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Basic visualization experiments on eutectic reaction between boron carbide and stainless steel under sodium-cooled fast reactor conditions

ナトリウム冷却高速炉条件における炭化ホウ素とステンレス鋼の共晶反応可視化基礎実験

山野 秀将; 鈴木 徹; 神山 健司; 工藤 勇*

Yamano, Hidemasa; Suzuki, Toru; Kamiyama, Kenji; Kudo, Isamu*

本報は、我が国で設計されている第4世代ナトリウム冷却高速炉(750MWe級)における炉心損傷事故での溶融炉心の炭化ホウ素(B$$_{4}$$C)とステンレス鋼(SS)の共晶反応及び移動挙動の重要性を示すとともに、それらの挙動に着目した1500$$^{circ}$$Cを超える高温条件下での可視化基礎実験について発表する。まず、予想される挙動を考慮して厳密摂動計算ツールを用いて反応度推移を計算し、B$$_{4}$$C-SS共晶生成物移動挙動が大きな不確かさを持っており反応度推移のうえで重要であることを示した。この挙動を明らかにするため、高温加熱炉の中に溶融SSをB$$_{4}$$Cペレットに接触させ、その反応を可視化する基礎実験を実施した。その実験により、共晶反応を可視化するとともに、固化した試験体の上部で密度分離によりB$$_{4}$$C-SS共晶生成物が固化・移動した様子が示された。

This paper describes basic visualization experiments on eutectic reaction and relocation of boron carbide (B$$_{4}$$C) and stainless steel (SS) under a high temperature condition exceeding 1500$$^{circ}$$C as well as the importance of such behaviors in molten core during a core disruptive accident in a Generation-IV sodium-cooled fast reactor (750 MWe class) designed in Japan. At first, a reactivity history was calculated using an exact perturbation calculation tool taking into account expected behaviors. This calculation indicated the importance of a relocation behavior of the B$$_{4}$$C-SS eutectic because its behavior has a large uncertainty in the reactivity history. To clarify this behavior, basic experiments were carried out by visualizing the reaction of a B$$_{4}$$C pellet contacted with molten SS in a high temperature-heating furnace. The experiments have shown the eutectic reaction visualization as well as freezing and relocation of the B$$_{4}$$C-SS eutectic in upper part of the solidified test piece due to the density separation.

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