A discussion on impurity production at vertical targets and impurity transport to the core plasma during type I ELMs at the 1 GW m-2 level is given for ITER-FEAT. It is assumed that ELMs deposit their energy into complex layers with considerable surface roughness and drastically reduced heat conductivity. For impurity production, evaporation from target hot spots as produced during disruptions, and evaporation from levitated dust particles and redeposited material is taken into account. First estimations show that ELM energies have to be below 2 MJ assuming the wetted area as 5 m2 in order to arrive at impurity densities close to the x-point well below 1014 cm-3 for tungsten and below 1 MJ for impurity densities 1015 cm-3 for carbon. Larger impurity densities have the potential to dissipate a considerable fraction of the thermal energy of the core plasma.