[en] In this work, methods to evaluate and apply interface discontinuity factors for the reactor simulator DYN3D are discussed. Both Generalized Equivalence Theory and Black-Box Homogenization interface discontinuity factors were considered. As DYN3D is based on the nodal expansion approach, it has been extended to allow for generating interface discontinuity factors for both its nodal and pin level diffusion solution. Selected verification cases utilizing the lattice codes SCALE 6.1/TRITON and Serpent 2.1.15 are presented. Applying interface discontinuity factors, DYN3D reproduces given reference solutions in almost all cases. If strong absorbers dominate at least one of the cells of the geometry, small residual errors attributable to DYN3D's solution algorithm are observed. Producing interface discontinuity factors for a problem as a whole typically proves to be computationally prohibitive. Hence, PWR application cases in which interface discontinuity factors were generated for a number of super-cells of the geometry were analyzed. The potential of the interface discontinuity factors to improve the DYN3D solution was found to depend heavily on the suitable choice of super-cells. (authors)