Patent ID: 7813465

Claim:
A pressure suppression and decontamination apparatus for a reactor container including a dry well space having an upper dry well and a lower dry well, the reactor container housing therein a reactor pressure vessel containing nuclear core fuel, said apparatus comprising: a dry well cooling unit configured to cool a gas in the dry well space and produce a condensate of the gas; a circulation device configured to circulate the gas in the dry well space through said dry well cooling unit; a sprayer head connected to an outlet of a pump, disposed in the upper dry well, and configured to cool the reactor container; a drain pipe extending from said dry well cooling unit to the lower dry well, said drain pipe being configured to discharge the condensate from said dry well cooling unit, the drain pipe being directly connected to a changeover device, the changeover device being directly connected to the cooling unit; and a sprinkling device connected to said drain pipe and configured to sprinkle condensate in the dry well space, the sprinkling device being disposed lower than the dry well cooling unit and connected to receive condensate from the cooling unit via the drain pipe.