Pu含有率46%以下における(U, Pu)Oの熱伝導率

Thermal conductivities of (U, Pu)O containing up to 46% PuO

森本 恭一 ; 松本 卓; 小笠原 誠洋*

Morimoto, Kyoichi; Matsumoto, Taku; Ogasawara, Masahiro*

MOX燃料の熱伝導率に対するPu含有の影響については多くの研究者が測定を行っている。一方でこの影響について研究者の見解が一致していない。本研究ではPu含有率が246%の化学量論組成のMOX試料を準備し、熱伝導率におけるPu含有率依存性について調査した。本試験のPu含有率の範囲ではPu含有の影響は小さく、熱伝導率はPu含有率の増加にしたがってわずかに低下することがわかった

Many studies discussing the influence of Pu-content on thermal conductivities of MOX fuel have been conducted using experimental and calculation techniques. On the other hand, the disparity among these experimental results regarding the dependence of Pu-content on thermal conductivity is large and various researchers have expressed several different opinions about the influence of Pu-oxide addition on thermal conductivity. In this study, the stoichiometric MOX specimens containing from 2 to 46% of Pu were prepared and the thermal conductivities of them were measured with a laser flash apparatus. In the Pu-content range less than 46%, it was found that the influence of Pu-content on thermal conductivities was small and that the thermal conductivities decrease slightly and monotonically with an increase of Pu-content.