Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors, 17; Reaction behavior between molten stainless steel and solid boron carbide

Nakamura, Kinya*; Ota, Hirokazu*; Emura, Yuki; Takai, Toshihide  ; Yamano, Hidemasa   

The purpose of this study is to develop the behavior analysis model of control rods that seem to melt and relocate prior to fuel melting during a core disruptive accident in a sodium-cooled fast reactor. The authors measured the concentration distribution of molten stainless steel (SS) and also the SS that reacted with the neutron-absorbing material, BC, at a high temperature. It showed that the boron concentration was uniform in a horizontal direction. In a vertical direction, however, it became lower toward the bottom.