Reactivity suppression of liquid sodium by suspended nanoparticles

ナノ粒子分散による液体ナトリウムの反応抑制

斉藤 淳一  ; 永井 桂一 ; 荒 邦章 

Saito, Junichi; Nagai, Keiichi; Ara, Kuniaki

Liquid sodium is used as coolant of the fast breeder reactor, because it has many superior heat transfer properties. However, its high reaction activity with water or oxygen is a shortage. A reaction suppression technology has been developed using nanoparticles suspension in liquid sodium. An atomic interaction between nanoparticles and sodium atoms is used in this idea. There is a corrosion property as one of important properties of the liquid sodium coolant. In the special condition such as elevated temperature and high humidity, high speed corrosion which called the molten salt corrosion occurs. From the experimental results the corrosion rate of sodium with suspended nanoparticles decreased remarkably compared with sodium. The decrease of corrosion rate is caused by the bond between nanoparticles and an ionized oxygen.