[en] We have studies some processes related to tritium transport in solid blanket by some experiments. Diffusion processes have been studied by in-situ tritium release experiments under neutron irradiation at elevated temperatures. Diffusion coefficients of tritium in a grain and along grain boundaries of Li₂O and LiAlO₂ were determined separately. Surface reaction was also considered to be quite important for tritium release. Chemical form of released tritium as well as tritium release kinetics depended upon the composition of sweep gas. Basic studies on surface reactions have been also performed on Li₂O and LiAlO₂: (1) Water vapor sorption was investigated by a breakthrough method. Water vapor was considered to be adsorbed dissociatively on the surface of the grains or pores of sintered materials of Li₂O and LiAlO₂. The amount adsorbed on these materials decreased with increasing temperature. (2) Dissociative absorption was considered. Breakthrough method was considered to have a limitation in studying absorption process. (3) Exchange reaction between adsorbed tritiated water and hydrogen in gas phase was studied by a column method. Hydrogen tritide (HT) was found to be produced by an exchange reaction on the surface of the breeding materials. By combining these basic data obtained in these experiment and modeling effort, studies on tritium inventory and migration will be effectively performed. (author)