The methods of an analysis of the critical safety of process tanks in the Recuplex installation are discussed and results of the analysis are tabulated in this report. A minimum critical condition for a thermal chain reaction is estimated for 0-200 MWD/T Pu and for 400 MWD/T Pu for each tank in the installation vhich normally contains, or could contain, plutonium. All estimates are based on experimental critical mass data from the P-11 project and from Oak Ridge critical mass experiments.