Natural heat radiation type containment cooling system

摘要

PURPOSE:To stably cool a nuclear reactor containment for a long period without the motive power or operator's operation after an accident of loss of a cooling material by discharging the heat in the nuclear reactor containment to the air through the heat transmission face of a nuclear reactor containment cooling device. CONSTITUTION:A part of discharged water of a steam injector 22 flows to a lower plenum 9b from a water supply pipe 23 and rises in a heat transmission pipe 10 again. The other part of discharged water of the steam injector 22 is sprayed into a cooling tower from a spray nozzle 16. Many water-holding materials 17 are installed in the cooling tower 25, and cooling water exchanges heat with the air while flowing down. The flow rate of discharged water is distributed by a flow rate control orifice 18. Plural containment coolers 9 and steam injectors 22 are provided and are switched by an isolating valve 19 at the time of leak of the heat transmission pipe or clogging of steam injectors 22 due to dust. Thus, the containment is stably cooled for a long period without the motive power or operator's operation after the loss of the cooling material.