FIELD: producing deactivating gases for nuclear power and other industries. SUBSTANCE: for producing deactivating gas to be introduced in vessel such as containment 3 of nuclear power plant, inert gas 1 in liquid or solid state is stored in first storage tank 4; second storage tank 5 is used to store heat accumulated in coolant 2 in amount sufficient for evaporating gas 1. Then coolant 2 is brought in contact with liquefied or solidified inert gas. Device for producing deactivating gas is given in description of invention. EFFECT: enlarged quantity of deactivating gas produced for deactivating nuclear power plant containment. 19 cl, 6 dwg
