Evaluation of a Temporary Repository of Radioactive Waste
The confinement of radioactive waste (radionuclides) in underground installations has to take into account its influence on the environment, the solvent action and the waste groundwater drag. This work evaluates by computer simulations how radionuclides m
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stract The confinement of radioactive waste (radionuclides) in underground installations has to take into account its influence on the environment, the solvent action and the waste groundwater drag. This work evaluates by computer simulations how radionuclides migrate through the subsurface of a typical site in Mexico. The simulations show preferential routes that the contaminant plume follows over time. Results indicate that the radionuclides flow is highly irregular and it is influenced by failures in the area and its interactions in the fluid–solid matrix. The obtained concentration of the radionuclide is as expected.
R. González-Galán (&) Facultad de Ciencias, Universidad Autónoma del Estado de México, El Cerrillo, Piedras Blancas C.P, 50200 Estado de Mexico, Mexico e-mail: [email protected] E. de la Cruz-Sánchez J. Klapp-Escribano E. Mayoral-Villa S. G. Uribarri Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca s/n, La Marquesa, Ocoyoacac C.P, 52750 Estado de México, Mexico e-mail: [email protected] N. Pérez-Quezadas Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico D.F., 04510 Mexico J. Klapp-Escribano Departamento de Matemáticas, CINVESTAV-IPN, Mexico D.F., 07360, Mexico
J. Klapp et al. (eds.), Fluid Dynamics in Physics, Engineering and Environmental Applications, Environmental Science and Engineering, DOI: 10.1007/978-3-642-27723-8_40, Springer-Verlag Berlin Heidelberg 2013
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1 Introduction Computer simulation tools are useful in evaluating and selecting confinement radionuclide sites. These tools are: (1) a mathematical model that describes the main phenomena that affects the process, and (2) a computational model that solves the equations of the mathematical model. In recent decades there has been a growing need to perform this type of study to define appropriate strategies for radionuclide disposal. For oil industry applications, Coats and Smith (1964) have proposed a mechanism for the fluid flow through a virtually immobile solid matrix, Corapcioglu and Baehr (1987) studied the pollution of a porous media by petroleum products. The works of Neretnieks (1980), Pollock (1986) and Walton (1994) focused its attention on the subsurface transport of radionuclides and the hydrodynamic behavior of the barriers on confinement sites. In the present will deal with radionuclides transport calculations. For this purpose we first solve the equations that describe the water flow that is seeping through the ground. A classical approach for the solution of this problem (Bear 1979), consists of considering the porous medium as a continuum and the pointto-point spatial variations of hydrogeological characteristics as an average over a representative element of the volume (REV). The applicability of this approach has been studied by Long et al. (1982) and Schwartz (1988). Water hydrodynamic is calculated from a conservation equation based on Darcy’s law. On the other hand, transport equation considers that the variation o
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