Progress in nuclear safety research and development is reported. Topics covered include: reactivity effects of fuel displacements in a pool-type reactor, release of fission products on out-of-pile melting of reactor fuels, release of fission products on in-pile melting of reactor fuels, fission product transport evaluations, characterization and control of accident-released fission products, nuclear safety pilot plant, preparation of reactor containment hardbook, and radiochemical plant safety studies. (M.C.G.)

Progress on the nuclear safety research and development program is reported. Topics covered include: physics, chemistry, containment engineering, and radiochemical plants. Progress on the reactor containment handbook is estimated. Separate abstracts were prepared for each of the 8 papers. (M.C.G.)