[en] In order to protect the public, environment and workers from the radiation hazards, nuclear power plants are equipped with the barriers that limit the spreading of the radioactive material. The last barrier, which prevents the radioactive material from release into the environment, is the containment or confinement, which encloses the piping of the reactor cooling system and the reactor itself. The Accident Localisation System and the Reactor Cavity which employs the pressure suppression principle perform a function of containment at the Ignalina NPP with an RBMK-1500 reactor. The paper presents a review of the containment / confinement types available around the world, discusses their main features, presents the processes that occur in the containments / confinements and compares the key parameters of the Ignalina NPP Accident Localisation System with other containments / confinements. (author)