ABS>Progress in nuclear safety research and development is reported. Topics covered include: reactivity effects of small fuel displacements in a pool- type reactor; studies in nuclear safety of fuels outside reactors; release of fission products from out-of-pile reactor fuels; release of fission products in in-pile melting or burning of reactor fuels; characterization and control of accident-released fission products; fission-product evaluation; I/sub 2/ removal from oxidizing gases at high temperatures; attenuation of fissionproduct escape by intrinsic processes; nuclear safety pilot plant; nuclear safety information center; radiochemicalplant safety studies; and space safety. (J.R.D.)