v
CONTENTS
ACKNOWLEDGEMENTS... i
RESUMO ... ii
SOMMARIO ... iii
ABSTRACT... iv
CONTENTS... v
ABBREVIATIONS ... vii
LIST OF TABLES ... x
LIST OF FIGURES ... xi
Chapter 1 – INTRODUCTION ... 1
Chapter 2 – OVERVIEW OF 3D-NK-TH COUPLED CODES METHODOLOGY ... 3
2.1. COUPLED CODES APPROACH... 3
2.2. FIELDS OF APPLICATION... 5
2.3. COUPLED COMPUTATIONAL TOOLS REQUIRED. ... 6
2.4. COUPLING PROCESSES... 8
2.5. NEUTRONIC/THERMAL-HYDRAULIC NODALIZATION REQUIREMENTS... 11
Chapter 3 – REFERENCE PLANT DESCRIPTION & ROD EJECTION ACCIDENT……..…13
3.1. REFERENCE PLANT DESCRIPTION... 13
3.1.1. TERMAL-HYDRAULIC DATA... 13
3.1.2. CORE AND NEUTRONIC DATA... 20
3.2. CONTROL ROD EJECTION ACCIDENT... 27
Chapter 4 – CODES AND PLANT MODELLING ... 30
4.1. INTRODUCTION... 30
4.2. ADOPTED COMPUTATIONAL CODES... 30
4.2.1. RELAP5/ MOD 3.3 ... 30
4.2.2. PARCS ... 31
4.2.3. RELAP5/3D ... 33
4.2.4. NESTLE... 34
vi
4.3. COUPLING PROCESSES USED ... 38
4.3.1. RELAP/PARCS... 38
4.3.2. RELAP 5/3D – NESTLE ... 39
4.4. THERMAL-HYDRAULIC MODELLING... 40
4.5. 3D NEUTRON KINETIC MODELLING ... 45
4.6. CONTROL ROD WORTH CALCULATION... 48
Chapter 5 – DISCUSSION OF ACHIEVED RESULTS... 52
5.1 PROCEDURE AND LIST OF PERFORMED CALCULATIONS ... 52
5.2 STEADY-STATE CALCULATION ... 54
5.3 TRANSIENT CALCULATION ... 61
5.3.1 HZP – 1 CONTROL ROD EJECTION... 62
5.3.2 HZP – COLLAPSED CONTROL ROD EJECTION ... 72
5.3.3 HFP – CONTROL ROD 40% EJECTION ... 87
Chapter 6 – CONCLUSIONS ... 98
REFERENCES... 100
