[2E01-07] Evaluation of physical properties of nuclear fuel

[2E04] The heat capacity and thermal diffusivity of UO₂ at high temperature

*Taku Matsumoto¹, Shun Hirooka¹, Masatoshi Akashi¹, Masato Kato¹, Masahiro Ogasawara² (1. JAEA, 2. Inspection Development Co.)

Keywords:Uranium dioxide, Heat capacity, Thermal diffusivity, Themal conductivity

The enthalpy and thermal diffusivity up to 2000℃ was measured with drop calorimetry and laser flash instrument, respectively. The heat capacity evaluated from the measurement results of enthalpy sharply increases from 1500℃ that shows different results from the data obtained by some researchers. The thermal diffusivity decreases with increasing of temperature to 1500℃, and has almost stable value above 1500℃.