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The specific heat of SIMFUEL (simulated high burnup UO(2)-based fuel) with equivalent burnups of 3 and 8 atmospheric % was measured between room temperature and 1400 C. The results from samples annealed at three different oxygen potentials showed only small changes with the burnup and the oxygen potential: the specific heat increased slightly with burnup and oxygen potential.

Changes in the slope in plots of C(p) as a function of the temperature in hyperstoichiometric UO(2) and hyperstoichiometric SIMFUEL could be related to the dissolution of the U(4)O(9) phase observed by X-ray diffraction at room temperature. These results are discussed in the context of existing theoretical models. Their relevance to predict the thermal behaviour of UO(2) fuel as a function of burnup is also discussed. .

Additional information

Authors: MATZKE H, JRC Karlsruhe (DE);LUCUTA P G, AECL, Chalk River Laboratories, Ontario (CA);VERRALL R A, AECL, Chalk River Laboratories, Ontario (CA);HENDERSON J, Netzsch Gerätebau GmbH, Selb (DE)
Bibliographic Reference: Paper presented: 9th International Symposium on Thermodynamics of Nuclear Materials, Osaka (JP), August 25-30, 1996
Availability: Available from (1) as Paper EN 39896 ORA
Record Number: 199611459 / Last updated on: 1997-01-16
Original language: en
Available languages: en
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