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#REDIRECT [[RS-21-064, Attachment 5: Appendix C, NEI 12-16 Criticality Analysis Checklist]]
| number = ML21265A558
| issue date = 06/30/2021
| title = Attachment 5: Appendix C, NEI 12-16 Criticality Analysis Checklist
| author name =
| author affiliation = Exelon Generation Co, LLC
| addressee name =
| addressee affiliation = NRC/NRR
| docket = 05000373, 05000374
| license number = NPF-011, NPF-018
| contact person =
| case reference number = RS-21-064
| document type = Report, Miscellaneous
| page count = 9
}}
 
=Text=
{{#Wiki_filter:ATTACHMENT 5 NEI 12-16 Criticality Analysis Checklist
 
APPENDIX C: CRITICALITY ANALYSIS CHECKLIST The criticality analysis checklist is completed by the applicant prior to submittal to the NRC. It provides a useful guide to the applicant to ensure that all the applicable subject areas are addressed in the application, or to provide justification/identification of alternative approaches.
The checklist also assists the NRC reviewer in identifying areas of the analysis that conform or do not conform to the guidance in NEI 12-16. Subsequently, the NRC review can then be more efficiently focused on those areas that deviate from NEI 12-16 and the justification for those deviations.
Subject                        Included                Notes / Explanation 1.0 Introduction and Overview Purpose of submittal                                  YES        Section 1.0 of NEDC-33931P and Section 1.0 of LAR RS-21-064 Changes requested                                      YES        Section 1.0 of NEDC-33931P and Sections 2.1, 2.2, 2.3, and 2.4 of LAR RS-21-064 Summary of physical changes                  YES        Section 1.0 of NEDC-33931P and Sections 2.1, 2.2, 2.3, and 2.4 of LAR RS-21-064 Summary of Tech Spec changes                  YES        Sections 2.3, 2.4 and Attachment 2 of LAR RS-21-064 Summary of analytical scope                  YES        Sections 1.0 and 3.0 of NEDC-33931P and Sections 2.1 and 2.2 of LAR RS-21-064 2.0 Acceptance Criteria and Regulatory Guidance Summary of requirements and guidance                  YES        Section 2.0 of NEDC-33931P and Sections 2.1 and 2.2 of LAR RS                                                                    064 Requirements documents referenced            YES        Section 2.0 of NEDC-33931P and Sections 2.1 and 2.2 of LAR RS                                                                    064 Guidance documents referenced                YES        Section 2.0 of NEDC-33931P and Sections 2.1 and 2.2 of LAR RS                                                                    064 Acceptance criteria described                YES        Section 2.0 of NEDC-33931P and Sections 2.1 and 2.2 of LAR RS                                                                    064 3.0 Reactor and Fuel Design Description Describe reactor operating parameters                  NO        Not applicable for the NEDC-33931P analysis. See Sections 3.7 and 5.5 of C-1
 
