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Report No.
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Interdiffusion behavior of Pu and Am in MOX fuels

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

The diffusion couples of (U$$_{0.50}$$Pu$$_{0.47}$$Am$$_{0.03}$$)O$$_{2-x}$$ and UO$$_2$$ were annealed at 1873K in an atmosphere of $$Delta$$G$$_{O2}$$ that correspond to O/M = 2.00 or 1.96, and the concentration profile of each actinide elements around the interface was measured with EPMA. It was clearly found that 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, for O/M = 1.96, grain boundary and bulk diffusions of these actinides were not clearly observed.

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