| SOLUBILITIES OF Am, U, Np AND Pu IN GRANITIC GROUNDWATER |
| Dong-Kwon Keum1†, Han-Soo Lee1, Chang-Woo Lee1, and Volker Metz2 |
1Korea Atomic Energy Research Institute (KAERI), 150 Deokjindong, Yuseong, Daejeon, Korea
2Institute for Nuclear Waste Management, Research Center Karlsruhe P.O.B. 3640, 76021 Karlsruhe, Germany |
Corresponding Author:
Dong-Kwon Keum ,Tel: +82-42-868-2058, Fax: +82-42-861-1761, Email: kdkeum@kaeri.re.kr
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Received: July 14, 2002; Accepted: January 14, 2003. |
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| ABSTRACT |
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The solubilities of Am, U, Np and Pu in granitic groundwater were calculated using geochemical codes with recent thermodynamic data selected from literatures. Calculated solubilities were compared to the experimental data from the leaching test with spent UO2 fuel in the respective solution without and with iron powder under an Ar-CQz atmosphere of 0.03% carbon dioxide gas.
The calculated solubilities of americium and uranium in the solution without iron powder were found to be in agreement with experimental data, but those of neptunium and plutonium did not match the measured data due to the non-equilibrium effects such as colloid formation or radiolytic oxidation. The measured concentrations of actinides in the solution with iron powder were much lower than what were predicted. This was attributed to the adsorption onto the corroded iron surface or co-precipitation.
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| Keywords:
Solubility | actinides | Am | U | Np | Pu | granitic groundwater |
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