Is that IGBT will failure if apply Vce with out gate pulse, and driver supply
If you left the gate open and applied 100VDC of the correct polarity the IGBT can and will fail even though nobody makes IGBTs with drain source ratings so low .                           This can be because the high impedence           gate can have a static charge on it .If the static voltage isnt enough to destroy the gate oxide layer its often enough to turn the device half on .This could result in extremely high power dissipation destroying the device .IGBTs arnt happy in analog mode and generally are not specified for linear operation.Place a 1K resister between gate and source to avoid blowing up the next device .Nondestructive testing .