Studies on nuclide transport simulation in a certain potential nuclear waste disposal site

Nuclear transport in fractured media is very important for geological disposal of nuclear waste. In order to know the law of nuclide transport in fracture system, the basic differential equations of nuclide transport in fracture and matrix are obtained based on the dual media theory, and the general analytic solutions of nuclide transport in single fractured media with exponential attenuation source in fracture are deduced by Laplace transform; According to analysis of hydrogeological condition in a certain potential nuclear waste disposal site in northeast China, some parameters are obtained, and the transport of Cs-134, Co-57, and Tc-99 are simulated with one-dimensional multi-pathway model, the relative concentration of these nuclides in fracture system are predicted. The results show that the transport velocity of Cs-134 is the fastest, while Tc-99 is the slowest if the simulation condition is same. (authors)