Abstract
To assess the performance of underground radwaste repository, proper evaluation of the fate and transport of radionuclides needs to be established from experimental observation and analysis. The goal of this study is to investigate the sorption and diffusion behaviors of Cs and Se in crushed granite through batch test and column diffusion test. In these tests, synthetic groundwater (GW) and synthetic seawater (SW) were employed as liquid phase. From batch tests, it is observed that the Kd values of Cs on crushed granite in anaerobic condition were higher than those in aerobic condition regardless of GW or SW. Based on the results obtained from batch kinetic sorption/desorption tests, a 1-site and a 2-site kinetic models have been determined to be capable of appropriately describing Cs and Se sorption/desorption under test conditions, respectively. In the column diffusion tests, exact analytical solutions have been used in lieu of the method suggested by Crank(1975), to find the apparent diffusion coefficient (Da), due to the ratio of diameter to length is smaller than 5. The values of Da and Rf for Cs and Se in crushed granite columns are not significantly affected by ion concentrations and column lengths.