Masaki Takeshima

Development of a laundry waste treatment system

Abstract Fundamental and pilot plant experiments developed a laundry waste treatment system for nuclear power plants, consisting of a reverse osmosis unit for removal of radioactive materials and pre-concentration, and an evaporator for the final concentration. A sponge ball cleaning method was employed for the reverse osmosis unit and a heat-resistant antifoam reagent for the evaporator. The pilot plant test, using simulated wastes, showed a decontamination factor of above 10 3 and a volume reduction ratio of 10 −3 .

Development of a sponge metal catalyst for a recombiner

Fundamental and pilot plant experiments have been carried out to develop a new recombiner catalyst with high catalytic activity and less deterioration at high temperature. The catalyst is prepared by electroplating palladium over a chromium layer, which in turn has been plated onto a sponge nickel metal surface. The optimal Cr/Ni ratio and palladium content are 2% and 0.6 mg/cm/sup 2/, respectively. The catalytic activity of the new catalyst is about ten times more than presently available metallic catalysts.