A major concern for ITER operation in H-mode with high fusion gain is the occurrence of disruptions which can damage Plasma Facing Components (PFCs) and therefore limit their lifetime. Moreover, Runaway Electrons (RE) can be generated and further damage the first wall. Numerical simulations of consequence of RE impact at the PFCs are carried out for JET and ITER conditions. This work is focus on the benchmark of the codes (ENDEP and MEMOS) used for predictive modeling for ITER with experimental observations of RE beams in JET. Reasonable qualitative and quantitative agreements between numerical simulations and experiments at JET are demonstrated. Numerical simulation carried out for Be first wall demonstrated that mechanism of the surface evaporation significantly influence on melt layer thickness for metallic PFCs under RE impact.