BOILING WATER REACTOR

PROBLEM TO BE SOLVED: To prevent feed water from containing noncondensable gases in large quantity to thereby increase the latent heat per unit weight in a reactor core during boiling of water, with improved thermal efficiency. SOLUTION: In a boiling water reactor, steam generated in a reactor pressure vessel is fed to a steam turbine through main steam system piping, the steam subjected to the work there is condensed by a steam condenser, and the condensed water is fed to a feed water system through a heater and a deaerator by a condensate pump to thereby be circulated as nuclear reactor water to the reactor pressure vessel through the feed water system. The steam condenser 206 has therein heat transfer tubes to which cooling water is fed from a cooling water system, and a plate disposed below the heat transfer tubes. A perforated plate 101 having a plurality of holes at a plate face thereof for receiving the condensed water subjected to heat exchange by the heat transfer tubes and streaming down from the plate is horizontally disposed nearly above a liquid level of a condensate sump or just below the liquid level of the condensate sump. COPYRIGHT: (C)2008,JPO&INPIT