APPLICATION OF THE COORDINATE TRANSFORMATION IN NODAL DIFFUSION CALCULATIONS OF RADIALLY EXPANDING SFR CORES

摘要

In this study, the coordinate transformation technique was assessed for radial expansion ofSodium cooled Fast Reactor (SFR) cores with the focus on time-dependent calculations.This method was implemented into nodal diffusion code DYN3D and was tested againstthe already available direct mesh expansion model. The newly implemented method wastested for uniform radial core expansion cases. Within DYN3D, the coordinate transformationmethod was verified on steady-state cases and was validated on one of the transientscenarios from the Phenix reactor experiments. The obtained results demonstrate equivalencebetween the coordinate transformation and direct mesh expansion techniques andtherefore presenting the viability of the former one in transient calculations of SFR cores.