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Title page 1

Contents 6

ABSTRACT 4

FOREWORD 5

EXECUTIVE SUMMARY 9

ABBREVIATIONS AND ACRONYMS 10

1. INTRODUCTION 11

2. MODEL AND METHODOLOGY DESCRIPTION 12

2.1. Maansan RELAP5/SNAP Model Description 12

2.2. Analysis Methodology Description 13

3. THE ANALYSIS RESULTS OF THE CASES 19

3.1. The Results of Maanshan RELAP5 Flex Model (Base Case) 19

3.2. Comparison of RELAP5 and TRACE Analysis Results 25

3.3. Maanshan RELAP5 FLEX Sensitivity Analysis 29

3.4. Maanshan RELAP5 FLEX Strategy Enhancement 31

4. CONCLUSION 33

5. REFERENCES 34

Tables 8

Table 2-1. Initial Conditions of Maanshan NPP 17

Table 2-2. Sequence of Events in FLEX 18

Table 2-3. The Steady State Verification Results 18

Table 3-1. Case A Sequence of Event for Maanshan FLEX Model 20

Table 3-2. Case B Sequence of Event for RELAP5 and TRACE Comparison 26

Table 3-3. Case C Sequence of Event 29

Table 3-4. Case C Rescue Operation Schedule 30

Table 3-5. Westinghouse Reflux Cooling Definition 31

Table 3-6. Case D Reflux Cooling Sequence of Event 32

Table 3-7. Case D Reflux Cooling Depressurization or Not Comparison 32

Figures 7

Figure 2-1. The RELAP5/SNAP Model of Maanshan NPP Primary Side 13

Figure 2-2. The RELAP5/SNAP Model of Maanshan NPP Secondary Side 14

Figure 2-3. TDAFW Flow 15

Figure 2-4. FLEX High Pressure Injection Flow 15

Figure 2-5. FLEX Medium Pressure Injection Flow 16

Figure 2-6. WCAP-17601-P Cooling Rate Specification 16

Figure 3-1. Case A Secondary Side Pressure 21

Figure 3-2. Case A Primary Side Pressure 22

Figure 3-3. Case A RCP Seal Leakage 22

Figure 3-4. Case A Hot Leg Temperature 23

Figure 3-5. Case A RCS Water Level 23

Figure 3-6. Case A Cladding Temperature 24

Figure 3-7. Case B Primary & Secondary Side Pressure 27

Figure 3-8. Case B SG Water Level 27

Figure 3-9. Case B RCS Water Level 28

Figure 3-10. Case B RCP Seal Leakage 28

Figure 3-11. Core Water Level 30

Figure 3-12. Cladding Temperature 31

Figure 3-13. Case D Reflux Cooling Time 32