Modeling of Circulating Nuclear Fuels with COMSOL Multiphysics

A. Cammi, V. Di Marcello, and L. Luzzi
Politecnico di Milano, Department of Nuclear Engineering, Milan, Italy

This paper presents multiphysics modeling of a circulating nuclear fuel in a simple geometry by means of COMSOL Multiphysics.

Among the Circulating Fuel Reactors (CFR), the most promising is the Molten Salt Reactor (MSR). Physics of such circulating nuclear fuel requires five coupled equations of conservation laws: the momentum balance, the energy balance, the neutron balance and the precursors balance.

In this complex field, represented by the coupling of thermal-hydrodynamics with neutronics, the highly non-linear regime and the wide disparity of time scales, COMSOL was used to investigate the region of the reactor that comprises only the flowing fluid, and a parametric study was performed by varying the size of the analyzed region and the inlet velocity of fluid.