PRELIMINARY ANALYSIS OF DIPOLE TRACER MIGRATION EXPERIMENTS IN FRACTURED SEDIMENTARY ROCK AT HORONOBE URL OF JAPAN

摘要

For understanding mass transport mechanism in the rock utilized as a natural barrier for radioactive waste disposal sites, in-situ dipole tracer migration experiments were conducted in a fracture of Wakkanai Formation mudstone at the G.L.-250m gallery of the Horonobe URL, northern Hokkaido, Japan. Preliminary analysis of the analytical solution retrieved from one-dimensional advection-dispersion equation indicates that fracture surfaces in mudstone have both reversible and irreversible sorption characteristics for Cs~+ and Sr~(2+) but intensive irreversible sorption for Co~(2+) and Eu~(3+).