Application of TOUGH2/EOS7R to modeling of radionuclide release from a low/intermediate level repository under two-phase conditions
Description: The generation of gas due to corrosion of repository waste packages under water-saturated conditions will give rise to pressure increases and two-phase flow conditions. We have developed a numerical simulator TOUGH2/EOS7R for modeling the two-phase flow and transport of a parent-daughter pair of radionuclides including the processes of adsorption, first-order decay, binary diffusion, and volatilization. TOUGH2/EOS7R is a descendant of EOS7, the water, brine and air module of TOUGH2. We apply TOUGH2/EOS7R to an example problem relevant to the disposal of low- and intermediate-level nuclear wastes in crystalline rock. The conceptual model and spatial discretization were provided to us by NAGRA. We demonstrate in preliminary simulations that to good approximation, the generation of hydrogen can be modeled using air as a proxy for hydrogen. Simulations of gas generation and subsequent flow and transport away from the repository demonstrate the use and flexibility of TOUGH2/EOS7R. By small modification in the code, users can printout data for calculating the fractional release curve (FR curve), which shows the instantaneous release rate from the repository.
Date: June 1, 1996
Creator: Oldenburg, C.M. & Pruess, K.
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