Investigation on applicability of subchannel analysis code ASFRE to thermal hydraulics analysis in fuel assembly with inner duct structure of sodium cooled fast reactor

Kikuchi, Norihiro  ; Imai, Yasutomo*; Yoshikawa, Ryuji  ; Doda, Norihiro  ; Tanaka, Masaaki  

In the design study of an advanced sodium-cooled fast reactor (Advanced-SFR) investigated in JAEA, the use of a specific fuel assembly with an inner duct structure called FAIDUS has been investigated to enhance safety of Advanced-SFR. Since the fuel rods have an asymmetric layout by the inner duct, the validity confirmation of the numerical results of an in-house subchannel analysis code named ASFRE was required. In this paper, therefore, the code-to-code comparisons was applied with numerical results of ASFRE and those of an in-house CFD code named SPIRAL. The applicability of ASFRE was indicated through the confirmation of the consistency of specific temperature distributions.