| 摘要 |
PURPOSE:To sufficiently heighten the oscillation rigidity of a drain channel by dividing and providing a plural drain pipe and channel which correspond a drain pipe to a drain channel. CONSTITUTION:A drain channel 2 is divided into 12 channels and connected so as to correspond a drain pipe 5 to a drain channel 2. Thus, drain is surely treated and drain performance can be secured because the drain is returned in reactor water. On the other hand, since the drain channel 2 is miniaturized, the natural frequency indicates 60Hz or more and so the drain channel 2 is high rigid, vibration response produced by steam flow fluctuation can considerably be reduced and soundness against oscillation can be secured. As a result of estimation by the aid of oscillation stress analysis, the oscillation stress of 12 divided drain channels is reduced 1/20 in comparison with 4 divided drain channels.
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