RD&D-Programme 2004 - SKB

15 Fuel 163
15.1 Initial state in fuel/cavity 163
15.1.1 Variables 163
15.1.2 Geometry 164
15.1.3 Radiation intensity 164
15.1.4 Temperature 164
15.1.5 Hydrovariables 165
15.1.6 Mechanical stresses 165
15.1.7 Total radionuclide inventory 165
15.1.8 Gap inventory 167
15.1.9 Material composition 167
15.1.10 Water composition 167
15.1.11 Gas composition 168
15.2 Processes in fuel/cavity 168
15.2.1 Overview of processes 168
15.2.2 Radioactive decay 169
15.2.3 Radiation attenuation/heat generation 169
15.2.4 Induced fission (criticality) 169
15.2.5 Heat transport 170
15.2.6 Water and gas transport in canister cavity, boiling/condensation 170
15.2.7 Thermal expansion/cladding failure 170
15.2.8 Advection and diffusion 170
15.2.9 Residual gas radiolysis/acid formation 170
15.2.10 Water radiolysis 170
15.2.11 Metal corrosion 171
15.2.12 Fuel dissolution 171
15.2.13 Dissolution of gap inventory 180
15.2.14 Speciation of radionuclides, colloid formation 180
15.2.15 Helium production 182
16 Canister as barrier 183
16.1 Initial state of canister 183
16.1.1 Variables 183
16.1.2 Geometry 183
16.1.3 Radiation intensity 184
16.1.4 Temperature 184
16.1.5 Mechanical stresses 184
16.1.6 Material composition 185
16.2 Canister processes 185
16.2.1 Overview of processes 185
16.2.2 Radiation attenuation/heat generation 185
16.2.3 Heat transport 186
16.2.4 Deformation of cast iron insert 186
16.2.5 Deformation of copper canister under external pressure 186
16.2.6 Thermal expansion 187
16.2.7 Deformation from internal corrosion products 187
16.2.8 Corrosion of cast iron insert 188
16.2.9 Galvanic corrosion 188
16.2.10 Stress corrosion cracking of cast iron insert 189
16.2.11 Radiation effects 189
16.2.12 Corrosion of copper canister 189
16.2.13 Stress corrosion cracking of copper canister 190
16.2.14 Grain growth in copper 191
16.2.15 Radionuclide transport 191
16.2.16 Integrated studies – evolution of damaged canister 191
12 RD&D-Programme 2004