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Title page 1

Contents 5

ABSTRACT 4

EXECUTIVE SUMMARY 10

ACKNOWLEDGMENTS 11

ABBREVIATIONS 12

1. INTRODUCTION 14

2. BETHSY FACILITY, TEST, INPUT MODELS AND SIMULATED CASES DESCRIPTION 15

2.1. Bethsy Facility Description 15

2.2. Bethsy 4.1a TC Test Description 15

2.3. RELAP5 and TRACE Input Model Descriptions 16

2.4. Simulated Cases and Scenarios Description 19

3. RESULTS 22

3.1. Base Case Calculation Comparison Between Latest Released TRACE and RELAP5 22

3.2. Base Case Calculations Using Several TRACE and RELAP5 Versions for Main Variables 28

3.3. Uncertainty Cases Varying Primary Mass Inventory 43

3.4. Results Discussion 55

4. CONCLUSIONS 56

5. REFERENCES 57

Tables 9

Table 2-1. Mass Balance for BETHSY 4.1a Natural Circulation Test 20

Table 2-2. Base Case TRACE and RELAP5 Calculations for BETHSY 4.1a Natural Circulation Test 20

Table 2-3. Parametric Calculations with Latest TRACE V5.0 Patch 9 and RELAP5/MOD3.3 Patch 6 Calculations for BETHSY 4.1a Natural Circulation... 21

Table 2-4. Initial and Boundary Conditions 21

Table 3-1/Table 3-5. TRACE V5.0 Patch 9 Comparison to Group TRACE V5.0 Patches 5 Through 8 for Hot and Cold Leg Mass Flow Rates in the Loops 1 to 3 30

Table 3-2/Table 3-6. TRACE V5.0 Patch 9 Comparison to RELAP5/MOD3.3 Patch 6 for Hot and Cold Leg Mass Flow Rates in the Loops 1 to 3 31

Figures 6

Figure 2-1. BETHSY Facility Hydraulic Components View of RELAP5 17

Figure 2-2. BETHSY Facility Hydraulic Components View of TRACE 19

Figure 3-1. BETHSY 4.1a TC Simulations by TRACE and RELAP5 (Part 1 of 4) 24

Figure 3-2. BETHSY 4.1a TC Simulations by TRACE and RELAP5 (Part 2 of 4) 25

Figure 3-3. BETHSY 4.1a TC Simulations by TRACE and RELAP5 (Part 3 of 4) 26

Figure 3-4. BETHSY 4.1a TC Simulations by TRACE and RELAP5 (Part 4 of 4) 27

Figure 3-5. BETHSY 4.1a TC Comparison of TRACE and RELAP5 Hot Leg and Cold Leg Flow Rate in Loop 2 Calculations with Measured Data 28

Figure 3-6. Upper Plenum Pressure from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 32

Figure 3-7. Core Inlet Temperature from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 33

Figure 3-8. Core Outlet Temperature from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 34

Figure 3-9. Core Heated Length Differential Pressure from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions... 35

Figure 3-10. Rod Temperature (top) from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (Top),... 36

Figure 3-11. Hot Leg Flow Rate Loop 1 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 37

Figure 3-12. Cold Leg Flow Rate Loop 1 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 38

Figure 3-13. Hot Leg Flow Rate Loop 2 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 39

Figure 3-14. Cold Leg Flow Rate Loop 2 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 40

Figure 3-15. Hot Leg Flow Rate Loop 3 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 41

Figure 3-16. Cold Leg Flow Rate Loop 3 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 42

Figure 3-17. Upper Plenum Pressure from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) TRACE Primary Mass Variations (top),... 44

Figure 3-18. Core Inlet Temperature from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) TRACE Primary Mass Variations (top),... 45

Figure 3-19. Core Outlet Temperature from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) TRACE Primary Mass Variations (top),... 46

Figure 3-20. Core Heated Length Differential Pressure from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions... 47

Figure 3-21. Rod Temperature (top) from BETHSY 4.1a TC Test Calculations Compared with Measured data: (a) Different Versions of TRACE (top),... 48

Figure 3-22. Hot Leg Flow Rate Loop 1 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 49

Figure 3-23. Cold Leg Flow Rate Loop 1 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 50

Figure 3-24. Hot Leg Flow Rate Loop 2 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 51

Figure 3-25. Cold Leg Flow Rate Loop 2 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 52

Figure 3-26. Hot Leg Flow Rate Loop 3 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 53

Figure 3-27. Cold Leg Flow Rate Loop 3 from BETHSY 4.1a TC Test Calculations Compared with Measured Data: (a) Different Versions of TRACE (top),... 54

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