Thermal properties of dispersion type (U-10Zr)-Zr fuels and alloy type U-Zr fuel

In order to derive the optimum conditions of HYPER blanket fuels, the material properties of dispersion fuels and alloy fuels were investigated. The basic data such as thermal conductivity and thermal expansion were analyzed, because they are essential in the analysis of the core and fuel system. Thermal stability was investigated through heat treatment. Few data are available for the HYPER system fuel. Dispersion type (U-10Zr)-Zr fuels and alloy type U-Zr fuels, surrogate materials for HYPER fuels, were fabricated, and thermal conductivity and thermal expansion were measured. Additionally, thermal stability test was performed to find out the origin of swelling through heat treatment at the operation temperature