Estimation of heat transfer coefficient and flow characteristics on heat transfer tube in sodium water reaction

Matsumoto, Toshinori*; Takata, Takashi*; Yamaguchi, Akira*; Kurihara, Akikazu ; Ohshima, Hiroyuki

In a steam generator of sodium-cooled fast reactor, high temperature reacting jet is generated when a heat transfer tube fails and it might cause a secondary fauilure of neighboring tubes due to tube deterioration. Quantification of heat transfer from fluid to the tube is important perspective of safety evaluation. In this study, the heat transfer coefficient on the heat transfer tube under sodium-water reaction phenomena was numerically estimated based on the temperature measured in a sodium experiment using SWAT-1R test facility of JAEA. Furthermore, the floa characteristics on the heat transfer tube was investigated taking into account the variation of the heat transfer coefficient.