde will monitor the margin identifiedintheanalysis identified in the analysis*CyclespecificchecksofkeyinputCycle specific checks of key input parameters
*0.005 k additional margin reserved by    Palo VerdeBurnupandenrichmentcurveswillbefor
*0.005 k additional margin reserved by    Palo VerdeBurnupandenrichmentcurveswillbefor
-Burnup and enrichment curves will be for      keff= 0.9933 Conclusion
-Burnup and enrichment curves will be for      k eff= 0.99 33 Conclusion
*Palo Verde is proposing an acceptable methodolo gy for performing SFP criticalit y gypgyanalysisllldbdl*Permanent ly installed borated aluminum inserts will be credited in the analysis
*Palo Verde is proposing an acceptable methodolo gy for p erformin g SFP criticalit y gypgy analysisllldbdl*Permanent l y insta ll e d borate d a l uminum inserts will be credited in the analysis
*Submit LAR by Nov 2015
*Submit LAR by Nov 2015
*Request NRC approval in 18 -24 months 34}}
*Request NRC approval in 18 -24 months 34}}

Revision as of 04:00, 9 July 2018

5/11/2015, Meeting Slide Regarding Pre-Submittal Meeting for Palo Verde Unit 1, 2, and 3 Updated Spent Fuel Pool Criticality Analysis
ML15134A359
Person / Time
Site: Palo Verde  Arizona Public Service icon.png
Issue date: 05/11/2015
From:
Arizona Public Service Co
To: Regner L M
Plant Licensing Branch IV
Regner L M
References
Download: ML15134A359 (34)
v • d • e


Text

Pre-Submittal Meeting for Palo Verde Unit 1, 2, and 3 Updated Spent Fuel Pool Criticality AnalysisMay 11, 2015 Purpose*Present and discuss planned licensing changes changes-Update spent fuel pool (SFP) criticality analysis

-Add neutron absorbing inserts to SFP racks 2

Objectives

  • Updated criticality analysis will

-Provide basis for replacing non-conservative Technical Specification (TS) caused by missed poweruprateimpact power uprate impact-Include Next Generation Fuel (NGF)

  • Account for reactivity effects of integral fuel burnable absorber (IFBA)Maintainfullcoreoffloadcapability

-Maintain full core offload capability 3

Borated Aluminum Inserts

  • Additional reactivity hold down is planned tomeet10CFR5068andmaintainfull to meet 10 CFR 50.68 and maintain full core offload capabilityThlhdliiittld

-Th erma l h y drau lic, se i sm ic, s t ruc tura l , an d pool cooling calculations will be updated as

needed-Add a coupon surveillance program to monitor material performance 4

TS Changes

  • TS 3.7.17 -Spent Fuel Assembly Storage

-Incorporate new burnup and enrichment curves-Display information with the polynomial explicitly stated

-Include diagrams of approved arrays 5

TS Changes

  • TS 3.7.15 -Fuel Storage Pool Boron

-Currently 2150 ppm

-May increase in response to accident conditions analysis 6

TS Changes

  • TS 4.3 -Fuel Storage

-Incorporate new arrays

-Update boron concentration

-Reduce radially averaged enrichment from 4.8 wt% to 4.65 wt%

7 New TS*5.5.21 -Spent Fuel Storage Rack Neutron AbsorberMonitoringprogram Absorber Monitoring program -Will consider upcoming NRC Generic Letter "MonitoringofNeutronAbsorbingMaterialsin Monitoring of Neutron-Absorbing Materials in Spent Fuel Pools" RecentDresdenOE

-R ecent Dresden OE-License extension

-Plant decommissioning 8

Implementation

  • Prior to NGF implementation in each unit
  • Considering installing inserts under 10CFR5059 10 CFR 50.59Cidiliditif
  • C ons id er i ng a li cense con diti on f or a specified period of time to transition betweenTS between TS 9 Methodology
  • Based on ISG 201001"StaffGuidanceRegardingthe

