Cavitation tests on flow control devices for JOYO advanced core

not registered; not registered; not registered; Oki, Yoshihisa*

Pressure drop characteristics and possible cavitation occurrence have been investigated on the Joyo receptacles and nosepieces as part of the Joyo Advanced Core Study. The occurrence of cavitation is of particular important on the part of non-replaceable components. Thus, visual observation was made with particular emphasis on cavitation on the receptacle side. Fixed-type of cavitation has been observed on the receptacle wall of Zone-5. In order to suppress this type of cavitation, flow testing has been made using a nosepiece with a large orifice diameter on the second stage. For this case, no cavitation has been observed on the receptacle wall, thereby demonstrating one possible cure for cavitation on the Zone-5 receptacle.