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.)

Modifications of EBWR are described, and data from analysis of control- rod operational crud deposit are tabulated. Development and construction progress on Borax V are summarized. Research for ZPR III is reported on a series of uranium oxide critical cores. Comparative data on composition, critical masses, and central fission ratios are tabulated for these assemblies. Developmental work on ZPR-VI, ZPR-IX, and Juggernaut is summarized, followed by a summary of EBR-I operation and development of EBR-II. Studies of reactor steam superheating concepts are reported from which conclusions are listed. In reactor safety studies, data were obtained on the extent of water reaction with various metal combinations for use in cores as function of energy input. In other work in-pile melt down studies were conducted. Operation and development of TREAT are described. Nuclear technological developments are summarized in sections on physics, fuel development, reactor components and materials, separations development, and advanced reactor development. (For preceding period see ANL- 6295.) (J.R.D.)

Developmental activities are reported on Borax-V, EBR-I, EBR-II, FARET, general reactor technology, and advanced reactor research. Other work is reported on the Pu recycle program and nuclear safety. (J.R.D.)

Research and development activities are reported on Borax V, ZPR- III, - VI, and -IX, EBR-I, EBR- II, and FARET. Reactor technology investigations are reported in reactor physics, reactor fuel development, viewing systems, heat engineering, and chemical separations. Research on advanced systems is reported on reactors and undersea nuclear power applications. Nuclear safety development in thermal and fast reactors is also reported. (J.R.D.)