Abstract

Modeling of the H2O–HNO3–UO2(NO3)2–TBP–diluent system has been considered herein. Mole fractions, volume fractions and rational activity coefficients are used in order to create the system of equations on the basis of the mass action law. The method of calculating activity coefficients is provided. Water distribution was taken into account due to the significant importance of free water. Solvate parameters were determined in three subsystems. Application of activity coefficients of nitric acid and uranyl nitrate in mixed solutions was considered during the calculation of the H2O–HNO3–UO2(NO3)2–TBP–diluent system.

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