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abstract

As one of accident tolerant fuel pellets which should have features of good thermal conductivity and high fission product retention, a micro cell UO2Mo pellet has been studied in the aspect of fabrication and thermal property. It was intended to develop the compatible process with conventional UO2 pellet fabrication process. The effects of processing parameters such as the size and density of UO2 granule and the size of Mo powder have been studied to produce sound and dense pellet with completely connected uniform Mo cell-walls. The micro-cell UO2Mo pellet consists of many Mo micro-cells and UO2 in them. The thermal conductivity of the micro-cell UO2Mo pellet was measured and compared to those of the UO2 pellet and the UO2Mo pellet with dispersed form of Mo particles. The thermal conductivity of the micro-cell UO2Mo pellet was much enhanced and was found to be influenced by the Mo volumetric fraction and pellet integrity. A continuous Mo micro-cell works as a heat conducting channel in the pellet, greatly enhancing the thermal conductivity of the micro cell UO2Mo pellet.