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Title page 1

Contents 5

ABSTRACT 4

EXECUTIVE SUMMARY 11

ACKNOWLEDGMENTS 12

ABBREVIATIONS AND ACRONYMS 13

1. INTRODUCTION 14

2. LOCA SCENARIO, INPUT MODEL AND SIMULATED CASES DESCRIPTION 15

2.1. LOCA Scenario Description 15

2.2. TRACE Input Model Description 15

2.3. Simulated LOCA Break Cases and Scenarios Description 16

3. RESULTS 18

3.1. LOCA Scenarios Together with Complete Loss of HPI 18

3.2. LOCA Scenarios Together with Complete Loss of LPI 33

3.3. LOCA Scenarios Together with Complete Loss of HPI - DEC Safety Feature Assumed 45

4. CONCLUSIONS 52

5. REFERENCES 53

Tables 10

Table 2-1. LOCA Scenarios Together with Complete Loss of HPI, Simulated by TRACE and Compared to RELAP5 Results From 2019 17

Table 2-2. LOCA Scenarios Together with Complete Loss of LPI, Simulated by TRACE and Compared to RELAP5 Results From 2019 17

Figures 6

Figure 2-1. TRACE Two-Loop PWR Hydraulic Components View 16

Figure 3-1. Primary Pressure Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete HPI Loss 19

Figure 3-2. Steam Generator No.1 Pressure Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete HPI Loss 20

Figure 3-3. Break Flow Rate Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete HPI Loss 20

Figure 3-4. Break Mass Flow Rate Integral Comparison between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete HPI Loss 21

Figure 3-5. Accumulator No.1 Mass Flow Rate Comparison between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete HPI Loss 21

Figure 3-6. LPSI Injected Mass Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete HPI Loss 22

Figure 3-7. Primary Mass Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete HPI Loss 22

Figure 3-8. Collapsed Core Liquid Level Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete HPI Loss 23

Figure 3-9. Rod Cladding Temperature Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete HPI Loss 23

Figure 3-10. Primary Pressure Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete HPI Loss 24

Figure 3-11. Steam Generator No.1 Pressure Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete HPI Loss 24

Figure 3-12. Break Flow Rate Comparison Between TRACE and RELAP5 10.16 cm for (4 inch) and 15.24 cm (6 inch) Break Size - Complete HPI Loss 25

Figure 3-13. Break Flow Rate Integral Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete HPI Loss 25

Figure 3-14. Accumulator No.1 Flow Rate Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete HPI Loss 26

Figure 3-15. LPSI Injected Mass Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete HPI Loss 26

Figure 3-16. Primary Mass Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete HPI Loss 27

Figure 3-17. Collapsed Core Liquid Level Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete HPI Loss 27

Figure 3-18. Rod Cladding Temperature Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete HPI Loss 28

Figure 3-19. Primary Pressure Comparison Between TRACE and RELAP5 for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete HPI Loss 28

Figure 3-20. Steam Generator No.1 Pressure Comparison Between TRACE and RELAP5 for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete HPI Loss 29

Figure 3-21. Break Flow Rate Comparison Between TRACE and RELAP5 10.16 cm for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete HPI Loss 29

Figure 3-22. LPI Injection Comparison Between TRACE and RELAP5 10.16 cm for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete HPI Loss 30

Figure 3-23. Break Flow Rate Integral Comparison Between TRACE and RELAP5 for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete HPI Loss 30

Figure 3-24. Accumulator No.1 Flow Rate Comparison Between TRACE and RELAP5 for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete HPI Loss 31

Figure 3-25. Primary Mass Comparison Between TRACE and RELAP5 for 10.16 cm 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete HPI Loss 31

Figure 3-26. Collapsed Core Liquid Level Comparison Between TRACE and RELAP5 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete HPI Loss 32

Figure 3-27. Rod Cladding Temperature Comparison Between TRACE and RELAP5 for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete HPI Loss 32

Figure 3-28. Primary Pressure Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete LPI Loss 33

Figure 3-29. Steam Generator No.1 Pressure Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete LPI Loss 34

Figure 3-30. Break Flow Rate Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete LPI Loss 34

Figure 3-31. Break Flow Rate Integral Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete LPI Loss 35

Figure 3-32. Accumulator No.1 Flow Rate Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete LPI Loss 35

Figure 3-33. Primary Mass Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete LPI Loss 36

