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高速炉MOX燃料用酸素ゲッター材の開発,2; 候補材と燃料の共存性評価

Development of oxygen getter materials for FBR MOX fuel, 2; Evaluation of the compatibility of candidate materials with UO$$_{2}$$ and FMS

瀬川 智臣 ; 森平 正之 ; 滑川 卓志; 松山 慎一郎*; 油田 良一*; 水迫 文樹*

Segawa, Tomomi; Morihira, Masayuki; Namekawa, Takashi; Matsuyama, Shinichiro*; Yuda, Ryoichi*; Mizusako, Fumiki*

酸素ゲッター候補材とするZr, TiとUO$$_{2}$$及びSUS被覆材との共存性を評価するために、Zr-FMS, Ti-FMS, Zr-UO$$_{2}$$, Ti-UO$$_{2}$$の4種類のディスク対の用いた加熱試験を行い、試料の界面の状態について調べた。試験の結果から、今回の試験条件下では、ZrとUO$$_{2}$$及びFMSとの間で反応は見られないことがわかった。TiとFMSの共存性試験の結果、700$$^{circ}$$C, 100hの加熱試験後のTi側には最大厚さ14$$mu$$mのTi-Fe-O相が形成されたが、FMS側へのTiの拡散は見られなかった。TiとUO$$_{2}$$の共存性試験の結果、Ti側の表面に微量のUが確認され、当該位置の酸素濃度が極めて低い場合があることから、Ti-Uの合金または酸化物の反応相が生成したと考えられる。TiはUO$$_{2}$$, FMSと反応相を生成したが、いずれもTi側に生じた限定的なものであり、UO$$_{2}$$燃料及びFMS被覆管の健全性に影響するものではないと考えられる。

Heating tests were carried out for the disc pares of Zr-FMS, Ti-FMS, Zr-UO$$_{2}$$ and Ti-UO$$_{2}$$ to evaluate the compatibility of the candidate materials of oxygen getter with UO$$_{2}$$ and FMS, and the interfaces of each disc were investigated. No reaction was observed between Zr and UO$$_{2}$$ also FMS in the test conditions. For Ti and FMS, Ti-Fe-O phase with the maximum thickness of 14 $$mu$$m was formed in the Ti disc at 700$$^{circ}$$C for 100 h but no penetration of Ti into FMS disc was observed. For Ti and UO$$_{2}$$, Ti-U or Ti-U-O phase were formed near the surface of the Ti disc but these were limited in Ti disc side. No penetration of Ti into UO$$_{2}$$ disc was observed. As a result, it is considered that no harmful influence is expected for Zr and Ti on the integrity of UO$$_{2}$$ and FMS cladding.

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