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Thermal diffusivity and specific heat of SIMFUEL - simulated high burnup UO(2) fuel with an equivalent burnup of 3 and 8 at% - were measured between 300 and 1800 K, and the data combined to obtain thermal conductivity. This provided a model for the intrinsic conductivity of high burnup fuels, i.e. the conductivity of the fuel without gas bubbles. The results for 3 and 8 at% burnup SIMFUEL were lower than those measured for UO(2) by 19% and 45% at 300 K and by 6% and 15% at 1773 K. The reduction in thermal conductivity was approximately linear with burnup. This reduction is a possible explanation for the enhanced gas-release observed from high burnup fuel.

Additional information

Authors: LUCUTA P G, AECL Research, Chalk River Laboratories, Ontario (CA);VERRALL R A, AECL Research, Chalk River Laboratories, Ontario (CA);MATZKE H-J, JRC Karlsruhe (DE);TASMAN H A, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: E-MRS Symposium on Chemical and Physical Modifications Induced by Irradiation in Glasses, Strasbourg (FR), Nov. 4-8, 1991
Availability: Available from (1) as Paper EN 36569 ORA
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