Evaluation of wastage by liquid impingement droplet erosion in steam generator of sodium-cooled fast reactor

Arae, Kunihiko*; Yoshida, Atsuro*; William, K.*; Narabayashi, Tadashi*; Ohshima, Hiroyuki; Kurihara, Akikazu 

In a Sodium-cooled Fast Reactor (SFR), liquid sodium is used as heat transfer fluid to carry the energy from the reactor core to the steam generator (SG). In case of a SG tube failure, a defect occurring on a heat transfer tube will cause the high-pressure and high-velocity water steam to spout onto the low-pressure liquid sodium filling in the space around the tube, to initiate sodium-water reaction. The steam outflow (water, sodium and sodium hydroxide) of the reaction would impinge on neighboring tube to cause erosion/corrosion, which might lead to a secondary failure. In this study, relations between several parameters and erosion rate of Mod.9Cr-1Mo in anticipated sodium-water reaction conditions were evaluated.