[en] This report of the Centre d'Etude de l'Energie Nucleaire - Studiecentrum voor Kernenergie gives a survey of the scientific and technical work done in 1977. The research areas are: 1. The sodium cooled fast reactors and namely the mixed oxide fuels, the carbide fuel, the materials development, the reprocessing, the fast reactor physics, the safety and instrumentation and the sodium technology. 2. The gas cooled reactors as gas cooled fast and high temperature reactors. 3. The light water reactors namely the BR3 reactor, the light water reactor fuels and the plutonium recycling. 4. The applied nuclear research, waste conditioning and disposal as the safeguards, the fusion research and the lithium technology. 5. The basic and exploraty research namely the materials science and the nuclear physics and finally 6. Non-nuclear reseach and development such as the air pollution, the pollution abatement and waste handling, the fuel cells and applied electrochemistry. (AF)