[en] In the years 1981 to 1985 five Czechoslovak institutions were involved in the research and development project dealing with the disposal of radioactive wastes from nuclear power plants with WWER reactors. The main institution involved was the Nuclear Research Institute. The project had four main goals: to restrict production of liquid radioactive wastes, to conclude the development of procedures and installations for the bituminization of liquid wastes including equipment for the transportation and storage of bituminization products, to complete the development of procedures and installations for processing solid wastes by incineration and compacting, and to develop new procedures of radioactive waste processing. As against initial intents, the results could not be verified in any experimental incineration and bituminization facility because the planned facility at the V-2 nuclear power plant at Jaslovske Bohunice has so far not been constructed. All other objectives have been reached including a substitute project for radioactive waste disposal at Jaslovske Bohunice. Another experimental bituminization line was put into operation with a capacity of 0.1 m³/h and the development of cementation of calcined radioactive wastes has been speeded up - industrial implementation of the project was not envisaged in the original plans. Also built was a mobile calcination and cementation line with a capacity of 0.6 m³/h in the cementation of concentrates and 0.1 m³/h in the cementation of calcinates. Czechoslovakia is now able to offer the respective technologies and facilities also for export. (Z.M.)