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Numerical modeling of radionuclide migration through a borehole disposal site
Serwaa Yeboah1, Thomas T Akiti2, John J Fletcher2
1Graduate School of Nuclear and Allied Sciences, Atomic Energy, University of Ghana, P.O. Box AE 1, Legon, Ghana ; National Radioactive Waste Management Centre, National Nuclear Research Institute, Ghana Atomic Energy Commission, Box LG 80, Legon, Ghana.
Abstract:
The migration of radionuclides from a borehole repository located about 20 km from the Akwapim fault line which lies in an area of high seismicity was analyzed for some selected radionuclides. In the event of a seismic activity, fractures and faults could be rejuvenated or initiated resulting in container failure leading to the release of radionuclides. A numerical model was solved using a two-dimensional finite element code (Comsol Multiphysics) by taking into account the effect of heterogeneities. Results showed that, the fractured medium created preferential pathways indicating that, fault zones generated potential paths for released radionuclides from a radioactive waste repository. The results obtained showed that variations in hydraulic conductivity as a result of the heterogeneity considered within the domain significantly affected the direction of flow.
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