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Title page 1

Contents 6

ABSTRACT 4

FOREWORD 5

EXECUTIVE SUMMARY 9

NOMENCLAUTRE 10

1. INTRODUCTION 11

2. DESCRIPTION OF ASSESSMENT MODELS 12

2.1. GE 3X3 12

2.2. PSBT Bundle 16

3. RESULTS AND DISCUSSION 20

3.1. Assessment Results 20

3.1.1. GE 3X3 20

3.1.2. PSBT Bundle 27

3.2. Key Findings from the Assessment 38

4. CONCLUSIONS 42

5. REFERENCES 43

Tables 8

Table 2-1. Specification of GE 3X3 Test Section 14

Table 2-2. Specification of the Assessment Models for GE 3X3 Test 15

Table 2-3. Specification of PSBT Bundle Test Section 18

Table 2-4. Specification of Assessment Models For PSBT Bundle Test 19

Table 3-1. Test Cases of the GE 3X3 Experiment 21

Table 3-2. Root Mean Square Error of the GE 3X3 Calculation by System Codes 22

Table 3-3. Root Mean Square Error of PSBT Calculation by System Codes 30

Table 3-4. Comparison of Interfacial Drag Models in Both System Codes 32

Table 3-5. Change of the Root Mean Square Error Results with Interfacial Drag Models for PSBT Calculation 34

Table 3-6. Power-to-Flow Ratio Conditions at the Measured Subchannels of the GE 3X3 Experiment 39

Table 3-7. Change of the Root Mean Square Error Results with Crossflow Improvement 41

Figures 7

Figure 1-1. Rod Bundle Cross-Section After PHEBUS LOCA Experiment 11

Figure 2-1. Schematic Diagram of GE 3X3 Test Facility 13

Figure 2-2. Schematic Diagram of PSBT Bundle Test Facility 17

Figure 3-1. Calculated Results of the GE3X3 Test - Equilibrium Quality 21

Figure 3-2. Calculated Results of the GE3X3 Test - Mass Flux 22

Figure 3-3. Results Comparison - Axial Distribution of Void Fraction and Vapor Crossflow Velocity at the Corner (Low and High Flow Conditions... 23

Figure 3-4. Results Comparison - Axial Distribution of Void Fraction and Vapor Crossflow Velocity at the Corner (Low and High Flow Conditions... 24

Figure 3-5. Results Comparison - Net Vapor Generation Rate at the Corner 25

Figure 3-6. Results Comparison - 4x4 Subchannels with the Same Geometry and Boundary Conditions 26

Figure 3-7. Calculated Results of PSBT Bundle Test - Void Fraction 30

Figure 3-8. Results Comparison - Void Distribution Over the Cross-Section of Test Section 31

Figure 3-9. Results Comparison - Vapor Crossflow Velocity at the Central Channels 31

Figure 3-10. Results Comparison - Interfacial Friction Coefficient at the Crossflow Junctions of Central Channels 32

Figure 3-11. Results Comparison - Change of Void Prediction with TRACE Drag Model Interfacial 33

Figure 3-12. Results Comparison - without Restriction on Interfacial Friction For Crossflow Junctions Using TRACE Interfacial Drag Model 34

Figure 3-13. Results Comparison - Fluid Properties Used in Drift Flux Model of TRACE 35

Figure 3-14. Results Comparison - Annular-Mist Interfacial Friction Model of TRACE 36

Figure 3-15. Results Comparison - Drop Drag Model of TRACE 37

Figure 3-16. Results Comparison - GE 3X3 Quality Distribution 39

Figure 3-17. Influence of Crossflow Improvement by Subchannel Mixing Model - GE 3X3 Experiment 40

Figure 3-18. Influence of Crossflow Improvement by Subchannel Mixing Model - PSBT Bundle Experiment 40

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