Author/Authors :
K. H. Kang، نويسنده , , K. C. Song and M. S. Yang ، نويسنده , , S. H. Lee and S. W. Kim ، نويسنده ,
Abstract :
The thermal diffusivity of simulated fuels with dissolved fission products
was measured by using the laser-flash method in the temperature range from room
temperature to 1,473 K. Three kinds of simulated fuels with an equivalent burn-up of
3, 6, and 12 at%were used in the measurement. The thermal diffusivity and the thermal
conductivity of the simulated fuels with the dissolved fission products decreased, as
the temperature and the equivalent burn-up increased. The thermal conductivities of
simulated fuels with equivalent burn-ups of 3, 6, and 12 at% were lower than that
of UO2 by 84.70, 67.17, and 44.97% at 300K and 99.17, 89.88, and 80.56% of
UO2 at 1,473 K, respectively. The difference in the thermal conductivity between
the simulated fuel and UO2 was large at room temperature, and it decreased as the
temperature increased. The thermal resistivity of the simulated fuels increased linearly
with temperature up to 1,473 K.
