SCDAP/RELAP5/MOD3.1 code manual

NUREG/CR-6150......Page 9
ACRONYMS......Page 16
1 INTRODUCTION......Page 17
1.3 Quality Assurance......Page 18
Organization of Volume I1......Page 19
2.2 Finite Difference......Page 20
The Alternating Direction Implicit Method......Page 22
2.4 Matrix Methods......Page 23
2.5 OECR Algorithm......Page 25
2.6 Volume Averaging......Page 26
Parabolic Rate Equation......Page 27
Enhanced Oxidation Due to Shattering of Oxidized Fuel Rod Cladding......Page 30
Electrical Heat Generation Model for Fuel Rod Component......Page 36
Release Model for Intact Fuel......Page 37
Enthalpy of Released Gases......Page 45
Decay Heat Reduction due to Fission Product Release......Page 48
Fission Product Decay Heat Model Results......Page 49
Melting and solidification geometry......Page 52
Sausage Deformation Model......Page 53
Localized Deformation Model......Page 57
Fuel Rod Internal Gas Pressure Model......Page 58
Correlations for Void Volumes for Standard PWR and BWR Fuel......Page 59
Corrections in Void Volumes Due to Variation from Standard Design......Page 70
correction factor Kp......Page 71
Simplifying assumptions in LIQSOL model......Page 77
Breach of Cladding Oxide Layer......Page 79
Configuration and Relocation of Liquefied Zr-U-0......Page 80
Liquefaction of Fuel Rod Cladding at Location of Inconel Grid Spacer......Page 92
Configuration of grid spacer......Page 93
Liquefaction of Cladding at Location of Grid Spacers......Page 94
new contact during time step......Page 107
that slumped from above......Page 109
Content of model for oxidation of porous debris......Page 110
4.9.3 Model Implementation......Page 114
Control Rod Material Interaction......Page 115
Binary alloy phase diagram of the system Fe Zr......Page 117
Arrangement of fuel assemblies and control blade in typical BWR core......Page 119
hemon......Page 120
5.2.5 Oxidation Models......Page 121
5.2.7 Hydrodynamic Models......Page 123
BWR bladebox model......Page 124
5.3.1 Model Description......Page 125
Nodalization for fuel assemblies and control rods......Page 126
B4C oxidation rate coefficient as a function of temperature......Page 127
Incompressible viscous film flow over cylindrical geometry......Page 130
Slumping process for unsupported control rod segment......Page 132
Melting and Relocation......Page 133
6.1 COUPLE Description......Page 135
Thermal Conductivity Model......Page 136
Dryout of Debris......Page 138
Natural Convection of Liquefied Debris......Page 139
Schematic defining the location of a typical phase change element......Page 142
SIMPLIFIED CORE REGION LUMPED PARAMETER DEBRIS MODELING......Page 144
rods or rubble debris to molten pool......Page 149
Formation and Heatup of Porous Debris......Page 152
7.3 Molten Pool......Page 159
Physical process being represented by spreading model......Page 160
Framework for model calculating stability of crust......Page 162
Rate of Spreading of Molten Pool......Page 163
Heat transfer from pool of molten debris......Page 169
Core Slumping Models......Page 170
MODEL FOR CREEP RuErlTuRE OF STRUCTURAL COMPONENTS......Page 172
9 REFERENCES......Page 174
Definition of mesh for two-dimensional heat conduction......Page 21
Various configurations of oxidizing debris......Page 33
Parabolic rate constant for mixture of 85 mol% Zr and 15 mol% U02......Page 34
(based on total decay heat from all released fission products)......Page 51
for a standard PWR fuel rod design......Page 62
for a standard BWR fuel rod design......Page 63
Processes occurring during meltdown of fuel rod......Page 72
Posttest view of bundleCORA-13......Page 74
Characteristics of fuel rod meltdown......Page 75
Framework of LIQSOL calculations......Page 76
Frame of reference for LIQSOL equations in Table4-15......Page 86
Blockage of drops of relocating material by spacer grid......Page 89
Growth of reaction zone in fuel rod cladding......Page 98
Variable area of contact between grid spacer and fuel rod cladding......Page 104
Definitions of equivalent thickness of reaction zone......Page 105
temperature following creation of newly slumped material......Page 108
Configuration of disintegrated fuel rod......Page 111
Chemical reaction between control rod cladding and guide tube......Page 116
A typical BWR control blade and fuel assembly......Page 118
calculation......Page 128
Nusselt number ratio as a function of the angle from core centerline......Page 141
Modeling of heat transfer across structure-debris interface......Page 143
rods to rubble debris......Page 146
rods to cohesive debris......Page 147
rods or rubble debris to molten pool......Page 148
Heat conduction process modeled for cohesive debris......Page 150
Example of calculated layout of rodlike and cohesive debris regions......Page 155
Configuration of partially quenched debris bed......Page 157
molten matenal into porous debris......Page 166
Definition of variables in Equation4-10......Page 39
NUREG/CR-4173......Page 42
elements (based on total decay heat from all released fission products)......Page 50
PWR fuel rod data input for FRAPCON-2 calculations......Page 60
BWR fuel rod data input for FRAPCON-2 calculations......Page 61
relative void volumes......Page 64
between FRAPCON-2 and FPRESS calculations......Page 65
between FRAPCON-2 and FPRESS calculations......Page 67
Summary of processes modeled by LIQSOL......Page 73
Equation set for calculation of temperature of drop of relocating material......Page 88
Value of coefficients in equation for growth of reaction zone......Page 97
Equations for calculating the time to creep rupture......Page 173