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The present study shows that Si as an impurity in UO(2) fuel can react with the fission product Ba to form different barium silicates with melting points of about 1400 C. Crystalline or glassy phases can form preferentially at grain boundaries or surfaces (e.g. cracks in fuels). Such phases will also contain other fission products including fission rare gases since these are continuously introduced by fission recoil. Release temperatures from these silicates are low. Nearly total release from the silicates can therefore be expected in fuel experiencing temperatures in excess of 1000 C, as is for instance the case in transient tested fuel.

Additional information

Authors: MATZKE H-J, JRC Karlsruhe (DE);LUCUTA P G, AECL Research, Fuel Materials Branch, Chalk River, Ontario (CA);VERRALL R A, AECL Research, Fuel Materials Branch, Chalk River, Ontario (CA)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 185 (1991) pp. 292-296
Record Number: 199210139 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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