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Chemical state analysis of simulated corium debris by EXAFS

EXAFSによる模擬デブリの化学状態分析

岡本 芳浩; 高野 公秀 

Okamoto, Yoshihiro; Takano, Masahide

ウラン,ジルコニウム,鉄,カルシウムおよびランタノイドを含む模擬デブリ試料の化学状態を、放射光EXAFS分析によって調べた。試料中のウランは、蛍石型あるいはC型配位構造に分類された。U$$_{0.27}$$Zr$$_{0.63}$$Fe$$_{0.05}$$Ca$$_{0.05}$$O$$_2$$試料では、単相からなるにも関わらず、短いU-O間距離が観察されたことなどから、ウランが5価で存在しているものとみられる。U-Zr-OおよびU-Zr-Fe-O系試料におけるジルコニウムの配位構造は正方晶ZrO$$_2$$によく似ていたが、カルシウムが加わるとカルシア安定化ジルコニア(CSZ)に変化した。

Chemical state of some simulated corium debris samples containing uranium (fuel), zirconium (fuel cladding), iron (structure material), calcium (cement) and lanthanides (fission products) was investigated by synchrotron radiation based extended X-ray absorption fine structure (EXAFS) analysis. The local structure of uranium for the simulated debris was classified into fluorite UO$$_2$$ structure and C-type structure (stabilized cubic). The U$$_{0.27}$$Zr$$_{0.63}$$Fe$$_{0.05}$$Ca$$_{0.05}$$O$$_2$$ sample, which consists of single phase (C-type), shows slightly shorter U-O distance. It can be concluded that the sample contains pentavalent uranium. The local structure of zirconium for U-Zr-O and U-Zr-Fe-O systems was very close to tetragonal ZrO$$_2$$, while that of zirconium changed to CSZ (calcia stabilized cubic) by adding calcium.

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