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Report No.
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The Effect of O/M ratio on inter-diffusion of uranium and plutonium in MOX fuel

Matsumoto, Taku; Morimoto, Kyoichi; Kato, Masato; Tamura, Tetsuya*; Uno, Hiroki*

The O/M ratio dependence on inter-diffusion of uranium and plutonium was evaluated by isothermal diffusion tests using diffusion couples consisting of (U$$_{0.51}$$Pu$$_{0.46}$$Am$$_{0.03}$$)O$$_{2-x}$$ and UO$$_2$$ disks. The inter-diffusion coefficient at O/M = 1.992 was about two orders of magnitude greater than that at O/M = 1.942. In addition, significant grain boundary diffusion was observed at O/M = 1.992.

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