-ISG-2010-01 , "Staff Guidance Regarding the Nuclear Criticality Safety Analysis for Spent Fuel Pools"

-NEI 12-16, "Guidance for Performing Criticality Analyses of Fuel Storage at Light-Water ReactorPowerPlants "Revision1Reactor Power Plants , Revision 1-EPRI Depletion Benchmark Reports

-Multi ple NUREGs p 10 Recent Licensing Actions

  • Methodology similar to:

-ComanchePeak

-Comanche Peak-Prairie Island

-Turkey Point

  • Insert material similar to:

-LaSallePhBtt-P eac h B o tt om-Quad Cities

  • Criticalitycode usagesimilarto:

Criticality code u sage similar to:-Millstone 2 11 ISG Item 1 -Fuel Assembly Selection

  • Palo Verde will demonstrate that variations indesignareadequatelyaccountedforin in design are adequately accounted for in a single, limiting, fuel assembly designCEStddFl-CE St an d ar d F ue l-CE Value Added Pellet

-Westinghouse NGF (8 LUAs)

-AREVAAdvancedCE

-16HTP(8LTAs)AREVA Advanced CE 16 HTP (8 LTAs)12 ISG Item 2 -Depletion Analysis

  • Depletion parameters will impact the isotopicinventoryofburnedfuel isotopic inventory of burned fuel*Major depletion inputs

-Fuel type-Axial burnup

-Moderator temperature

-Reactor powerSolubleboron

-Soluble boron-Burnable absorbers 13 ISG Item 2.a -Depletion Uncertainty

  • The EPRI methodology will be used to demonstratethe5%depletionuncertaintydemonstrate the 5% depletion uncertainty is conservative for Palo Verde
  • Fission product uncertainty explicitly considered 14 ISG Item 2.b -Reactor Parameters
  • Limiting axial moderator temperature profiles derivedpastpresentandanticipatedprofilesderived past , present , and anticipated profiles-Same methodolo gy em p lo yed at Comanche Peakgypy*Analysis performed at 4070 MWth
  • Licensee controls include verification of radial diibidT ld power di str ib ut i on an d T-co ld 15 ISG Item 2.c -Burnable Absorbers
  • Palo Verde has used the following integral burnable absorbers-B 4C rods in CE STD Fuel

-Erbia in CE STD Fuel and Value Added Pellet

-IntegralFuelBurnableAbsorber(IFBA)inNGFIntegral Fuel Burnable Absorber (IFBA) in NGF -Gadolinia in AREVA Fuel

  • AnalysiswillnotcreditErbiaBCorGadolinia
  • Analysis will not credit Erbia , B 4 C , or Gadolinia*NGF fuel modeled with IFBA in all 236 pins for de pletion anal y sis onl ypyy-Pool model assumes no burnable absorbers 16 ISG Item 2.d -Rodded Operation
  • Palo Verde does not operate with control rods inserted rods inserted-Guide tube wear program
  • End of cycle check will ensure that fuel assembliesexperiencedaninsignificant assemblies experienced an insignificant amount of rodded operation at hot full p owe r p 17 ISG Item 3 -Criticality Analysis
  • SCALE 6.1.2 will be used in the analysis

-KENO V.a solves the eigenvalue (k eff) problem in 3D using the Monte Carlo method

-238 Group ENDF/B-VII will be used as the library-Millstone LAR used SCALE 6.0 with the KENO V.a module and 238 Group ENDF/B-VII library 18 ISG Item 3.a -Axial Burnup Profile

  • Bounding axial burnup profiles selected frompastpresentandanticipated from past , present , and anticipated profilesClifilitlildhk

-C yc l e spec ifi c li censee con t ro l s i nc l u d e c h ec k s on cutback regions (blanket), fuel design, and moderator temperature

-Same methodology used at Comanche Peak and Prairie Island 19 ISG Item 3.b -Rack Model

