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Title page 1

Contents 5

ABSTRACT 4

ACKNOWLEDGMENTS 8

ABBREVIATIONS AND ACRONYMS 9

1. INTRODUCTION 11

2. PSB-VVER TEST FACILITY 12

3. CL-4.1-03 EXPERIMENT 14

4. TRACE MODELS 16

5. STEADY STATE EVALUATION 23

6. QUALITATIVE ASSESSMENT OF THE SIMULATION RESULTS 25

7. QUANTITATIVE ASSESSMENT OF THE SIMULATION RESULTS 36

8. CONCLUSIONS 40

9. REFERENCES 42

Tables 7

Table 4-1. Nodalization Difference of the Models in the RPV Section 16

Table 5-1. Steady-State Parameters 23

Table 6-1. Sequence of the Main Events in the Transient 25

Table 7-1. Accuracy Categories for FFTBM-SM and SARBM 36

Table 7-2. FFTBM-SM and SARBM Results for the Selected Parameters 37

Figures 6

Figure 2-1. Design of the PSB-VVER Test Facility 12

Figure 3-1. Break Unit in Test 3 of PSB-VVER 14

Figure 4-1. RPV Nodalization (Top: AZIM4, AZIM1; Bottom: PIPE) 17

Figure 4-2. Pressurizer Nodalization 19

Figure 4-3. Loop #4 with the Break Unit 20

Figure 4-4. Hydroaccumulator Models 21

Figure 4-5. Radial Sectors in the Bottom Part of SG Model (Figure From - Modified) 22

Figure 4-6. Secondary Side Nodalization 22

Figure 6-1. Primary Pressure Evolution 29

Figure 6-2. Integral Break Mass Flow 29

Figure 6-3. Pressure Vessel Water Level 30

Figure 6-4. Pressure Differential in the UP 30

Figure 6-5. Pressure Differential in the Core Section 31

Figure 6-6. Loop Seal #1 Differential Pressure 31

Figure 6-7. Loop Seal #4 Differential Pressure 32

Figure 6-8. Cladding Temperature (Top of FRS) 32

Figure 6-9. Water Level of Hydroaccumulator #4 33

Figure 6-10. Water Level of Hydroaccumulator #2 33

Figure 6-11. Downcomer Coolant Temperature 34

Figure 6-12. Upper Plenum Coolant Temperature 34

Figure 6-13. Secondary Side Pressure in SG #4 35

Figure 6-14. Water Level in SG #4 35