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Title page 1

Contents 5

ABSTRACT 4

EXECUTIVE SUMMARY 8

ABBREVIATIONS AND ACRONYMS 9

NOMENCLATURE 10

Subscripts 10

Superscripts 10

1. TEST DESCRIPTION 11

1.1. Experiment Layout 11

1.2. Initial and Boundary Conditions 12

1.3. List of Events 12

1.4. Test Results 12

2. RELAP5 INPUT MODEL 13

2.1. Injection Line 13

2.2. Pipe Model 14

2.2.1. Standpipe Region 14

2.2.2. Extra Gas Volume 15

2.2.3. Henry's Law Injection 15

2.3. Accum Model 16

3. RESULTS 17

3.1. Assessment of Run «2024-09-27-Pipe» 18

3.2. Comparison of Different Runs 21

4. CONCLUSIONS 23

5. REFERENCES 24

APPENDIX A. HENRY'S LAW 25

APPENDIX B. TEST RESULTS 26

APPENDIX C. RELAP5 NWITHAIR FIX 30

APPENDIX D. CALCULATION RESULTS - DATA 31

APPENDIX E. CALCULATION RESULTS - FIGURES 104

Tables 7

Table 3-1. Calculation Matrix 17

Table 3-2. Results for Run «2024-09-27-Pipe», Test #51 21

Figures 6

Figure 1-1. Hydroaccumulator Vessel [1] 11

Figure 1-2. Injection Line Until Orifice [1] 11

Figure 2-1. Injection Line Model 13

Figure 2-2. Pipe Model Nodalization 14

Figure 2-3. Accum Model Nodalization 16

Figure 3-1. Immediate Start After Pressurization for «2024-09-27-Pipe» 18

Figure 3-2. Delayed Start After Pressurization for «2024-09-27-Pipe» 19

Figure 3-3. Comparison of Cases for Run «2024-09-27-Pipe», Test #51 20

Figure 3-4. Comparing the Base Case Across Different Runs, Test #51 21