Preliminary investigation on applicability of subchannel analysis Code ASFRE to circulating flow region formed in a fuel subassembly of sodium cooled fast reactor

Tanaka, Masaaki  ; Kikuchi, Norihiro  ; Doda, Norihiro  ; Hamase, Erina ; Imai, Yasutomo*

During the decay heat removal operation including accident management in sodium-cooled fast reactor, appearance of the recirculation flow in the vertical direction with the upward and the downward flows due to the buoyancy and the gravity forces respectively is indicated in the fuel subassemblies. In this paper, the numerical simulation of the sodium test for a grid-spacer type fuel subassembly with a planer blockage at force convection condition was carried out. From the comparison of the temperature distribution between the measurement and the numerical results by ASFRE, potential capability of ASFRE to apply the recirculation flow region was indicated.