This document is a copy of a memo dated October 30, 1956. Since the start-up of the Purex Plant, numerous process and equipment difficulties have been encountered in the concentration of plutonium in the L Cell Package. A summary of these problems and their resolutions was being documented by the Purex Technology Operation. One of the proposed remedial measures for improving on the present plutonium concentration equipment in the Purex Plant was to install new equipment constructed of more corrosion resistant materials and of a design simplified for contact maintenance.