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The oxygen potential of fast breeder mixed oxide fuel (U(0.8)Pu(0.2))O(1.98) irradiated to different burn-ups up to 11 at% has been determined between 900 and 1300 K by measurements of the electromotive force in a galvanic microcell. The oxygen potential increases continuously with burn-up, due to the oxidative nature of fission and due to fission products dissolved in the fuel matrix. Lattice parameter measurements of similar fuel indicate that the fuel with the initial O/M ratio of 1.98 is still substoichiometric even at 7% burn-up. If the lattice parameter measurements are accepted, the increase in oxygen potential due to fission products is larger than previously assumed.

Additional information

Authors: MATZKE H J, JRC Karlsruhe Estab. (DE);PELLOTTIERO D, JRC Karlsruhe Estab. (DE);OTTAVIANI J, CEA, CEN de Cadarache, Saint-Paul-lez- Durance (FR);ROUAULT J, CEA, CEN de Cadarache, Saint-Paul-lez- Durance (FR)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 160 (1988), pp. 142-146
Record Number: 198910197 / Last updated on: 1994-12-01
Original language: en
Available languages: en