SIMMER-III code assessment for material expansion dynamics during core disruptive accidents in sodium-cooled fast reactors

Yamano, Hidemasa   ; Tobita, Yoshiharu

In this paper, detailed descriptions are given for two representative experimental analyses (VECTORS and OMEGA), which are intended to validate high speed multi-phase flow dynamics in pin bundle structure and large vapor bubble expansion dynamics into a coolant pool, respectively. Through the experimental analyses, the SIMMER-III code has proved to be basically valid both numerically and physically, with currently applicability to integral reactor safety calculations.