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Title page 1

Contents 7

ABSTRACT 4

FOREWORD 5

EXECUTIVE SUMMARY 10

ACKNOWLEDGMENTS 11

ABBREVIATIONS AND ACRONYMS 12

1. INTRODUCTION 13

2. INITIAL AND BOUNDARY CONDITIONS 14

2.1. Description of the PKL Facility 14

2.1.1. Main Emergency Cooling, Waste Heat Removal and Pressure Relief Systems of the PKL Facility 16

2.2. Type of Transient. Description and Characteristics of the Test 19

2.2.1. General Characteristics of a Station Blackout (SBO) 19

2.2.2. Specifications of the Transient Under Study 19

3. TRACE MODEL OF PKL 24

3.1. Nodalization of Main Components 24

3.2. Global Characteristics of the Model 27

4. GUIDELINES FOR MODELING AND UNCERTAINTY ANALYSIS 29

5. TEST RESULTS AND COMPARISON WITH TRACE 31

5.1. Conditioning Phase 31

5.1.1. Test H2.2 Run 2 33

6. CONCLUSIONS 43

7. REFERENCES 44

Tables 9

Table 2-1. Initial Conditions of Test H2.2 Run 2 21

Table 2-2. Sequence of Relevant Events Throughout H2.2 Run 2 Test 23

Figures 8

Figure 2-1. PKL Integral Installation Schematic: (1) Reactor Vessel; (2) Downcomer; (3) Steam Generators; (4) Pumps; (5) Pressurizer.... 15

Figure 2-2. Pressurizer Relief Line 18

Figure 2-3. Expected Evolution of the PKL Installation During the Refurbishment Phase 20

Figure 2-4. Predicted Evolution of the PKL System During the Test H2.2 Run 2 21

Figure 3-1. Nodalization of the PKL Model Vessel 24

Figure 3-2. Nodalization of the PKL Model Pressurizer 25

Figure 3-3. Nodalization of the PKL Model Loops 26

Figure 3-4. Nodalization of the PKL Model SGs 27

Figure 3-5. Complete Hydraulic Model of the PKL System at TRACE 28

Figure 5-1. Evolution of the Level of the Steam Generators in the Conditioning Phase 32

Figure 5-2. Evolution of Core Exit Temperature in the Conditioning Phase 32

Figure 5-3. Pressure Evolution in the Secondary Circuit in the Conditioning Phase 33

Figure 5-4. Core Power Evolution 37

Figure 5-5. Pressure Evolution in the Upper Plenum 37

Figure 5-6. Core Exit Temperature Evolution 38

Figure 5-7. Peak Cladding Temperature 38

Figure 5-8. Evolution of the Core Level 39

Figure 5-9. Evolution of Loop 1 Accumulator Level 39

Figure 5-10. Evolution of the Pressurizer Level 40

Figure 5-11. Pressurizer Discharge Mass 40

Figure 5-12. Pressure Evolution in the Secondary Circuit 41

Figure 5-13. Level Evolution in Steam Generator 1 41

Figure 5-14. Temperature Evolution in the Upper Zone of Steam Generator 1 42

Figure 5-15. Temperature Evolution in the Lower Zone of the Steam Generator 1 42