Research and development activities are reported on Borax-V, ZPR-III No. 44, ZPR-VI No. 1, ZPR-IX, EBR-I, EBR-II, EBWR, Treat, Faret, Rapsodie Reactor, critical assemblies, fast reactors, Argonne Low Power Research Reactor, Topsy, Godiva, Argonaut Reactor, Argonne Advanced Research Reactor, Rocket Fuel Test Reactor, magnetohydrodynamic cells, and fuel cells. Reactor technology and investigations are reported in reactor physics, fuels and materials development, component development, heat engineering, and chemical separations. Nuclear safety development in thermal and fast reactors is discussed. (N.W.R.)

Development progress is reported on fast reactors, liquid metal cooled reactors, ZPR-III No. 22 and 44, Z PR-VI No. 1, ZPR-IX, Borax-V, Faret, EBR-I, EBR-II, treat, Fermi Fast Breeder Reactor, critical assemblies, Argonne Advanced Research Reactor, EBWR, magnetohydrodynamic cells, thermionic cells, fuel cells, and boiling water reactors. Reactor technology is reported on fuel development, physics, heat and fluid engineering, materials development and properties, chemical separations, nuclear safety, and corrosion testing. (N.W.R.)