Study on the nuclide behavior in the engineered barrier for TRU wasete, IV

Yanagisawa, Ichiro*; Naito, Taisei*; Kitao, Hideo*; Mukai, Satoru*; Doi, Hideo*

JNC TJ8400 99-020, 25 Pages, 1999/02

JNC-TJ8400-99-020.pdf:0.64MB

In this study, apparent diffusion coefficients and distribution coefficient of some nuclides were measured for bentonite materials as engineered barrier. The summary of this study is as follows: (1)Apparent diffusion coefficients of nuclides in compacted bentonite were measured. The data so far were summarized as database of apparent diffusion coefficients and distribution coefficients. (2)In diffusion tests for mixture of Ca-type altered bentonite and analcime, apparent diffusion coefficient of Sr was a little smaller than that for Ca-type altered bentonite. (3)In diffusion tests for Ca-type altered bentonite, apparent diffusion coefficients and distribution coefficients of nuclides showed no significant difference between bentonite-water system and bentonite-cementitious solution systems. (4)In Na-type bentonite-solution with nitrate system, apparent diffusion coefficients of Cs and Sr were smaller than that for other bentonite-solution systems. (5)Apparent diffusion coefficients of tritium showed no significant difference between Ca-type altered bentonite and Na-type bentonite in any solution systems.