6. Depletion

DDNRS-ERSN supports coupled depletion, or burnup, calculations through the EVO: module. DRAGON5 solves the transport equation to obtain transmutation reaction rates, and then the reaction rates are used to solve a set of transmutation equations that determine the evolution of nuclide densities within a material. The nuclide densities predicted as some future time are then used to determine updated reaction rates, and the process is repeated for as many timesteps as are requested.