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(U,Ce)O$$_{2}$$の熱伝導率評価

Evaluation of (U,Ce)O$$_{2}$$ thermal conductivity

廣岡 瞬 ; 加藤 正人   ; Nelson, A.*; McClellan, K.*; White, J.*

Hirooka, Shun; Kato, Masato; Nelson, A.*; McClellan, K.*; White, J.*

O/Mをパラメータとして(U,Ce)O$$_{2}$$の熱拡散率を測定し、熱伝導率を導出した。(U,Ce)O$$_{2}$$の熱伝導率は(U,Pu)O$$_{2}$$のそれと比べて、温度上昇に伴い急激に低下する傾向が確認された。O/Mが2のときをピークとして、ハイパーストイキオメトリ側・ハイポストイキオメトリ側ともに、O/Mが2から離れると熱伝導率は低くなる結果が得られた。

Thermal diffusivity of (U,Ce)O$$_{2}$$ was measured as a function of O/M, and the thermal conductivity was calculated. Thermal conductivity of (U,Ce)O$$_{2}$$ decreased more sharply with increasing temperature compared with that of (U,Pu)O$$_{2}$$. Also, thermal conductivity of (U,Ce)O$$_{2}$$ showed the highest peak at O/M of 2 and decreased as the O/M is apart from 2 on both hypo-stoichiometric and hyper-stoichimetric regions.

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