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Title page 1

Contents 5

ABSTRACT 4

EXECUTIVE SUMMARY 10

ACKNOLEDGMENTS 11

ABBREVIATIONS AND ACRONYMS 12

1. INTRODUCTION 13

2. COMPUTATION MODEL OF NPP KRŠKO 15

2.1. Nodalization Description 15

2.2. Evaluation of Steady State 20

3. ANALYSIS OF STEAM GENERATOR TUBE RUPTURE (SGTR) ACCIDENT FOR NPP KRŠKO 23

3.1. Analysis of SGTR Accident - Margin to Overfill (MTO) Calculation 23

3.2. Analysis of SGTR Accident - Thermal Hydraulic Conditions for Dose Calculation (THD) 38

4. CONCLUSIONS 60

5. REFERENCES 62

Tables 9

Table 1. Comparison Between NEK Reference Data and Calculated Steady State Data, MTO Analysis 21

Table 2. Comparison Between NEK Reference Data and Calculated Steady State Data, THD Analysis 22

Table 3. Time Sequence of the Main Events: SGTR, MTO Analysis 25

Table 4. Time Sequence of the Main Events: SGTR, THD Analysis 42

Figures 6

Figure 2-1. RELAP5/MOD3.3 Nodalization Scheme for NPP Krško 17

Figure 2-2. TRACE Nodalization Scheme for NPP Krško (Primary Circuit, with Broken SG Tube) 18

Figure 2-3. TRACE Model for NPP Krško (ECCS - Emergency Core Cooling System) 18

Figure 2-4. Steam Generator (SG 2) Model - TRACE 19

Figure 2-5. TRACE Nodalization: Main Feedwater and Auxiliary Feedwater System 19

Figure 2-6. TRACE Nodalization: SG 1 Secondary Side and Main Steam System 20

Figure 3-1. NEK SGTR, MTO BE Calculation, Break Mass Flow Rate 26

Figure 3-2. NEK SGTR, MTO SRP Calculation, Break Mass Flow Rate 26

Figure 3-3. NEK SGTR, MTO BE Calculation, Pressurizer and SG Pressure 27

Figure 3-4. NEK SGTR, MTO SRP Calculation, Pressurizer and SG Pressure 27

Figure 3-5. NEK SGTR, MTO Calculation, Nuclear Power 28

Figure 3-6. NEK SGTR, MTO BE Calculation, Hot Leg Temperature 28

Figure 3-7. NEK SGTR, MTO SRP Calculation, Hot Leg Temperature 29

Figure 3-8. NEK SGTR, MTO BE Calculation, Cold Leg Temperature 29

Figure 3-9. NEK SGTR, MTO SRP Calculation, Cold Leg Temperature 30

Figure 3-10. NEK SGTR, MTO BE Calculation, RCS Subcooling 30

Figure 3-11. NEK SGTR, MTO SRP Calculation, RCS Subcooling 31

Figure 3-12. NEK SGTR, MTO BE Calculation, Break Flow Vapor Fraction 31

Figure 3-13. NEK SGTR, MTO SRP Calculation, Break Flow Vapor Fraction 32

Figure 3-14. NEK SGTR, MTO BE Calculation, ECCS Flow 32

Figure 3-15. NEK SGTR, MTO SRP Calculation, ECCS Flow 33

Figure 3-16. NEK SGTR, MTO BE Calculation, Pressurizer Level 33

Figure 3-17. NEK SGTR, MTO SRP Calculation, Pressurizer Level 34

Figure 3-18. NEK SGTR, MTO BE Calculation, SG NR Level 34

Figure 3-19. NEK SGTR, MTO BE Calculation, AFW Flow 35

Figure 3-20. NEK SGTR, MTO SRP Calculation, SG NR Level 35

Figure 3-21. NEK SGTR, MTO SRP Calculation, AFW Flow 36

Figure 3-22. NEK SGTR, MTO Calculation, SG 1 Liquid Volume 36

Figure 3-23. NEK SGTR, MTO Calculation, Integrated SG 1 PORV Flow 37

Figure 3-24. NEK SGTR, MTO Calculation, SG 1 PORV Flow Void Fraction 37

Figure 3-25. NEK SGTR, MTO Calculation, Integrated SG 2 PORV Flow 38

Figure 3-26. NEK SGTR, THD BE Analysis, Break Mass Flow Rate, RELAP5 and TRACE (0-3000s) 43

