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The contact resistance effect in the interface between pebble beds was studied with CFD analysis. The lithium ceramics is used as breeder with the form of sphere-shaped pebbles for the extraction of the tritium in some Test Blanket Module (TBM) candidates of ITER. The flow of the gas is essential for the extraction of the tritium. The effects of the gas flow was considered. The effect of fluid flow was not significant on the maximum temperature of the pebble bed. The fluid is the gas phase and the removed heat by the fluid flow is minor. The packing factor was determined by the arrangement of the pebbles in the layers. The packing factor was adjusted by removing the pebbles to make the void in the pebbles bed. Although total generated heat is reduced as the total volume of the pebble becomes smaller, the maximum temperature of the pebbles bed was increased. The thermal conductivity of the pebbles bed was estimated for all results and compared with the some correlations. As the results of comparison, the overall tendency agrees for the effects of the packing factor parameter.