Figure 3-34. Collapsed Core Liquid Level Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete LPI Loss 36

Figure 3-35. Rod Cladding Temperature Comparison Between TRACE and RELAP5 for 5.08 cm (2 inch) and 7.62 cm (3 inch) Break Size - Complete LPI Loss 37

Figure 3-36. Primary Pressure Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete LPI Loss 37

Figure 3-37. Steam Generator No.1 Pressure Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete LPI Loss 38

Figure 3-38. Break Flow Rate Comparison Between TRACE and RELAP5 10.16 cm for (4 inch) and 15.24 cm (6 inch) Break Size - Complete LPI Loss 38

Figure 3-39. Break Flow Rate Integral Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete LPI Loss 39

Figure 3-40. Accumulator No.1 Flow Rate Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete LPI Loss 39

Figure 3-41. Primary Mass Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete LPI Loss 40

Figure 3-42. Collapsed Core Liquid Level Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete LPI Loss 40

Figure 3-43. Rod Cladding Temperature Comparison Between TRACE and RELAP5 for 10.16 cm (4 inch) and 15.24 cm (6 inch) Break Size - Complete LPI Loss 41

Figure 3-44. Primary Pressure Comparison Between TRACE and RELAP5 for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete LPI Loss 41

Figure 3-45. Steam Generator No.1 Pressure Comparison Between TRACE and RELAP5 for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete LPI Loss 42

Figure 3-46. Break Flow Rate Comparison Between TRACE and RELAP5 10.16 cm for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete LPI Loss 42

Figure 3-47. Break Flow Rate Integral Comparison Between TRACE and RELAP5 for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete LPI Loss 43

Figure 3-48. Accumulator No.1 Flow Rate Comparison Between TRACE and RELAP5 for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete LPI Loss 43

Figure 3-49. Primary Mass Comparison Between TRACE and RELAP5 for 10.16 cm 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete LPI Loss 44

Figure 3-50. Collapsed Core Liquid Level Comparison Between TRACE and RELAP5 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete LPI Loss 44

Figure 3-51. Rod Cladding Temperature Comparison Between TRACE and RELAP5 for 20.32 cm (8 inch) and 30.48 cm (12 inch) Break Size - Complete LPI Loss 45

Figure 3-52. Primary Pressure Comparison for TRACE Scenario Without and with DEC Safety Feature - 5.08 cm (2 inch) Break Size with Complete HPI Loss 46

Figure 3-53. Break Flow Rate Comparison for TRACE Scenario Without and with DEC Safety Feature - 5.08 cm (2 inch) Break Size with Complete HPI Loss 46

Figure 3-54. Break Flow Rate Integral for TRACE Scenario Without and with DEC Safety Feature - 5.08 cm (2 inch) Break Size with Complete HPI Loss 47

Figure 3-55. Primary Mass Comparison for TRACE Scenario Without and with DEC Safety Feature - 5.08 cm (2 inch) Break Size with Complete HPI Loss 47

Figure 3-56. Collapsed Core Liquid Level for TRACE Scenario Without and with DEC Safety Feature - 5.08 cm (2 inch) Break Size with Complete HPI Loss 48

Figure 3-57. Rod Cladding Temperature for TRACE Scenario Without and with DEC Safety Feature - 5.08 cm (2 inch) Break Size with Complete HPI Loss 48

Figure 3-58. Primary Pressure Comparison for TRACE Scenario Without and with DEC Safety Feature - 7.62 cm (3 inch) Break Size with Complete HPI Loss 49

Figure 3-59. Break Flow Rate Comparison for TRACE Scenario Without and with DEC Safety Feature - 7.62 cm (3 inch) Break Size with Complete HPI Loss 49

Figure 3-60. Break Flow Rate Integral for TRACE Scenario Without and with DEC Safety Feature - 7.62 cm (3 inch) Break Size with Complete HPI Loss 50

Figure 3-61. Primary Mass Comparison for TRACE Scenario Without and with DEC Safety Feature - 7.62 cm (3 inch) Break Size with Complete HPI Loss 50

Figure 3-62. Collapsed Core Liquid Level for TRACE Scenario Without and With DEC Safety Feature - 7.62 cm (3 inch) Break Size With Complete HPI Loss 51

Figure 3-63. Rod Cladding Temperature for TRACE Scenario Without and with DEC Safety Feature - 7.62 cm (3 inch) Break Size with Complete HPI Loss 51

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