The submitted bachelor's thesis deals with the irreplaceable role of nuclear energy and the types of reactors being designed at the same time. A large part of the work is focused on a relevant overview of nuclear reactors in the world, including those under construction. The thesis deals with the legislation of the Czech Republic in the field of nuclear safety and international cooperation between operators of nuclear power plants. In the conclusion of the bachelor's thesis, the perspective of the future development of nuclear energy in our country and in the world is mentioned. The research-synthetic method was used for processing the text