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Fuel restructuring behavior analysis of MA-bearing MOX fuels irradiated in a fast reactor

高速炉におけるMA含有MOX照射燃料の燃料組織変化挙動

小澤 隆之; 生澤 佳久; 加藤 正人

Ozawa, Takayuki; Ikusawa, Yoshihisa; Kato, Masato

廃棄物減容・有害度低減を目指したリサイクルシステムにおいてはMAを高速炉でMA-MOX燃料としてリサイクルする研究開発を進めており、MA含有率は約5wt%と想定されている。このため、MA含有が燃料物性だけでなく燃料挙動に及ぼす影響ついて研究する必要がある。高速炉においてMOX燃料は比較的高い線出力で使用されることから、燃料組織変化が生じ、その結果、中心空孔が形成される。この中心空孔形成は燃料中心温度を低減する効果があるため、燃料溶融防止の観点で重要な燃料挙動である。ここでは、常陽で実施したMA-MOX燃料の照射試験であるB11とB14の結果を用いて、MA含有が燃料組織変化挙動に及ぼす影響を評価した結果について報告する。

A recycle system for minor actinides (MAs), in which MAs are recycled by reprocessing and irradiating them in a fast reactor, is studied to reduce the degree of hazard and the amount of high-level radioactive wastes. MAs would be used as mixed oxide (MOX) fuels with plutonium and uranium in fast reactors. Since MA content of MA-bearing MOX (MA-MOX) to be used in fast reactors is assumed to reach $$sim$$5 wt%HM, the effects on not only fuel properties but also fuel behaviors have to be estimated to use MA-MOX as fast reactor fuels. As the MOX fuels to be used will be irradiated at a comparably high linear power and the fuel center temperature would be assumed to be over 2,273 K during irradiation in the fast reactors, fuel restructuring would take place due to void migration towards the fuel center under the radial temperature gradient, and a central void would be formed. Since the fuel center temperature would be decreased by the effect of formation of the central void, the fuel restructuring is one of the most important behaviors for fast reactor fuels. In this study, the effect of MA content on fuel restructuring behavior was estimated from the results of irradiation experiments such as B11 and B14 performed in Joyo to study the irradiation behaviors of MA-MOX and the calculation results using a fuel restructuring model which can take into account MA-MOX dependence on vapor pressure.

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