NEDC-33931P for depletion parameters and assumptions.
Describe all fuel in pool                      YES Section 4.0 of NEDC-33931P Geometric dimensions (Nominal and        YES Section 4.1 of NEDC-33931P Tolerances)
Schematic of guide tube patterns        NO  Not applicable for BWR fuel Material compositions                    YES Section 4.0 of NEDC-33931P Describe future fuel to be covered              YES Section 4.0 of NEDC-33931P Geometric dimensions (Nominal and        YES Section 4.1 of NEDC-33931P Tolerances)
Schematic of guide tube patterns        NO  Not applicable for BWR fuel Material compositions                    YES Section 4.0 of NEDC-33931P Describe all fuel inserts                      NO  There are no fuel inserts in analysis Geometric Dimensions (Nominal and            NEDC-33931P.
Tolerances)
Schematic (axial/cross-section)
Material compositions Describe non-standard fuel                      YES Section 4.0 of NEDC-33931P Geometric dimensions Describe non-fuel items in fuel cells          YES Section 4.0 of NEDC-33931P Nominal and tolerance dimensions        NO  Not applicable; analysis NEDC-33931P covers peak reactivity in every rack cell location 4.0 Spent Fuel Pool/Storage Rack Description New fuel vault & Storage rack description      YES The new fuel vault analysis will be Nominal and tolerance dimensions            covered by the GESTAR II Schematic (axial/cross-section)              methodology and is not addressed in Material compositions                        NEDC-33931P. See Section 2.2 of LAR RS-21-064 for details.
Spent fuel pool, Storage rack description      YES Section 5.1 of NEDC-33931P and Nominal and tolerance dimensions            Section 3.1 of LAR RS-21-064 Schematic (axial/cross-section)
Material compositions Other Reactivity Control Devices (Inserts)      YES Sections 5.1-5.2 of NEDC-33931P and Nominal and tolerance dimensions            Section 3.1 of LAR RS-21-064 Schematic (axial/cross-section)
Material compositions 5.0 Overview of the Method of Analysis New fuel rack analysis description              YES The new fuel vault analysis will be Storage geometries                          covered by the GESTAR II Bounding assembly design(s)                  methodology and is not addressed in Integral absorber credit                    NEDC-33931P. See Section 2.2 of Accident analysis                            LAR RS-21-064 for details.
Spent fuel storage rack analysis description    YES Sections 5.0, 3.5-3.7 of NEDC-33931P C-2
 
Storage geometries                      YES Sections 5.1-5.2 of NEDC-33931P Bounding assembly design(s)            YES Section 5.3 of NEDC-33931P Soluble boron credit                    NO  Not applicable - No soluble boron credit in this BWR criticality analysis Boron dilution analysis            (NEDC-33931P)
Burnup credit                          NO  No burnup credit in BWR peak reactivity analysis NEDC-33931P -
fuel is evaluated at peak reactivity Decay/Cooling time credit              NO  No decay/cooling time credit in analysis NEDC-33931P.
Integral absorber credit                YES Sections 5.1-5.2 of NEDC-33931P Other credit                            NO  No other credit in analysis NEDC-33931P.
Fixed neutron absorbers                YES Boral panel (unit 1), insert (unit 2)
Aging management program        NO  Aging is not included in analysis NEDC-33931P; for Unit 2, no credit is taken for Boraflex. The potential for blistering on the Boral has been evaluated and the neutron absorber will continue to fulfill its function.
Accident analysis                      YES Section 5.5.3 of NEDC-33931P Temperature increase            YES Sections 5.4-5.5 of NEDC-33931P Assembly drop                  YES Section 5.5.3 of NEDC-33931P Single assembly misload        YES Section 5.5.3 of NEDC-33931P Multiple misload                NO  Uniform pool, no opportunity for multiple misload Boron dilution                  NO  Not applicable - No soluble boron credit in this BWR criticality analysis (NEDC-33931P)
Other                          YES Section 5.6 of NEDC-33931P Fuel out of rack analysis              YES Section 5.5 of NEDC-33931P considers Handling                            worst case abnormal positioning of a Movement                            fuel assembly outside the storage rack.
Inspection 6.0 Computer Codes, Cross Sections and Validation Overview Code/Modules Used for Calculation of keff    YES Section 3.0 of NEDC-33931P Cross section library                  YES Section 3.1 of NEDC-33931P Description of nuclides used            YES Section 4.2 of NEDC-33931P Convergence checks                      YES Section 3.3 of NEDC-33931P Code/Module Used for Depletion                YES Section 3.0 of NEDC-33931P Calculation Cross section library                  YES Section 3.1 of NEDC-33931P Description of nuclides used            YES Section 4.2 of NEDC-33931P Convergence checks                      YES Section 3.3 of NEDC-33931P C-3
 
