An influence of core physics peculiarities upon the thermal hydraulicsperformance in Cascade Subcritical Molten Salt Reactor

摘要

This paper presents the results of investigation of the influence of core physicsrnpeculiarities upon thermal hydraulics and workability of the main structures inrnCascade Subcritical Molten Salt Reactor. Different variants of the target have beenrnconsidered. Revealed it has been that the optimal variant of the target design (fromrnpoint-of-view neutron efficiency + coolability) corresponds to the tight tungsten rodrnbundle packed in hexagonal lattice cooled by the same molten salt as being circulatedrnin the central core zone. The limit of the power volumetric density in the tungsten rodsrnhas been defined from the thermal physics and thermal mechanics calculationalrnestimations. The results are demonstrated of research of the central core zone thermalrnphysics for a few variants differed by the combinations of the coolant, structures andrnfuel in the central zone. Different variants of circulation (forced and natural) of therncoolant in the central zone have been considered from view-point of workability ofrnthe central zone structures under condition of the great power rate. The questions ofrnworkability of the Intermediate Heat Exchangers of the central and peripheral corernzones for different variants of reactor design are also discussed.