Preliminary estimation of the limitation of the amount of nitrate in concrete pit facilities

Hara, Hironori; Amazawa, Hiroya; Sakai, Akihiro ; Nakata, Hisakazu ; Sakamoto, Yoshiaki 

Low level radioactive waste which is included high concentrated nitrate are planned to be disposed into concrete pit facility. From the point of view of environmental effect by easily soluble nitrate ion into groundwater, the safety assessment will be needed for the concrete pit type disposal facilities. In this study, the nitrate ion concentration in groundwater, lake and stream nearby the concrete pit type disposal facilities was simulated by advective-diffusion analysis. From the results of analysis, the limitation of amount of nitrate in the waste package was estimated from the environmental standard determined by Basic Environment Law.