Validation of Code and Library                  YES Section 3.4, Appendix A of NEDC-33931P Major Actinides and Structural          YES Section 3.4 of NEDC-33931P Materials Minor Actinides and Fission Products    YES Section 3.4 of NEDC-33931P Absorbers Credited                      YES Section 3.4 of NEDC-33931P 7.0 Criticality Safety Analysis of the New Fuel Rack Rack model                                      YES The NFV rack CSA coverage for the Boundary conditions                          new GNF3 fuel will be the GESTAR II Source distribution                          analysis for GE designed low density Geometry restrictions                              NFV racks upon approval of this Limiting fuel design                                proposed license amendment. The Fuel density                                LSCS NFV racks are GE designed low Burnable Poisons                            density racks with an interrack spacing Fuel dimensions                              of 12.25 inches, which is  10.5 inches Axial blankets                              (the criteria listed in GESTAR II) and Limiting rack model                                thus the racks may be utilized to store Storage vault dimensions and materials      new GNF fuel with in-rack SCCG kinf Temperature                                  1.31. See Section 2.3 of LAR RS                                                    064 for details.
Multiple regions/configurations Flooded Low density moderator Eccentric fuel placement Tolerances Fuel geometry Fuel pin pitch Fuel pellet OD Fuel clad OD Fuel content Enrichment Density Integral absorber Rack geometry Rack pitch Cell wall thickness Storage vault dimensions/materials Code uncertainty Biases Temperature Code bias Moderator Conditions Fully flooded and optimum density moderator C-4
 
8.0 Depletion Analysis for Spent Fuel Depletion Model Considerations                  YES Sections 3.0, 3.3, 3.4, 3.7, and 4.2 of Time step verification                      NEDC-33931P Convergence verification Simplifications Non-uniform enrichments Post Depletion Nuclide Adjustment Cooling Time Depletion Parameters Burnable Absorbers Integral Absorbers Soluble Boron Fuel and Moderator Temperature Power Control rod insertion Atypical Cycle Operating History 9.0 Criticality Safety Analysis of Spent Fuel Pool Storage Racks Rack model                                      YES Section 5.2 of NEDC-33931P Boundary conditions Source distribution Geometry restrictions Design Basis Fuel Description                  YES Section 5.3 of NEDC-33931P Fuel density                            YES Section 4.1 of NEDC-33931P Burnable Poisons                        YES Section 5.2 of NEDC-33931P Fuel assembly inserts                    NO  No fuel assembly inserts in analysis NEDC-33931P Fuel dimensions                          YES Section 4.1 of NEDC-33931P Axial blankets                          NO  Section 3.7 of NEDC-33931P Configurations considered                YES Section 6.0 of NEDC-33931P Borated                          NO  Not applicable for this BWR analysis (NEDC-33931P)
Unborated                        YES BWR analysis NEDC-33931P considers unborated SFP.
Multiple rack designs            YES Section 5.1 for rack descriptions and Section 6.0 for rack interfaces.
Alternate storage geometry      NO  Not applicable for analysis NEDC-33931P Reactivity Control Devices                      YES Sections 5.1- 5.2 Fuel Assembly Inserts                    NO  No fuel assembly inserts in analysis NEDC-33931P Storage Cell Inserts                    YES Sections 5.1- 5.2 of NEDC-33931P Storage Cell Blocking Devices            NO  No blocking devices in analysis NEDC-33931P Axial burnup shapes                            NO  Section 3.7 of NEDC-33931P C-5
 
