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UO(2) fuels irradiated at burn-up between 30 and 58 GWd/t and at average linear power ranging from 35 to 20 kW/m have been investigated. The aim was to determine the influence of increasing burn-up on fission gas release and the relationship between gas release and the fuel microstructure. In these experiments the release of 85Kr was measured during the annealing of irradiated UO(2) samples under H(2)O:H(2) = 1:10, He/2%H(2), and CO(2):CO = 10:1 atmospheres. The fuel restructuring as a consequence of the annealing was analysed by optical microscopy and SEM. This study gives qualitative kinetic information on the influence of the different parameters chosen. The results support the view that an increase of the fission gas diffusion rate is caused by increasing burn-up, by annealing under oxidic atmospheres and by decreasing fuel grain size.

Additional information

Authors: COQUERELLE M, JRC Karlsruhe (DE);BOTTOMLEY D, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: IAEA Technical Committee Meeting on Fission Gas Release and Fuel Rod Chemistry Related to Extended Burn-up, Pembroke (CA), April 28 - May 1, 1992
Availability: Available from (1) as Paper EN 36673 ORA
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