  • Dimensions and tolerance of racks are traceabletodesigndocumentstraceable to design documentsBoratedaluminuminsertB10areal*Borated aluminum insert B-10 areal density conservatively modeled at quantitylessthanminimumcertifiedareal quantity less than minimum certified areal density 20 ISG Item 3.c -Interfaces
  • All interfaces are evaluated and all interfacesareanacceptable2x2array interfaces are an acceptable 2x2 array-Palo Verde has only one rack design

-No gaps modeled between rack modules 21 ISG Item 3.d -Normal Conditions

  • Analysis demonstrates that k eff 0.95 at lessthantheTSrequiredboron less than the TS required boron concentration for:Fuelmovement

-Fuel movement-Fuel inspection and reconstitutionForeignObjectSearchandRetrieval

-Foreign Object Search and Retrieval-Limiting normal condition to initiate accident identified identified 22 ISG Item 3.e -Accident Conditions

  • Analysis demonstrates that k eff 0.95 at lessthantheTSrequiredboron less than the TS required boron concentration forMisloadedordroppedsinglefreshfuel

-Misloaded or dropped single fresh fuel assembly into, outside of, or on top of spent fuel racks

-Multiple misloaded fuel assemblies

-Loss of SFP cooling

-Seismic events 23 ISG Item 3.e (contd.)

  • Limiting dilution event reduces pool boron from2150ppmto1900ppm from 2150 ppm to 1900 ppm TRMrequiresboronconcentrationtobe
  • TRM requires boron concentration to be maintained at 4000 ppm 24 ISG Item 4 -Code Validation
  • Will perform criticality code validation in accordancewithNUREG/CR

-6698 accordance with NUREG/CR-6698-Data carefully considered to identify trends consistentwithNUREG 1475 consistent with NUREG-1475-HTC experiments will be included

  • Fission products will be explicitly accounted for

-No lumped fission products will be used 25 Palo Verde Arrays

  • 6 arrays will be analyzed
  • Palo Verde expects to submit between 3 and6ofthefollowingarraysforapproval and 6 of the following arrays for approvalFildiifltid
  • Fi na l d es i gns spec if y l oca ti on an d orientation of borated aluminum inserts 26 Palo Verde Arrays
  • Infinite array of 2 fresh fuel assemblies (Fr)withtwoblockedlocationsandno (Fr) with two blocked locations and no inserts 27 Palo Verde Arrays
  • Infinite array of 2 fresh fuel assemblies (Fr)withtwotrashcans(TC)andtwo (Fr) with two trash cans (TC) and two inserts28 Palo Verde Arrays
  • Infinite array of 3 low reactivity fuel assemblies(Lo)and1high(Hi)reactivity assemblies (Lo) and 1 high (Hi) reactivity fuel assembly with 2 inserts29 Palo Verde Arrays
  • Infinite array of 2 high reactivity fuel assemblies(Hi)andonelowreactivityfuel assemblies (Hi) and one low reactivity fuel assembly (Lo) with one blocked cell and oneinsert one insert 30 Palo Verde Arrays
  • Infinite array of 4 low reactivity fuel assemblies(Lo)withoneinsert assemblies (Lo) with one insert31 Palo Verde Arrays
  • Infinite array of 4 depleted fuel assemblies (De)withnoinserts (De) with no inserts32 Margin Maintenance
  • Palo Verde will monitor the margin identifiedintheanalysis identified in the analysis*CyclespecificchecksofkeyinputCycle specific checks of key input parameters
  • 0.005 k additional margin reserved by Palo VerdeBurnupandenrichmentcurveswillbefor

-Burnup and enrichment curves will be for k eff= 0.99 33 Conclusion

  • Palo Verde is proposing an acceptable methodolo gy for p erformin g SFP criticalit y gypgy analysisllldbdl*Permanent l y insta ll e d borate d a l uminum inserts will be credited in the analysis
  • Submit LAR by Nov 2015
  • Request NRC approval in 18 -24 months 34
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