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Title page 1

Contents 6

ABSTRACT 4

FOREWORD 5

EXECUTIVE SUMMARY 9

ABBREVIATIONS AND ACRONYMS 11

1. INTRODUCTION 13

2. DESCRIPTION OF THE ATLAS TEST 14

2.1. ATLAS Experimental Facility 14

2.2. Test Condition 16

3. CODE MODELING AND PRELIMINARY ANALYSIS 18

3.1. Description of Code Modeling 18

3.2. Results of RPV UH Node Sensitivity Analysis 23

4. RESULTS OF THE 3D MODEL 26

4.1. Steady State Results 26

4.2. Transient Results 28

5. CONCLUSIONS 38

6. REFERENCES 39

Tables 8

Table 2-1. Major Scaling Parameters of ATLAS 15

Table 4-1. Steady State Results 27

Table 4-2. 3D Chronology of the Transient Main Events 31

Table 4-3. Results of the FFTBM Analysis 37

Figures 7

Figure 2-1. Schematic Diagram of the ATLAS Facility 16

Figure 2-2. Drawing of Installation Scheme of Break Line Simulation 17

Figure 3-1. ATLAS 1D Model Nodalization 20

Figure 3-2. Information of ATLAS 3D RPV Model 20

Figure 3-3. Renodalization of RPV UH 21

Figure 3-4. Break Module for ATLAS CRDM Nozzle Break 21

Figure 3-5. Comparison of Secondary System Heat Loss 22

Figure 3-6. Pressure of the Primary System According to Node Number (MARS-KS 1D) 24

Figure 3-7. Pressure of the Primary System According to Node Number (TRACE 1D) 24

Figure 3-8. PCT According to Node Number (MARS-KS 1D) 25

Figure 3-9. Comparison of the Secondary System Heat Loss (TRACE 1D) 25

Figure 4-1. Comparison of the Volumes for RPV with MultiD and Vessel Components 28

Figure 4-2. Power of the Core Heater (3D) 32

Figure 4-3. Integrated Break Flow (3D) 32

Figure 4-4. Pressure of the Primary System (3D) 33

Figure 4-5. Active Core Collapsed Water Level (3D) 33

Figure 4-6. Peak Cladding Temperature (3D) 34

Figure 4-7. RCP Side IL Collapsed Water Level of Experiment 34

Figure 4-8. RCP Side IL Collapsed Water Level of MARS-KS (3D) 35

Figure 4-9. RCP Side IL Collapsed Water Level of TRACE (3D) 36

Figure 4-10. Active Core Collapsed Water Level and PCT (1,500~2,500 Sec) 36