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The effect of excess oxygen on fuel thermal conductivity was investigated using hyperstoichiometric SIMFUEL and UO(2+x) by annealing the specimens in an oxidising atmosphere (CO(2)/CO mixture). Under these conditions the thermal diffusivity and specific heat of the specimens were measured and combined to obtain the thermal conductivity values. The thermal conductivity of UO(2+x) decreases with increasing O/U ratio. The thermal conductivity values obtained for hyperstoichiometric SIMFUEL also decrease with temperature for each simulated burnup and oxygen potential. It is concluded that the thermal conductivities of hyperstoichiometric SIMFUEL were lower than those measured on specimens annealed in reducing conditions. Excess oxygen is the dominant factor contributing to thermal conductivity degradation at high oxygen potentials.

Additional information

Authors: LUCUTA P G, AECL Research, Ontario (CA);VERRALL R A, AECL Research, Ontario (CA);MATZKE H, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: 13th IUPAC Conference on Chemical Thermodynamics, Clermont-Ferrand (FR), July 17-22, 1994
Availability: Available from (1) as Paper EN 38421 ORA
Record Number: 199510035 / Last updated on: 1995-01-10
Original language: en
Available languages: en