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Thermal conductivity of irradiated UO(2) fuel is dependent on porosity, stoichiometry and burnup, and it is a function of temperature. SIMFUEL (simulated high burnup UO(2) fuel) is a perfect analogue of the irradiated fuel for thermal properties measurements. In this paper, the degradation of SIMFUEL thermal conductivity with burnup is analysed considering the spectral distribution of the phonon heat current for the fluorite matrix and, for the precipitated phases, corrections similar to those used for porosity. The ratio between the phonon frequency and the Debye frequency (Omega(D)) was determined as a function of temperature. The parametric dependence of thermal conductivity derived from SIMFUEL data is provided and applied to the results published for irradiated fuel. The parametric dependence of thermal conductivity on burnup is described by the point defect scattering below 1500 C.

Additional information

Authors: LUCUTA P G, AECL Research, Chalk River Laboratories, Ontario (CA);MATZKE H, JRC Karlsruhe (DE);HASTINGS I J, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: 22nd International Thermal Conductivity Conference ITCC-22, Tempe, Arizona (US), November 7-10, 1993
Availability: Available from (1) as Paper EN 37879 ORA
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