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放射性廃棄物に含まれる有害物質等に関する検討

Study on hazardous substances contained in radioactive waste

黒木 亮一郎; 高橋 邦明

Kuroki, Ryoichiro; Takahashi, Kuniaki

日本原子力研究開発機構が保有する放射性廃棄物の処理処分方策を今後さらに合理的かつ具体的に進めるためには、廃棄体技術基準が制定される必要がある。そのため、現行の法規制で未整備であるTRU廃棄物の廃棄体技術基準案を構築するにあたり、廃棄体中に含まれる可能性のある環境に影響を与える有害物質とTRU廃棄物に含まれる核分裂性核種による臨界の影響について検討し、以下の成果を得た。(1)TRU廃棄物に含まれる有害物質にかかわる関係法令を整理した。(2)英国,米国及び仏国における有害物質の影響評価事例を調査し、その知見を整理した。(3)各処分区分別に、主要な有害物質について物質移行評価を実施し、有害物質の制限量を算出した。(4)核種の濃集及び蓄積による臨界評価を実施し、処分の実態を考慮すれば臨界の可能性はほとんどないことが判明した。

The environmental impact of hazardous materials and possibility of criticality were investigated to construct technical specification of radioactive waste packages. The contents and results are as following. (1) Concerning hazardous materials included in TRU waste, regulations on disposal of industrial wastes and on environmental preservation were investigated. (2) The assessment methods for environmental impact of hazardous materials included in radioactive waste in U.K, U.S.A. and France were investigated. (3) The upper limits of amounts of hazardous materials in waste packages to satisfy the environmental standard were calculated with mass transport assessment for some disposal concepts. (4) It was suggested from criticality analysis for waste packages in disposal facility that the occurrence of criticality was almost impossible under the realistic conditions.

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