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Radiation Induced Dissolution of UO2

Published online by Cambridge University Press:  28 February 2011

Hilbert Christensen  and
Erling Bjergbakke
Hilbert Christensen
Affiliation:
Studsvik Energiteknik AB, S-611 82 Nykdping, Sweden
Erling Bjergbakke
Affiliation:
Risø Forsøgsstation, Postboks 49, DK-4000 Roskilde, Danmark
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Abstract

A model for the radiation induced dissolution of U02has been developed and tested using experiments described in the literature. The model makes use of computer calculations based on a reaction mechanism in which the dissolution is initiated by reactions of H202, OH and H02 radicals with the U02surface. The model gave a fair agreement between calculated and experimental results: For a dose rate of 400 rad/s the calculated yields of oxidation were 2.6 and 2.1 % - h−1· m−2after 1 and 2 h, respectively. The corresponding experimental yields were 1.9 and 1.5 % ·h−1· m−2, when corrected for dissolution without irradiation. The effect of various initial concentrations of H202has been tested, and a reasonable rate constant for the reaction of U02and H202has been found. The requirement for the rate constant is that H202begins to be effective above concentrations of 10−3 mol · dm−3in accordance with experiments by L. Johnson.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 84: Symposium L – Scientific Basis for Nuclear Waste Management X , 1986 , 115
Copyright
Copyright © Materials Research Society 1987

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References

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