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http://dx.doi.org/10.7733/jnfcwt.2020.18.2(E).305

Method for Evaluating Radionuclide Transport in Biosphere by Calculating Elapsed Transport Time  

Ko, Nak-Youl (Korea Atomic Energy Research Institute)
Ji, Sung-Hoon (Korea Atomic Energy Research Institute)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.18, no.2_spc, 2020 , pp. 305-315 More about this Journal
Abstract
For geological disposal of radioactive wastes, a method was proposed to evaluate the radionuclide transport in the biosphere by calculating the elapsed time of nuclide migration. The radionuclides were supposed to be introduced from a natural barrier and reached a large surface water body following a groundwater flow in a shallow subsurface. The biosphere was defined as a shallow subsurface environment that included aquifers on a host rock. Using the proposed method, a calculation algorithm was established, and a computer code that implemented the algorithm was developed. The developed code was verified by comparing the simulation results of the simple cases with the results of the analytical solution and a public program, which has been widely used to evaluate the radiation dose using the radionuclide transport near the surface. A case study was constructed using the previous research for radionuclide transport from the hypothetical geological disposal repository. In the case study, the code calculated the mass discharge rate of radionuclide to a stream in the biosphere. Because the previous research only demonstrated the transport of radionuclides from the hypothetical repository to the host rock, the developed code in the present study could help identify the total transport of radionuclide along the complete pathway.
Keywords
Radionuclide transport simulation; Transport in porous media; Radionuclide transport in biosphere; Time-domain random walk (TDRW) method;
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Times Cited By KSCI : 2  (Citation Analysis)
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