In order to establish a thermal analysis technique for spent fuel storage Systems, the porous model, which can simplify the complex configuration of a fuel assembly, has been developed. Thermal conductivity, hydraulic resistance and convective heat transfer were modeled to approximate a fuel assembly as a porous solid, which has equivalent thermo physical properties. Since the model was verified by comparison with experimental results using a single assembly, it was applied to a whole canister analysis including several assemblies. The numerical analysis for a whole canister predicted that the maximum temperature was 621 K at 21.0kW total heat source of fuel assemblies.
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