[en] Major scientific, technical and partly also economic results are reported achieved in 1986 by the Institute of Nuclear Research. The research and development efforts were mainly focused on applied research in nuclear power, namely, nuclear safety of the reactor core and fuel elements, neutron processes in the LR-0 reactor, radiation resistance of reactor materials, experimental and computer-aided research in reactor technology, fuel cycle chemistry (coolant and radioactive waste treatment, radioactive waste solidification, fuel reprocessing). In the sphere of ionizing radiation, work was concentrated on radiation resistance of plastics, radiation sterilization, radiation food treatment, radiopharmaceuticals production, applications of neutron activation analysis, neutron radiography, and radiation safety. The science management work consisted in coordination of the solution of science and technology development projects, and in international cooperation. The sphere of production and services covered the production of radiopharmaceuticals, semiconductor detectors of ionizing radiation, services provided by the Central Inspection Laboratory, irradiations services, data processing and information services. The social program of the Institute was aimed at improving the qualifications of the personnel, care of their housing, catering, working environment and recreation. (J.B.)