The Research Centre Řež is a research organisation concentrating on research, development and innovation in the energy sector, primarily nuclear. The company operates a major research infrastructure to support R&D for development of nuclear and other means of sustainable power generation. In particular, the two research reactors, create the core of the infrastructure and are linked to technological loops, hot cells, laboratories for material science, severe accident modelling, technologies for testing components and materials for fusion related R&D. This covers most of the life cycle of current technologies of GEN II–III+, future GEN IV and fusion technologies.