Modeling of the pseudo-colloids migration for multi-member decay chains with a arbitrary flux boundary condition in a fractured porous medium |
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Authors: | Mi-Seon Jeong Yongsoo Hwang and Chul-Hyung Kang |
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Institution: | (1) University of Science and Technology, 761 Gajungro, Yuseong-Gu, Daejeon, 305-350, Korea;(2) Korea Atomic Energy Research Institute, 1045 Daedeokdaero, Yuseong-Gu, Daejeon, 305-353, Korea |
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Abstract: | A deep geologic disposal is the prime option for the long-term isolation of high-level radioactive waste (HLW) in many countries.
For deeply located repositories, a radionuclide released from a failed waste container moves through the engineered and natural
barriers before it reaches a biosphere. The pseudo-colloid which a radionuclide is adsorbed on a moving natural humic or fulvic
colloid can be generated in a fractured porous medium. The size of a colloid is in general in the order of a hundred nanometer
so that its migration velocity in a fracture is higher than that of a radionuclide due to the hydrochromatic effect. A large
colloid cannot diffuse easily into a surrounding rock. Also, there are many kinds of actinides and these actinides have decay
chains. In this analysis, the canonical form solution is derived for a pseudo-colloid and a solute in a fracture and a surrounding
rock with a realistic inlet boundary condition with multi-member decay chains. It is used the Fortran based a computational
code which uses a special subroutine for the inversion of Laplace transform. Consequently, the role of the pseudo-colloid
in the fractured porous medium is important and also their decay chains aren’t neglected in the performance assessment of
the HLW. |
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