Study of changes in melting behaviour of the UO $_{2}$ -Zircaloy-2 system induced by addition of magnetite at temperatures 2000 and 2100 $^{circ}$ C

Zubekhina, B. ; Pshenichnikov, A. ; 高野公秀

Zubekhina, B.; Pshenichnikov, A.; Takano, Masahide

Interactions in two systems UO $_{2}$ -Zircaloy and UO $_{2}$ -Zircaloy-magnetite were studied at temperatures 2000 and 2100 $^{circ}$ C during 30 min in argon atmosphere. It was shown that presence of relatively small amount of magnetite in UO $_{2}$ -Zircaloy system suppresses both UO $_{2}$ dissolution and diffusion of U from UO $_{2}$ to the melt. The average bulk content of U in molten Zry decreased 6 times for UO $_{2}$ -Zry-Fe $_{3}$ O $_{4}$ . Presence of magnetite also affects the composition of new-formed phases. A typical corium phase (U,Zr)O $_{2}$ was not observed due to influence of Fe $_{3}$ O $_{4}$ . The results obtained allow suggesting that presence of Fe $_{3}$ O $_{4}$ may affect the behaviour of UO $_{2}$ -Zry melt during severe accident progression.

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発表会議名	:	日本原子力学会2024年秋の大会
開催年月	:	2024/09
開催都市	:	仙台
開催国	:	日本
キーワード	:	福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident

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Study of changes in melting behaviour of the UO-Zircaloy-2 system induced by addition of magnetite at temperatures 2000 and 2100C

Study of changes in melting behaviour of the UO $_{2}$ -Zircaloy-2 system induced by addition of magnetite at temperatures 2000 and 2100 $^{circ}$ C