Performance Analysis on the Two-Row Hexagonal Fuel Assembly for Super Critical Water-Cooled Reactor

MCATHAS system,which is a code of coupled neutronics/thermal-hydraulics,is used for the calculating of the two two-row hexagonal fuel assemblies.Considering the mutual influence between the axial obvious evolution of density and temperature of the coolant and moderator and the relative power distribution,the results show the two-row hexagonal fuel assemblies keep the balance between uniform moderation and sufficient moderation.The radial power peaking factor of the D6-1 assembly in the paper is less than 1.10 under the condition of using the same enrichment fuel and without the burnable poison.In addition,due to the longer heated perimeter and the litter flow area of the assembly gap region,the conductivity of the assembly box needs to be smaller by adding some adiabatic material.