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高速炉MOX燃料用酸素ゲッターの開発; 候補材の選定と被覆管装荷方法の検討

Feasibility study of oxygen getter for FBR MOX fuel; Selection of material and examination of loading method into a cladding

森平 正之; 瀬川 智臣

Morihira, Masayuki; Segawa, Tomoomi

高速増殖炉サイクル実用化研究開発(FaCTプロジェクト)では250GWd/t(集合体ピーク)の高燃焼度を達成するためペレットの低O/M比化によるFCCI低減を目指しているが、量産規模での高精度の酸素ポテンシャル制御の実現性や、自己発熱の大きい低除染TRU燃料ペレットの再酸化を勘案すると、実用プラントにおける低O/M比ペレットの量産には多大な困難が伴う可能性がある。そこで、照射中に生じる余剰酸素の吸収を燃料ピン内に装荷した酸素ゲッターに担わせることにより、ペレットそのもののO/M比を緩和する代替案を検討した。本研究では、酸素ゲッターとしての要件を満たす候補材のサーベイと、被覆管装荷方法の検討を実施した。

The "FaCT project" is a program toward the commercialization of FBR cycle carried out in JAEA. High burn-up of 250 GWd/HMt at bundle peak is targeted in the project. To restrain the fuel cladding chemical interaction (FCCI) in a high burn-up, adoption of low O/M ratio pellets is chosen. Considering the difficulty of accurate oxygen potential control in a commercial scale electric furnace as well as the difficulty of keeping O/M ratio of sintered pellets under the high decay heat from the low decontaminated TRU MOX, it may be difficult to realize commercial mass production of low O/M ratio pellets. If so, excess oxygen released during irradiation should be absorbed by an oxygen getter not but in the matrix of low O/M ratio MOX pellets. Then MOX pellets with higher initial O/M ratio can be acceptable. In this research, a selection of oxygen getter candidates was carried out with the examination of their loading method in a cladding.

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