Passive heat removal from containment

Details Passive heat removal from containment Passive heat removal from containment

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G21C 15/02 (2006.01) G21C 15/18 (2006.01) G21C 1/08 (2006.01) G21C 9/004 (2006.01)

Patent

CA 2012244

24-AT-05050 ABSTRACT OF THE DISCLOSURE A suppression chamber in a nuclear reactor containment includes a heat exchanger disposed in a gas space above water in the suppression chamber. A gravity-driven pool contains a supply of make-up water that is gravity fed to the heat exchanger through a conventional level-maintaining valve such as a float valve. A top header in the heat exchanger includes a free surface area for permitting separation of steam from water, thereby permitting venting of vapor only, while retaining the liquid coolant in the heat exchanger. A downcomer tube permits return of excess water to a lower location for further use in the heat exchanger. The heat exchanger is normally sealed, whereby internal surfaces in the heat exchanger require only a small amount of low-volatility corrosion inhibitors to prevent corrosion on internal surfaces thereof. Locating the heat exchanger in the gas space in the suppression chamber reduces the amount of corrosion on its external surfaces. Condensate drips from the heat exchanger into the water below to disturb the water and thus enhance mixing and promote heat removal.

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