Thermal Conductivity of a Simulated Fuel with Dissolved Fission Products |
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Authors: | K H Kang H S Moon K C Song M S Yang S H Lee S W Kim |
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Affiliation: | (1) Division of Dry Process Fuel Technology Development, Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon, 305-600, Korea;(2) Division of Physical Metrology, Korea Research Institute of Standards and Science, P.O. Box 102, Yuseong, Daejeon, 305-600, Korea;(3) Department of Physics, University of Ulsan, Ulsan, 680-749, Korea |
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Abstract: | The thermal diffusivity of a simulated fuel with fission products forming a solid solution was measured using the laser-flash
method in the temperature range from room temperature to 1673 K. The density and the grain size of the simulated fuel with
the solid solutions used in the measurement were 10.49 g · cm−3 (96.9% of theoretical density) at room temperature and 9.5 μm, respectively. The diameter and thickness of the specimens were 10 and 1 mm, respectively. The thermal diffusivity decreased
from 2.108 m2 · s−1 at room temperature to 0.626 m2 · s−1 at 1673 K. The thermal conductivity was calculated by combining the thermal diffusivity with the specific heat and density.
The thermal conductivity of the simulated fuel with the dissolved fission products decreased from 4.973 W · m−1 · K−1 at 300 K to 2.02 W · m−1 · K−1 at 1673 K. The thermal conductivity of the simulated fuel was lower than that of UO2 by 34.36% at 300 K and by 15.05% at 1673 K. The difference in the thermal conductivity between the simulated fuel and UO2 was large at room temperature, and decreased with an increase in temperature.
Paper presented at the Seventeenth European Conference on Thermophysical Properties, September 5–8, 2005, Bratislava, Slovak
Republic. |
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Keywords: | laser-flash method simulated fuel solid solution thermal conductivity thermal diffusivity |
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