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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

1. Johnson, L.H., Stroes-Gascoyne, S., Shoesmith, D.W., Bailey, M.G. and Sellinger, D.N., in KBS TR 83-76, edited by Werme, L (Swedish Nuclear Fuel and Waste Management Co, Stockholm 1984).Google Scholar
2. Gromov, V., Rad. Phys. Chem. 18, 133(1981).Google Scholar
3. Rasmussen, O.L., Bjergbakke, E., CHEMSIMUL - a program package for numerical simulation of chemical reaction systems. Riso report no R-395 1984.Google Scholar
4. Christensen, H., Bjergbakke, E., in Scientific Basis for Nuclear Waste Management IX, edited by Werme, L.. (Materials Research Society, Pittsburg 1986) pp 401–408.Google Scholar
5. Christensen, H. and Bjergbakke, E., Nucl. Chem. Waste Manag., accepted for publication.Google Scholar
6. Pikaev, A.K., Shilov, V.P. and Spitsyn, V.I., Radiolysis of aqueous soluticns of lanthanides and actinides, Nauka, Moscow, 1983 (In Russian).Google Scholar
7. Bielski, B.H., Cabelli, D.E., Arudi, R.L. and Ross, A.B., Phys. Chem. Reference Data, 14, 1041 (1985).Google Scholar
8. Greenstock, C.L., Ross, A.B. and Helman, P., Radiat Phys. Chem, 17, 247 (1981).Google Scholar
9. Shoesmith, D.W., Sunder, S., Johnson, L.H. and Bailey, M.G., in Scientific Basis for Nuclear Waste Management IX, edited by Werme, L.. (Materials Research Society, Pittsburg 1986) pp 309–316.Google Scholar