The two different U-Mo fuel types for research reactors that are currently developed, dispersion and monolithic, show a different behavior in the thermal conductivity in the as-fabricated state and during in-pile irradiation. The thermal conductivity of monolithic U-Mo slightly decreases with increasing burnup mainly due to the formation of fission gas bubbles and crystal lattice decomposition from the fission products. In contrast, the thermal conductivity of dispersion fuel first decreases rapidly, due to effects in the matrix material, and then follows the less rapid trend of the monolithic fuel.
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The two different U-Mo fuel types for research reactors that are currently developed, dispersion and monolithic, show a different behavior in the thermal conductivity in the as-fabricated state and during in-pile irradiation. The thermal conductivity of monolithic U-Mo slightly decreases with increasing burnup mainly due to the formation of fission gas bubbles and crystal lattice decomposition from the fission products. In contrast, the thermal conductivity of dispersion fuel first decreases rap...
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