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Report No.
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Analysis of temperature response characteristics for coolant around SASS sensitive alloy in demonstration FBR

Hagiwara, Hiroyuki*; Oyama, Kazuhiro*; Watanabe, Osamu*; Eto, Masao*; Yamano, Hidemasa   

Fast Reactor Cycle Technology Development Project (FaCT) adopts Self-Actuated Shutdown System (SASS). SASS is the system dropping the control rod to shutdown by sensing the core outlet temperature rise from Anticipated Transient Without Scram (ATWS) of abnormal transition. Hence, coolant flow velocity around the SASS sensing alloy improves temperature response time constant. Especially, accelerating the coolant flow velocity in the slit installed at the SASS sensing alloy. This study aims at flow acceleration and considers proposed structure of incorporating flow collector surrounding six SASS auxiliary assembly. The result of the effectiveness evaluation by three-dimensional thermal hydraulic analyses is presented.

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