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格子欠陥が蓄積したMA含有MOXペレットに対する熱処理の影響評価

Evaluation of annealing effect on MA-bearing MOX pellet with lattice defect

廣岡 瞬 ; 加藤 正人   ; 米野 憲 ; 砂押 剛雄*

Hirooka, Shun; Kato, Masato; Komeno, Akira; Sunaoshi, Takeo*

アルファ崩壊により格子欠陥が蓄積したMA含有MOXペレットを熱処理した結果、格子欠陥による密度低下は昇温に伴い回復したが、約1300$$^{circ}$$C以上では再び密度低下が起こった。熱処理後の試料の観察の結果、この密度低下は粒界に析出したHeポアが原因であることが分かった。

MA-bearing MOX pellets with lattice defect accumulated by alpha decay were annealed. The decreased density due to the lattice defect was recovered. However, the density started to decrease again above 1300$$^{circ}$$C. Ceramography of the annealed pellets showed that the density decrease was attributed by helium pores formed along grain.

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