Subchannel Analysis for Thorium-Based Advanced CANDU Reactor

This paper presents the subchannel thermal hydraulic analysis in different thorium loading modes,different power and different lifetime using ASSERT-PVV3R1,a subchannel computer code developed by AECL,to determine the best loading mode from the point of view of subchannel thermal hydraulics.According to the results for subchannel the mass flux,void fracition and outset of dry power,a best loading mode is established from the point of view of being calm and security to power,i.e.,the loading mode of ThO₂ and SEU mixing in pellets is obviously better than the loading mode in which the only ThO₂ is loaded in the internal eight rods.