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Title page 1

Contents 6

ABSTRACT 4

FOREWORD 5

EXECUTIVE SUMMARY 10

ABBREVIATIONS AND ACRONYMS 12

1. INTRODUCTION 14

2. DESCRIPTION OF ATLAS FACILITY 16

3. DESCRIPTION OF THE OECD-ATLAS2 B3.2 TEST 19

4. DESCRIPTION OF TRACE INPUT MODELS 23

4.1. Reactor Pressure Vessel 23

4.2. Pressurizer 24

4.3. Steam Generator 24

4.4. Intermediate Leg and Counter Current Flow Limitation Model 24

4.5. Break Piping System 24

4.6. Main Steam Safety Valve 25

4.7. Ransom-Trapp Model 25

4.8. Heat Loss 25

5. STEADY-STATE CALCULATION 29

6. RESULTS AND DISCUSSION 31

6.1. Sequence of Events 31

6.2. Transient Calculation 33

6.3. Sensitivity Studies 47

6.3.1. Break Size 47

6.3.2. Break Position 51

7. CONCLUSIONS 57

8. ACKNOWLEDGEMENTS 59

9. REFERENCES 60

Tables 9

Table 1-1. Summary of IBLOCA Experiments 15

Table 5-1. Results of Steady-State Calculation 30

Table 6-1. Sequence of Events 32

Table 6-2. Sensitivity Studies for Break Size 47

Table 6-3. Sensitivity Studies for Break Position 51

Figures 7

Figure 2-1. Schematic Diagram of Loop Connection of ATLAS 17

Figure 2-2. Three-Dimensional View of ATLAS 18

Figure 3-1. Location of the Break Unit and SI System 21

Figure 3-2. Isometric Drawing of the Break Flow Piping 22

Figure 4-1. Schematic Nodalization of TRACE for ATLAS2 B3.2 Test 26

Figure 4-2. Radial Rings of the Core 27

Figure 4-3. Azimuthal Sectors of the Core 27

Figure 4-4. Nodalization of Intermediate Leg 28

Figure 4-5. Nodalization of Break Piping System 28

Figure 6-1. Normal Core Power 33

Figure 6-2. Choking Flag 34

Figure 6-3. RPV and SG Pressures 35

Figure 6-4. Integrated Mass of Discharge Flow 36

Figure 6-5. Mass Flow Rate of SIPs 37

Figure 6-6. Mass Flow Rate of SITs 38

Figure 6-7. Collapsed Water Level in SG1 and SG2 39

Figure 6-8. Collapsed Water Level in SITs 40

Figure 6-9. Mass Flow Rate of Hot Legs 40

Figure 6-10. Mass Flow Rate of Cold Legs 41

Figure 6-11. Collapsed Water Level of Intermediate Legs 43

Figure 6-12. Maximum Cladding Temperature 44

Figure 6-13. Collapsed Water Level of Core and Downcomer 46

Figure 6-14. Cladding Temperature and Collapsed Water Level 46

Figure 6-15. Integrated Mass of DVI Discharge Flow at Different Break Sizes 48

Figure 6-16. RPV Pressure at Different Break Sizes 49

Figure 6-17. Integrated Mass of MSSV Discharge Flow at Different Break Sizes 49

Figure 6-18. Maximum Cladding Temperature at Different Break Sizes 50

Figure 6-19. Collapsed Water Level of the Core at Different Break Sizes 50

Figure 6-20. Integrated Mass of DVI Discharge Flow at Conservative Break Positions 53

Figure 6-21. RPV Pressure at Conservative Break Positions 53

Figure 6-22. Maximum Cladding Temperature at Conservative Break Positions 54

Figure 6-23. Collapsed Water Level of the Core at Conservative Break Positions 54

Figure 6-24. Integrated Mass of DVI Discharge Flow at Non-Conservative Break Positions 55

Figure 6-25. RPV Pressure at Non-Conservative Break Positions 55

Figure 6-26. Maximum Cladding Temperature at Non-Conservative Break Positions 56

Figure 6-27. Collapsed Water Level of the Core at Non-Conservative Break Positions 56

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