Safety function — category of classification

The correct classification of systems and elements of technical devices plays very important role at their design, production and operation, allows making the differentiated requirements to various systems and elements, providing their functioning in the best way and achievement of the objectives for which technical devices were created.When forming requirements for safety of nuclear power plants in the Soviet Union in the late 60th — the beginning of the 70th there was a question of classification of systems and the elements, and contradictions together with it with the classification of IAEA existing then.