Migration of radionuclides, leaching from a repository for spent nuclear fuel, is supposed to be retarded by several mechanisms, for example matrix diffusion, sorption, and co-precipitation. Some of those mechanisms may be described in terms of solid solutions. Thus, sorption of a radionuclide upon a precipitating surface, causes a solid solution to be formed, although the initial mechanism is of another nature. To handle the interactions between an aqueous phase and a solid solution, a program, SOLISOL, was written. The program searches the equilibrium concentrations of the components in the two phases. To perform this, SOLISOL calls the well-known PHREEQE program, checks results, and uses it to search equilibrium within the constraints given by limited quantities of the solid solution components. To test the program, leaching of cement with synthetic groundwater has been simulated. In the simulations, only the main components of the cement have been taken into consideration. The results have been compared with experimental results from the literature. The simulated results agree reasonably well with the observations. © 1993.
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