[en] Hyperfiltration (HF) testing was conducted at TVA's Sequoyah Nuclear Plant to determine the effectiveness of this method in cleaning and processing radioactive liquid streams. Preconcentration of condensate demineralizer regeneration waste solutions by HF has shown that acceptable volume reduction factors, rejection rates, and membrane useful life can be obtained while processing in situ nuclear plant waste streams. The test unit was manufactured by and purchased from Carre, Inc., of Seneca, South Carolina, with consultation on certain design parameters by the TVA project engineer and lead technical engineer. This project has provided enough beneficial information to allow design specification work on a large permanent HF unit which will be installed permanently in the plant. Ongoing tests include filtration studies on floor and tritiated drain wastes and on contaminated waste oil currently stored in 55-gallon steel drums