Welcome to Monju website

Fast Reactors (FRs) and related fuel cycle provide sustainable energy to humans for thousands years. Monju is the development core of the FR technology in Japan and is contributing to the world as well. Monju restarted its System Start-up Tests (SSTs) on May 6, 2010 following 14 year 5 month suspension after the sodium leak event occurred in 1995. JAEA propels the SSTs and succeeding full power operation steadily and safely targeting to complete the original missions of Monju: demonstrating reliability as power plant and establishing sodium handling technology.