Flow diagram of the containment cooling and ventilation system: 1 - recirculating system for cooling the unattended area; 2 - recirculating system for purifying air inside the containment rooms; 3 - recirculating system for cooling the control and protection system drives; 4.1 - recirculating system for cooling the annulus area, adjacent rooms and equipment they accommodate; 4.2 - recirculating system for cooling the containment central hall; 5 - exhaust ventilation system; 6 - plenum ventilation system.