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Report No.

An Evaluation of solubility limits on maximum uranium concentrations in groundwater

Iwatsuki, Teruki  ; Arthur, R. C,*

Maximum uranium concentrations in groundwaters associated with a uranium ore deposit in Japan appear to be controlled by the solubility of the amorphous hydrous oxide, UO$$_{2}$$(am). This conclusion is supported by calculated saturation indices for this mineral using geochemical data characterizing the deposit and its surroundings. The conclusion that UO$$_{2}$$(am) appears to be solubility controlling in a natural system that has evolved over long periods of time supports the assumption adopted in many international studies that the solubility of this phase would limit the aqueous concentrations of U released from a deep geologic repository for nuclear wastes over similar time scales. Natural systems can thus provide a useful framework for testing assumptions and models used in repository safety assessments.



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