Feasibilyty study for mid-depth disposal of wastes solidified by asphalt, plastic and ROBE

Miki, Takahito*

In this report, feasibility studies for mid-depth disposal of wastes solidified by asphalt, plastic and ROBE which are generated from JNC's Tokai reprocessing plant were carried out. In this study, at first, the characteristics of those wastes were summarized. And FEPs (Features, Events and Processes) regarding safety assessment for mid-depth disposal system were reviewed. Next, stochastic simulations were conducted to clarify the enough conditions in system specification for achieving a target which is well below the dose criteria for groundwater scenarios. Furthermore, important issues which affect disposal barrier systems were extracted using results of stochastic analysis and FEPs considerations. With regard to the environmental impacts of nitrate and boron which are included in the above wastes, literature survey and preliminary numerical analysis regarding flux and concentrations of them around disposal facility were carried out in order to discuss the feasibility. Finally, research programs for the improvement feasibility of mid-depth disposal of those wastes were developed.