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Effects of Water Redox Conditions and Presence of Magnetite on Leaching of Pu and Np From HLW Glass

Published online by Cambridge University Press:  10 February 2011

Y. Inagaki ,
H. Sakata ,
H. Furuya ,
K. Idemitsu ,
T. Arima ,
T. Banba ,
T. Maeda ,
S. Matsumoto ,
Y. Tamura  and
S. Kikkawa
Y. Inagaki
Affiliation:
Dept. of Nucl. Eng., Kyushu University, Fukuoka 812-81, JAPAN
H. Sakata
Affiliation:
Dept. of Nucl. Eng., Kyushu University, Fukuoka 812-81, JAPAN
H. Furuya
Affiliation:
Dept. of Nucl. Eng., Kyushu University, Fukuoka 812-81, JAPAN
K. Idemitsu
Affiliation:
Dept. of Nucl. Eng., Kyushu University, Fukuoka 812-81, JAPAN
T. Arima
Affiliation:
Dept. of Nucl. Eng., Kyushu University, Fukuoka 812-81, JAPAN
T. Banba
Affiliation:
Japan Atomic Energy Research Institute, Tokai Research Establishment, Ibaraki 319-11, JAPAN
T. Maeda
Affiliation:
Japan Atomic Energy Research Institute, Tokai Research Establishment, Ibaraki 319-11, JAPAN
S. Matsumoto
Affiliation:
Japan Atomic Energy Research Institute, Tokai Research Establishment, Ibaraki 319-11, JAPAN
Y. Tamura
Affiliation:
Japan Atomic Energy Research Institute, Tokai Research Establishment, Ibaraki 319-11, JAPAN
S. Kikkawa
Affiliation:
Japan Atomic Energy Research Institute, Tokai Research Establishment, Ibaraki 319-11, JAPAN
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Abstract

The objective of this study is to evaluate the effects of water redox conditions and of the presence of iron corrosion products (magnetite) on the release of actinides from HLW glasses. Static corrosion tests were performed on a simulated HLW glass doped with Pu and Np in deionized water in the presence of magnetite under oxidizing and reducing conditions. The tests under oxidizing conditions were performed in air, while the tests under reducing conditions were performed in mixed gas (Ar+5%H2) atmosphere.

The following results were obtained: (1) The presence of magnetite enhances formation of colloids containing Pu and Np in the leachates under both redox conditions. (2) Redox conditions have no remarkable influence on the release of Pu. (3) The reducing conditions combined with the presence of magnetite cause a decrease in the concentrations of Np dissolved species, which is probably the result of the reduction of Np(V) to Np(IV) at the magnetite surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 177
Copyright
Copyright © Materials Research Society 1998

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References

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