Uniform/Distributed                      YES Section 3.7 of NEDC-33931P Nodalization                            NO  Section 3.7 of NEDC-33931P Blankets modeled                        NO  Section 3.7 of NEDC-33931P Tolerances/Uncertainties                        YES Sections 5.6 and 5.7 of NEDC-33931P Fuel geometry Fuel rod pin pitch Fuel pellet OD Cladding OD Axial fuel position              NO  Section 3.7 of NEDC-33931P Fuel content                            YES Section 5.6 of NEDC-33931P Enrichment Density Assembly insert dimensions and          NO  No fuel assembly inserts in analysis materials                                    NEDC-33931P Rack geometry                            YES Section 5.6 of NEDC-33931P Flux-trap size (width)          NO  Not applicable to non-flux-trap racks Rack cell pitch                  YES Section 5.6 of NEDC-33931P Rack wall thickness              YES Section 5.6 of NEDC-33931P Neutron Absorber Dimensions      YES Section 5.6 of NEDC-33931P Rack insert dimensions and materials    YES Section 5.6 of NEDC-33931P Code validation uncertainty              YES Sections 3.4, 5.7, and Appendix A of NEDC-33931P Criticality case uncertainty            YES Section 5.7 of NEDC-33931P Depletion Uncertainty                    YES Sections 3.4, 5.8 of NEDC-33931P Burnup Uncertainty                      NO  Not applicable for BWR peak reactivity analysis NEDC-33931P Biases                                          YES Section 5.0 of NEDC-33931P Design Basis Fuel design                YES Section 5.3 of NEDC-33931P Code bias                                YES Sections 3.4, 5.5 of NEDC-33931P Temperature                              YES Section 5.4 of NEDC-33931P Eccentric fuel placement                YES Sections 5.4-5.5 of NEDC-33931P Incore thimble depletion effect          NO  Not applicable for analysis NEDC-33931P NRC administrative margin                NO  Not applicable for analysis NEDC-33931P Modeling simplifications                        YES Sections 3.7, 4.2 of NEDC-33931P Identified and described 10.0 Interface Analysis Interface configurations analyzed              YES Sections 5.5, 6.0 of NEDC-33931P Between dissimilar racks                YES Section 6.0 of NEDC-33931P Between storage configurations within    YES Section 5.5 of NEDC-33931P a rack Interface restrictions                          NO  Section 6.0 of NEDC-33931P C-6
 
11.0 Normal Conditions Fuel handling equipment                      NO  Not in the scope and does not impact results of criticality analysis NEDC-33931P.
Administrative controls                      YES Section 2.4 and Attachment 2 of LAR RS-21-064 Fuel inspection equipment or processes        NO  Not in the scope and does not impact results of criticality analysis NEDC-33931P.
Fuel reconstitution                          YES Section 4.0 of NEDC-33931P 12.0 Accident Analysis Boron dilution                                NO  Not applicable - No soluble boron Normal conditions                        credit in this BWR criticality analysis Accident conditions                      (NEDC-33931P)
Single assembly misload                      YES Section 5.5 of NEDC-33931P Fuel assembly misplacement                    YES Section 5.5 of NEDC-33931P Neutron Absorber Insert Misload              NO  Not applicable to this BWR analysis; no fuel assembly inserts in analysis NEDC-33931P.
Multiple fuel misloads                        NO  Uniform pool, single storage configuration, no opportunity for multiple misloads Dropped assembly                              YES Section 5.5 of NEDC-33931P Temperature                                  YES Section 5.4 of NEDC-33931P Seismic event/other natural phenomena        YES Section 5.5 of NEDC-33931P 13.0 Analysis Results and Conclusions Summary of results                            YES Section 7.0 of NEDC-33931P NO  Not applicable for BWR peak reactivity Burnup curve(s) analyses, including NEDC-33931P NO  Not applicable for BWR peak reactivity Intermediate Decay time treatment analyses, including NEDC-33931P YES Section 2.4 and Attachment 2 of LAR New administrative controls RS-21-064 YES Sections 2.3, 2.4 and Attachment 2 of Technical Specification markups LAR RS-21-064 14.0 References                              YES Section 8.0 of NEDC-33931P Appendix A: Computer Code Validation:            Appendix A of NEDC-33931P Code validation methodology and bases        YES Appendix A of NEDC-33931P New Fuel Depleted Fuel MOX HTC Convergence C-7
 
Trends Bias and uncertainty Range of applicability                YES Described in Section 3.4 of NEDC-33931P Analysis of Area of Applicability    YES Described in Section 3.4 of NEDC-coverage                                  33931P C-8}}

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