This note summarises the work performed on vertical stability studies during the plasma start up in the ITER TAC3 and T AC4 configurations. The main aim of this work is to analyse the plasma stability properties at low plasma current when the effect of vessel-blanket eddy current is substantial. The main tool used for this work is the PROTEUS code [9] in its direct implementation as used for the pumped divertor design. Some details of the calculation techniques and difficulties encountered are illustrated with the aim of providing the JCT with some easily reproducible and extendible work.