| 摘要 |
PROBLEM TO BE SOLVED: To efficiently absorb non-condensible gas and reduce the concentration of dissolved oxygen by lowering the level of the non-condensible gas such as dissolved oxygen with a water supply system of a boiling water reactor. SOLUTION: In a boiling water reactor in which steam generated in a reactor pressure vessel is sent through a main steam line to a steam turbine and the steam supplied for work is condensed in a condenser into water which is sent with a condensate pump through a heater and a deaerator to a feed water system and returned as reactor feed water through the feed water system into the reactor pressure vessel, a low pressure drain tank 213 for introducing part of steam/water heated with a heater through a steam/water inlet piping 1, extracting non-condensible gas such as oxygen contained in the steam/water and sucking in an offgas extractor 216 is provided and the steam/water inlet piping 1 is penetrated through a tank wall into the low pressure drain tank 213. Around the piping 1 positioned in the tank, a plurality of flow holes 4 for discharging steam/water as droplets are provided with proper intervals.
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