Development of experiment method due to high-temperature sodium hydroxide impinging

Umeda, Ryota ; Shimoyama, Kazuhito ; Kurihara, Akikazu 

In case of the water leak into sodium in a steam generator (SG) of sodium-cooled fast breeder reactors (FBRs), exothermic reaction produces reaction fields in association with high temperature and high corrosive action (sodium-water reaction). Adjacent tubes are damaged due to erosive and corrosive environment of the reaction field. Therefore, it is integral to evaluate such sodium-water reaction phenomena with high accuracy for the safety assessment of FBRs. For the purpose of understanding the wastage mechanism, we developed the new experimental apparatus and established the test procedure in which sodium hydroxide (NaOH) collided with the tube material under high temperature conditions simulating the reaction field.