Development of design evaluation tools for the JSFR fuel transfer pot

•JSFR is going to adopt an advanced fuel handling system.•A three dimensional analysis model for heat transfer evaluation of the JSFR fuel transfer pot has been developed.•The heat transfer models inside and outside the pot have been validated by reference experiments.•For a simpler design tool, a two dimensional analysis model has been developed.

JSFR is going to adopt an advanced fuel handling system. As for ex-vessel spent fuel handling, a transfer pot with two fuel subassembly positions has been developed so as to shorten refueling period increasing plant availability. The pot is required to provide sufficient cooling capability in case of transportation malfunction. In this study, a three dimensional analysis model for heat transfer evaluation of the JSFR fuel transfer pot has been developed. The heat transfer models inside and outside the pot have been validated by reference experiments. Using the developed three-dimensional model, the JSFR fuel transfer pot has been analyzed. For a simpler design tool, a two dimensional analysis model has been developed. Comparison of the three and two dimensional analyses shows that two dimensional analyses could estimate pot cooling performance conservatively.