Figure 3-27. NEK SGTR, THD BE Analysis, Pressurizer and SG Pressure, RELAP5 and TRACE (0-3000s) 44

Figure 3-28. NEK SGTR, THD BE Analysis, SG NR Level, ACE (0-3000s) 44

Figure 3-29. NEK SGTR, THD BE Analysis, Discharged SG 1 PORV Mass, RELAP5 and TRACE (0-3000s) 45

Figure 3-30. NEK SGTR, THD BE Analysis, Break Mass Flow Rate, RELAP5 and TRACE 45

Figure 3-31. NEK SGTR, THD SRP Analysis, Break Mass Flow Rate, and RELAP5 TRACE 46

Figure 3-32. NEK SGTR, THD BE Analysis, Pressurizer and SG Pressure, RELAP5 and TRACE 46

Figure 3-33. NEK SGTR, THD SRP Analysis, Pressurizer and SG Pressure, RELAP5 and TRACE 47

Figure 3-34. NEK SGTR, THD Analysis, Nuclear Power, RELAP5 and TRACE (0-1000s) 47

Figure 3-35. NEK SGTR, THD BE Analysis, Hot Leg Temperature, RELAP5 and TRACE 48

Figure 3-36. NEK SGTR, THD SRP Analysis, Hot Leg Temperature, RELAP5 and TRACE 48

Figure 3-37. NEK SGTR, THD BE Analysis, Cold Leg Temperature, RELAP5 and TRACE 49

Figure 3-38. NEK SGTR, THD SRP Analysis, Cold Leg Temperature, RELAP5 and TRACE 49

Figure 3-39. NEK SGTR, THD BE Analysis, RCS Average Temperature, RELAP5 and TRACE 50

Figure 3-40. NEK SGTR, THD SRP Analysis, RCS Average Temperature, RELAP5 and TRACE 50

Figure 3-41. NEK SGTR, THD Analysis, Core Exit Temperature, RELAP5 and TRACE 51

Figure 3-42. NEK SGTR, THD Analysis, RCS Subcooling, RELAP5 and TRACE 51

Figure 3-43. NEK SGTR, THD BE Analysis, Break Flow Vapor Fraction, RELAP5 and TRACE 52

Figure 3-44. NEK SGTR, THD SRP Analysis, Break Flow Vapor Fraction, RELAP5 and TRACE 52

Figure 3-45. NEK SGTR, THD Analysis, ECCS Flow, RELAP5 and TRACE 53

Figure 3-46. NEK SGTR, THD BE Analysis, CVCS Flow, RELAP5 and TRACE 53

Figure 3-47. NEK SGTR, THD SRP Analysis, CVCS Flow, RELAP5 and TRACE 54

Figure 3-48. NEK SGTR, THD BE Analysis, Pressurizer Level, RELAP5 and TRACE 54

Figure 3-49. NEK SGTR, THD SRP Analysis, Pressurizer Level, RELAP5 and TRACE 55

Figure 3-50. NEK SGTR, THD BE Analysis, SG NR Level, RELAP5 and TRACE 55

Figure 3-51. NEK SGTR, THD SRP Analysis, SG NR Level, RELAP5 and TRACE 56

Figure 3-52. NEK SGTR, THD, SG 1 Liquid Volume, RELAP5 and TRACE 56

Figure 3-53. NEK SGTR, THD BE Analysis, SG Mass, RELAP5 and TRACE 57

Figure 3-54. NEK SGTR, THD SRP Analysis, SG Mass, RELAP5 and TRACE 57

Figure 3-55. NEK SGTR, THD Analysis, Integrated SG 1 PORV Flow, RELAP5 and TRACE 58

Figure 3-56. NEK SGTR, THD Analysis, SG 1 PORV Flow Void Fraction 58

Figure 3-57. NEK SGTR, THD Analysis, Integrated SG 2 PORV Flow, RELAP5 and TRACE 59

Figure 3-58. NEK SGTR, THD Analysis, Integrated Pressurizer PORV Flow, RELAP5 and TRACE 59

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