RI・研究所等廃棄物余裕深度処分施設の概念設計III

The Conceptual Design of Waste Repository for Radioactive Waste from Medical, Industrial and Research Facilities Containing Comparatively High Radioactivity III

景山 仁志*; 赤堀 邦晃*

Kageyama, Hitoshi*; Akahori, Kuniaki*

RI・研究所等廃棄物については、平成12年3月に原子力バックエンド対策専門部会が「超ウラン核種を含む放射性廃棄物処理処分の基本的考え方」において、廃棄物の物理化学的性状と放射能濃度に応じて適切に区分し、それぞれの区分に応じた処分方策を講じるとした基本的考え方が提示された。また、原子炉施設の運転と解体に伴い発生する低レベルは放射性廃棄物のうち、余裕深度処分対象廃棄物に関してはその濃度上限値が法令で定められた。RI・研究所等廃棄物のうち余裕深度処分対象廃棄物に関しては、上記の動向を踏まえ検討が開始され、平成14年度までの検討において概念検討に関わる一通りの評価検討が実施された。 本研究では最新の廃棄体特性データをもとに遮へいの観点から廃棄体容器の最適化を図り、その結果に基づく処分施設の成立性の検討と処分コストの算定を実施した。

Advisory Committee on Nuclear Fuel Cycle Backend Policy reported the basic approach to the RI and Institute etc. wastes on March 2002. According to it, radioactive waste form medical, industrial and research facilities should be classified by their radioactivity properties and physical and chemical properties, and should be disposed in the appropriate types of repository with that classification. For the radioactive waste containing comparatively high radioactivity generated from reactors, NSC has established the Concentration limit for disposal. NSC is now discussing about the limit for the radioactive waste from medical, industrial and research facilities containing comparatively high radioactivity. Japan Nuclear Cycle Development Institute (JNC) has studied about the feasibility and the cost of the disposal for radioactive waste from medical, industrial and research facilities. This study was started to renew to latest data of the radioactive waste. And at the point of shielding from radiation, the waste was categorized by activity of nuclide in waste container. Then the safety assessment and the prediction of cost of the disposal performed.