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Time-Dependence of Volatilization of 137Cs and 106Ru Over High-Level Waste Glass in a Canister

Published online by Cambridge University Press:  25 February 2011

Hiroshi Kamizono  and
Susumu Muraoka
Hiroshi Kamizono
Affiliation:
Dept. of Environmental Safety Research, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken, 319-11, Japan
Susumu Muraoka
Affiliation:
Dept. of Environmental Safety Research, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken, 319-11, Japan
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Abstract

Volatility of 137Cs and 106Ru at 600ºC over high-level waste glass in a canister is numerically analyzed. The time-dependence of normalized concentrations of each radionuclide is traced by a differential equation based on a simple model consisting of competitive forward and backward steps. It is assumed that, as time proceeds, a surface layer forms on the glass and serves as a protective barrier against volatilization. It is found that the forward rate of volatilization for 137Cs is about 140 times greater than that of 106Ru at 600ºC. The effects of the glass surface area and plenum volume on the concentration excursion inside the canister are closely estimated by the differential equation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 257: Symposium – Scientific Basis for Nuclear Waste Management XV , 1991 , 191
Copyright
Copyright © Materials Research Society 1992

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References

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