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Title page 1

Contents 5

ABSTRACT 4

ABBREVIATIONS AND ACRONYMS 8

1. INTRODUCTION 10

1.1. Background 10

1.2. Objectives 10

2. PHENOMENA IDENTIFICATION AND RANKING METHODOLOGY 12

2.1. Technological Scope and Licensing Events Outline 12

2.2. PIRT Elicitation Process Outline 13

2.3. PIRT Generation Approach 13

3. PHENOMENA IDENTIFICATION AND RANKING TABLES 16

3.1. PIRT on High Burnup FFRD and Its Consequences for Whole-Core Thermal Events 16

3.1.1. High Burnup FFRD PIRT for Whole-Core Thermal Events (Loss-of-Coolant Accidents) 16

3.1.2. Summary of Panel Discussions 28

3.1.3. Key LOCA PIRT Panel Considerations 37

3.2. PIRT on High Burnup FFRD and Its Consequences for Local Core Events 41

3.2.1. High Burnup FFRD PIRT for Local Core Events (RIAs) 41

3.2.2. Summary of Panel Discussions 43

3.2.3. Key RIA PIRT Panel Considerations 45

3.3. PIRT on High Burnup FFRD and Its Consequences for Fuel Handling Accidents 48

3.3.1. High Burnup FFRD PIRT for Fuel Handling Accidents 48

3.3.2. Summary of Panel Notes 49

3.3.3. Summary of Panel Deliberation Insights 50

3.3.4. Key FHA PIRT Panel Considerations 51

4. SUMMARY AND CONCLUSIONS 52

4.1. Major Outcomes from the FFRD PIRT Panel Effort 52

4.1.1. FFRD PIRT Outcomes Related to Loss-of-Coolant Accidents 54

4.1.1.1. Phenomena Developing in the Fuel and Cladding as Burnup Increases during Operation 55

4.1.1.2. Consequences for Outside of the Fuel Rod 55

4.1.1.3. LOCA PIRT Figure of Merit-Related Considerations 56

4.1.2. FFRD PIRT Outcomes Related to Reactivity-Initiated Accidents 58

4.1.3. FFRD PIRT Outcomes Related to Fuel Handling Accidents 59

4.2. Main FFRD Implications and Proposed Next Steps 60

5. REFERENCES 63

APPENDIX A. FUEL FRAGMENTATION, RELOCATION, AND DISPERSAL PHENOMENA IDENTIFICATION AND RANKING TABLE EXPERT PANEL MEMBERS 65

APPENDIX B. FUEL FRAGMENTATION, RELOCATION, AND DISPERSAL PHENOMENA IDENTIFICATION AND RANKING TABLE ON HIGH BURNUP FFRD... 70

APPENDIX C. FUEL FRAGMENTATION, RELOCATION, AND DISPERSAL PHENOMENA IDENTIFICATION AND RANKING TABLE ON HIGH BURNUP FUEL... 111

APPENDIX D. FUEL FRAGMENTATION, RELOCATION, AND DISPERSAL PHENOMENA IDENTIFICATION AND RANKING TABLE ON HIGH BURNUP FUEL... 132

Tables 7

Table 3-1. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 1, "Fuel Initial Conditions" 17

Table 3-2. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 2, "Transient Power Distribution" 19

Table 3-3. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 3, "Transient/Steady-State Heat Transfer from Cladding... 20

Table 3-4. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 4, "Transient Core Coolant Conditions" 21

Table 3-5. High Burnup FFRD PIRT on Whole-Core Thermal DBAs (LOCAs) for Phenomena Category 5, "Fuel Rod Transient Response" 22

Table 3-6. High Burnup FFRD Summary PIRT on Whole-Core Thermal Events for Phenomena Category 6, "Fuel Dispersal" 25

Table 3-7. High Burnup FFRD Summary PIRT on Whole-Core Thermal Events for Phenomena Category 7, "Multiple Rod Effects-Mechanical" 26

Table 3-8. High Burnup FFRD Summary PIRT on Whole-Core Thermal Events for Phenomena Category 8, "Multiple Rod Effects-Thermal" 26

Table 3-9. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 9, "Dispersed Fuel Transport and Its Consequences" 27

Table 3-10. PIRT on High Burnup FFRD and Its Consequences for Local Core Events (RIAs) 42

Table 3-11. PIRT on High Burnup FFRD and Its Consequences for FHAs 48

Appendix Tables 71

Table B-1. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 1, "Fuel Initial Conditions" 71

Table B-2. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 2, "Transient Power Distribution" 77

Table B-3. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 3, "Transient / Steady-state Heat Transfer from Cladding... 79

Table B-4. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 4, "Transient Core Coolant Conditions" 82

Table B-5. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 5, "Fuel Rod Transient Response" 85

Table B-6. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 6, "Fuel Dispersal" 94

Table B-7. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 7, "Multiple Rod Effects-Mechanical" 98

Table B-8. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 8, "Multiple Rod Effects-Thermal" 101

Table B-9. High Burnup FFRD PIRT on Whole-Core Thermal Events for Phenomena Category 9, "Dispersed Fuel Transport and Its Consequences" 104

Table C-1. PIRT on High Burnup FFRD and Its Consequences for Local Core Events (RIAs) with Panel Votes 112

Table D-1. PIRT on High Burnup FFRD and Its Consequences for FHAs with Panel Votes 133

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