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Thermal conductivity measurement of (Pu$$_1$$$$_-$$$$_x$$,Am$$_x$$)O$$_2$$ (x=0.03, 0.07)

(Pu$$_1$$$$_-$$$$_x$$,Am$$_x$$)O$$_2$$ (x=0.03, 0.07)の熱伝導率

松本 卓*; 有馬 立身*; 稲垣 八穂広*; 出光 一哉*; 加藤 正人; 森本 恭一; 小笠原 誠洋*

Matsumoto, Taku*; Arima, Tatsumi*; Inagaki, Yaohiro*; Idemitsu, Kazuya*; Kato, Masato; Morimoto, Kyoichi; Ogasawara, Masahiro*

高レベル放射性低減という観点からMAをMOX燃料に添加したMA-MOX燃料が考えられている。MOX燃料の燃料設計や性能評価においてさまざまな熱物性値が必要であるが、その中でも熱伝導率は最も重要なパラメータの一つである。PuO$$_2$$はMOX燃料の構成成分の一つであり、その熱伝導率を評価することはPu含有率の影響を把握するうえで重要である。しかしPuO$$_2$$の熱伝導率データは少なく、報告値は文献ごとに異なる。またAm含有の影響を評価した文献も少ない。そこで本報告ではAmを最大7%含有したPuO$$_2$$の熱伝導率の測定及びPuO$$_2$$の熱伝導率へのAm含有の影響について発表を行う。

Development of minor actinide (MA) bearing MOX fuels has been advanced to reduce high level waste. In the development of such new type fuels, it is important to understand physical properties. The thermal conductivity is one of the important properties for development of the fuels, and effect of PuO$$_2$$ and AmO$$_2$$ content on thermal conductivity was investigated. A few thermal conductivity of PuO$$_2$$ were reported previously, which differ widely in the measured data. The data of Am-containing MOX were also measured, but the effect of Am was unclear because of low Am content. In the present work, thermal conductivity of (Pu,Am)O$$_2$$ was measured, and the effect of Am content was evaluated to contribute to analyze thermal conductivity of MA-bearing oxide fuels.

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