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MOX燃料拡散対を用いたアクチニド元素の相互拡散評価

Inter-diffusion study of actinides in a MOX diffusion couple

松本 卓; 有馬 立身*; 稲垣 八穂広*; 出光 一哉*; 加藤 正人; 森本 恭一; 宇野 弘樹*; 田村 哲也*

Matsumoto, Taku; Arima, Tatsumi*; Inagaki, Yaohiro*; Idemitsu, Kazuya*; Kato, Masato; Morimoto, Kyoichi; Uno, Hiroki*; Tamura, Tetsuya*

(U$$_0.51$$Pu$$_0.46$$Am$$_0.03$$)O$$_{2-x}$$とUO$$_2$$の拡散対を1600$$^{circ}$$Cで熱処理し、U及びPuの相互拡散係数のO/M依存性を評価した。O/M=2.00における相互拡散係数は1.96のものに比べ1桁-2桁程度大きい値となった。また、O/M=2.00において顕著な粒界拡散が確認できたが、O/M=1.96では確認できなかった。

O/M ratio dependence of inter-diffusion coefficient of U and Pu at 1873 K was evaluated from MOX and UO$$_2$$ diffusion couple. The diffusion coefficient at O/M = 2.00 was about two orders of magnitude greater than that at O/M = 1.96. In addition, it was observed that grain boundary diffusion is so large compared to bulk one for O/M = 2.00. On the other hand, GB and bulk diffusions were not clearly observed for O/M = 1.96.

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