Investigation on proper materials of a liner system for trench type disposal facilities of radioactive wastes from research, industrial and medical facilities

Nakata, Hisakazu ; Amazawa, Hiroya; Sakai, Akihiro ; Arikawa, Masanobu; Sakamoto, Yoshiaki 

JAEA will settle on near surface disposal facilities with and without engineered barriers for radioactive wastes. Both of them are so called concrete pit type and trench type, respectively. Technical standards of constructing a disposal facility based on Law for the Regulations of Nuclear Source Material, Nuclear Fuel Material and Reactors have been regulated partly by referring to that of Waste Management and Public Cleansing Law. This means that the concrete pit type and the trench type facility resemble an isolated type and a non leachate controlled type final disposal site, respectively. On the other, we plan to design a disposal facility with a liner system corresponding to a leachate controlled type final disposal site. By current nuclear related regulations, There are no technical standards of constructing the disposal facility with the liner system. So we investigate the function of the liner system in order to design a proper liner system for the trench type disposal facility.