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地層処分における微生物の影響に関する調査

Investigation of microbiologial effect on geological disposal

吉川 英樹; 油井 三和; 佐々木 憲明; 福永 栄*; 朝野 英一*; 若松 久夫*

not registered; Yui, Mikazu; Sasaki, Noriaki; not registered; Asano, Hidekazu*; not registered

放射性廃棄物の地層処分では処分環境の変化や核種移行の評価において微生物の存在を考慮する必要があると言われているが、その具体的な挙動や影響については不明な部分が多い。そこで本テーマに関して、地層処分における微生物の挙動や影響に関する情報の整理、研究の現状、今後の課題などについて文献調査を行った。またあわせて関連する学会、講演会および海外の主要な原子力研究機関の研究内容についてアンケート調査を行った。本調査により、微生物の代謝活動に基づく材料の生物的な劣化、物理的な破壊、ガス生成、地下水の化学的特性の変化および核種の直接取り込みなどの作用が考えられ、それらが廃棄体やバリア材の劣化、処分場の化学的な環境の変化、放射性核種の移行などを通じて処分場の閉込め性能に影響することが明らかとなり研究の重要性が確認できた。また研究の進捗度について世界的な観点からの知見が得られた。

Geomicrobiology for the geological disposal of radioactive wastes and the assessment of potential microbial effects on chemical and physical changes in repository environments and nuclide transport have been pointed out to be of cardinal importance. However, the detailed effects of microbes are poorly understood. In order to study microbial activities in underground and their effects on a repository and to know the recent study status, a literature survey was performed. In addition to this, the current research activities of major research laboratories in the world were investigated. And microbiology related meetings and conferences were also searched. In the literature survey, biodegradation and physical disruption of materials, gas generation, alteration of ground-water chemistry and the direct uptake of radionuclides were identified as factors which potentially affect the nuclide containment capability of the repository. And through the search for laboratories and meetings, information on the most recent status of biological study on the underground repository and on conferences related to geomicrobiology were obtained, respectively.

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