Progress is reponted on the Aircraft Reactor Test (ART) design; ART physics; ART instruments and controls; component development and testing; ART, ETU, and in-pile loop operations; phase equilibrium studies; chemical reactions in molten salts; physical properties of molten materials; production of fuels; compatibility of materials at high temperatures; analytical chemistry; dynamiccorrosion studies; general-corrosion studies; fabrication research; wedling and brazing investigations; mechanicalproperties studies; ceramic research; nondestructivetesting studies; heat transfer and physical properties; radiation damage; fuel recovery and processing; and critical experiments. (W.L.H.)