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Physical properties and irradiation behavior analysis of Np- and Am-bearing MOX fuels

Np/Am含有MOX燃料の物性値と照射挙動評価

加藤 正人; 前田 宏治; 小澤 隆之; 鹿志村 元明; 木原 義之

Kato, Masato; Maeda, Koji; Ozawa, Takayuki; Kashimura, Motoaki; Kihara, Yoshiyuki

高速炉リサイクルの実用化に向けてマイナーアクチニド含有MOX燃料の物性値と照射挙動が評価された。物性値は、マイナーアクチニド含有率や$$O$$/$$M$$比などをパラメータとして物性式を作成し、照射挙動評価に用いた。マイナーアクチニド含有MOX燃料は$$O$$/$$M$$比をパラメータとして、常陽で照射試験が行われ、照射後試験において、組織変化及びアクチニド元素の再分布挙動が評価された。物性式を用いて燃料の温度解析を行い、燃料は到達線出力430W/cmで、2680Kまで達したと評価された。

Physical properties and irradiation behavior of minor actinide-bearing MOX were evaluated for the development of advanced fast reactor fuels. The physical properties of the fuels were described as functions of minor actinide content and oxygen-to-metal ($$O$$/$$M$$) ratio, and the effect of minor actinide addition into MOX on those properties was found to be negligibly small. The irradiation tests of fuel pellets having $$O$$/$$M$$ ratios of 1.98 or 1.96 were carried out at high linear heat rate of about 430W/cm. The redistribution of actinide element and oxygen were analyzed by using the evaluated properties, and maximum temperatures of the pellets were estimated. The maximum temperature of the pellets of $$O$$/$$M$$=1.96 was estimated to reach 2680K which was 130K higher than that of $$O$$/$$M$$=1.98 pellets. The maximum temperature of the pellet was lower as compared with its melting temperature of higher than 3000K. In the results of post-irradiation examination, no trace of melting was observed.

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