FIELD: nuclear power plants; in an emergency in case of loss of heat-transfer agent through walls. SUBSTANCE: system is provided with additional control device. Exhaust and loading air is supplied through additional shut-off valves. Loading air branch pipe is provided with additional valves and reservoir for storage of air which is fitted with shut-off valves on side of air supply. EFFECT: avoidance of contamination of secondary steam loop and water supply system; low danger of discharge of radioactive fluid into atmosphere. 2 dwg
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