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Report No.

Investigation of flow optimization in a compact reactor vessel of a FBR; Survey of flow optimization devices shape

Sato, Hiroyuki; Igarashi, Minoru; Kimura, Nobuyuki; Kamide, Hideki 

Gas entrainment due to high flow velocity in the UIS slit is one of major point of reactor vessel design. A 1/20th scaled model water experiment for a reactor vessel upper plenum was performed to evaluate flow through a slit in the column type UIS, fundamental behavior of reactor upper plenum flow, and survey some devices which reduce flow velocity through the slit and optimize flow in the plenum.The results are as follows. The outer shroud had effects to bend the jet through the UIS slit toward the reactor vessel wall and also to flatten flow exiting from the UIS. And flow guide was set beside of the slit of UIS baffle plate to reduce the jet velocity in the UIS slit using Coanada effect, the maximum effect was seen by using around shape guide.



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