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安全性・経済性向上を目指したMA核変換用窒化物燃料サイクルに関する研究開発,3; $$alpha$$線自己照射損傷による結晶格子と焼結体膨張の相関

R&D on nitride fuel cycle for MA transmutation to enhance safety and economy, 3; Lattice and bulk expansion of nitride fuel pellet by self-irradiation damage

高野 公秀 ; 高木 聖也

Takano, Masahide; Takaki, Seiya

マイナーアクチノイドを高濃度に含有した燃料には、製造後の保管中に$$alpha$$線自己照射損傷による格子欠陥とHe原子の蓄積が速く進む。格子欠陥蓄積による結晶格子膨張はよく知られた現象であるが、バルク(焼結体)寸法変化に関する既存知見はほとんどない。ここでは、主要な$$alpha$$線源として$$^{244}$$Cmを添加した窒化物燃料ペレットを焼結し、室温保管時の格子定数と寸法の経時変化の相関データを取得した。

In the fuel containing minor actinides with high concentrations, lattice defects and He atoms accumulates quickly due to the self-irradiation damage of alpha-decay. The lattice expansion arising from the defects accumulation is well-known phenomenon, however, the knowledge relating to the bulk expansion have not been obtained yet. In this work we prepared a nitride fuel pellet containing $$^{244}$$Cm as a main alpha-emitter, and obtained data on the relationship between lattice and bulk expansion as a function of storage duration at room temperature.

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