Investigation of sub-surface disposal concept; The Cases of Finland and Sweden (Contract research)

Koibuchi, Hiroto; Dohi, Terumi   ; Nakagoshi, Akio*; Amemiya, Kiyoshi*

Sub-surface disposal is one of the disposal methods for low-level radioactive waste in Japan. It will operate below the generally used depth domestically. The waste disposed by this method is assumed to be core internals and part of TRU (the transuranium elements) waste from reprocessing and MOX (mix oxide fuel) fuel fabrication facilities. These contain the waste generated as a result of research activities, too. In order to establish a safety regulation for the disposal, a case study of the overseas disposal is useful. The similar disposal plan of Japan has been considered or already operated especially in Finland and Sweden. Therefore, in this study, we investigated current status and concept of appropriate sub-surface disposal in both countries as below. In Finland, waste management and disposal methods are regulated by Nuclear Energy Act and national policy. Low and intermediate level wastes are disposed into the cave in bedrock at each nuclear power plant site. In Sweden, safety handling and disposal of waste are regulated by Act on Nuclear Activities. The disposal of low and intermediate level wastes has been operated under the seabed. This operation is carried out by a joint company which the nuclear companies have formed. In addition, we reported a site selection, burial depth and financial plan etc. in both nations.