Study on discharge behavior of molten core materials in core on core disruptive accidents of sodium cooled fast reactors; Consideration on discharge behavior through a sodium-filled channel with an internal structure

Kato, Shinya  ; Matsuba, Kenichi  ; Kamiyama, Kenji  ; Mikisha, A.*; Akayev, A.*; Vurim, A.*; Baklanov, V.*

In order to enrich experimental knowledge of discharge behavior of molten core materials through a sodium-filled channel in core disruptive accidents of sodium cooled fast reactors, an out-of-pile experiment was conducted, in which molten alumina was used as a molten-fuel simulant and it penetrated into a sodium-filled channel with an internal structure reducing a flow area. In this presentation, consideration on effects of the internal structure on melt discharge-behavior will be presented based on experimental results.