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Title page 1

Contents 7

ABSTRACT 4

FOREWORD 5

EXECUTIVE SUMMARY 11

ABBREVIATIONS AND ACRONYMS 12

1. INTRODUCTION 14

1.1. CCFL Phenomenology and Modelling 15

1.2. The NEA/OECD ROSA 2 Project 17

1.3. LSTF Facility 18

2. THE ROSA/LSTF RELAP5 NODALIZATION 20

2.1. Reactor Pressure Vessel (RPV) 21

2.2. Steam Generators 23

2.3. Pressurizer 23

2.4. Primary Loop Piping 23

2.5. LSTF Heat Structures 24

3. IBLOCA EXPERIMENTS AND RESULTS 25

3.1. Test 1, Surge Line Break (17%) 25

3.2. Test 2, ECCS Line Break (17%) 30

3.3. Test 7, ECCS Line Break (13%) 35

4. SPECIFIC PHENOMENOLOGY 38

4.1. Possible Locations for CCFL Phenomenon (Hot Leg Break) 38

4.2. Possible Locations for CCFL Phenomenon (Cold Leg Break) 38

4.3. Breaking of the Top Core CCFL through CRGT Lateral Holes 39

5. MODELLING GUIDELINES 41

5.1. 3D Representation of the Core, UP and CRGTs 41

5.2. CCFL Locations 42

5.3. Break Modelling 44

6. CONCLUSIONS 45

7. REFERENCES 46

Tables 10

Table 2-1. Main Features of UPC RELAP5 LSTF Nodalization 21

Table 3-1. Control Logic of the Test 1 Experiment 25

Table 3-2. Chronology of the Main Events in Test 1 26

Table 3-3. Control Logic of the Test 2 Experiment 30

Table 3-4. Chronology of the Main Events in Test 2 31

Table 3-5. Control Logic of Test 7 Experiment 35

Table 3-6. Chronology of the Main Events in Test 7 36

Table 5-1. CCFL Location and Parameters Used in the Present Analysis 42

Table 5-2. CCFL Location and Parameters Recommended for TRACE 43

Figures 8

Figure 1-1. LSTF Test Facility (Courtesy of the OECD/NEA ROSA-2 Group) 19

Figure 2-1. UPC RELAP5 Nodalization of ROSA/LSTF 20

Figure 2-2. UPC RELAP5 RPV Nodalization 21

Figure 2-3. UPC RELAP5 LSTF Nodalization: Cartesian Distribution 22

Figure 3-1. UPC Results of the ROSA Test 1, a Full Rupture of the Surge Line Connected to the Hot Leg (Equivalent to 17% of the Cold Leg) 27

Figure 3-2. Schematic Evolution of the IBLOCA Scenario in the Hot Leg: Initial Conditions 28

Figure 3-3. Schematic Evolution of the IBLOCA Scenario in the Hot Leg: the High-Pressure Difference at the Break Leads the Coolant towards... 28

Figure 3-4. Schematic Evolution of the IBLOCA Scenario in the Hot Leg: When Break Flow Switches to Mostly Steam, High Primary... 29

Figure 3-5. Schematic Evolution of the IBLOCA Scenario in the Hot Leg: with Accs Injecting Cold Water, Pressure is Locally Reduced... 29

Figure 3-6. UPC Results of the ROSA Test 2, a Full Rupture of the ECC Line Connected to the Cold Leg (Equivalent to 17% of the Cold Leg) 32

Figure 3-7. Schematic Evolution of the IBLOCA Scenario in the Cold Leg: Initial Conditions 33

Figure 3-8. Schematic Evolution of the IBLOCA Scenario in the Cold Leg: The Accumulator in the Broken Loop Empties to the Containment,... 33

Figure 3-9. Schematic Evolution of the IBLOCA Scenario in the Cold Leg: The Steam Accumulated in the UP to U-Tubes Region Pushes... 34

Figure 3-10. Schematic Evolution of the IBLOCA Scenario in the Cold Leg: Once all LSs Have Been Cleared, the Break Flow Switches to Single... 34

Figure 3-11. UPC Results of the ROSA Test 7, a Full Rupture of the ECC Line Connected to the Cold Leg (Equivalent to 13% of the Cold Leg) 37

Figure 4-1. Schematic Description of the Possible CCFL Locations during an IBLOCA at the Hot Leg 38

Figure 4-2. Schematic Description of the Possible CCFL Locations during an IBLOCA at the Cold Leg 39

Figure 4-3. Schematic Description of the Break-up of the CCFL Phenomenon at the Upper Core Plate 40

Figure 5-1. Core and UP Levels during Test 7, Simulation of the Experiment with and without Lateral Holes in the CRGTs 41

Figure 5-2. Break Fow and Integrated Break Flow during Test 7, Simulation of the Experiment with Different Break Nozzle Length 44

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