  Plasma Surface Interaction(PSI) effects on plasma burn-through are compared
for the carbon wall and the ITER-Like Wall(ILW) at JET. For the carbon wall,
the radiation barrier and C2+ influx have a significant linear correlation
whereas the radiation barrier in the ILW does not have such a linear
correlation with Be 1+ influx. The JET data are explained by the simulation
results of the DYON code. The radiation barrier in the carbon wall JET is
dominated by the carbon radiation, but the radiation barrier in the ILW is
mainly from the deuterium radiation rather than the beryllium radiation.
