Radiation damage-enhanced dissolution of UO(2) in water
The knowledge and understanding of the leaching mechanisms of spent nuclear fuels is of obvious importance for the concept of direct storage of LWR UO(2) fuel in deep geological repositories. For improved economy the burnup of UO(2) fuel has been increased in recent years. Yet this has been shown to result in structural changes on the cold outer part of the fuel that has important implications for the leaching of fissile material. This study examines the questions of whether leaching rates and solubilities of UO(2) in water are affected because of increased fission product formation before changes to the outer structure (grain subdivision) occur. Results presented show that while UO(2) is structurally stable, exposure to water at temperatures between 20 and 90 C increases leaching by more than an order of magnitude in UO(2) implanted with energetic fission products (Rb, Ki) to concentrations in the range of 3 to 5 % and damage levels of approximately 20 dpa.
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 190 (1992) pp. 101-106
Record Number: 199211550 / Last updated on: 1994-11-29
Original language: en
Available languages: en