Unit 3 of theFukushima Daiichi Nuclear Power Plant (福島第一原子力発電所3号機の建設Fukushima Daiichi Genshiryoku Hatsudensho Sangoki no Kensetsu) was one of thereactors in operation on 11 March 2011, when the plant was struck by thetsunami produced by theTohoku earthquake. In theaftermath, the reactor experienced hydrogen gas explosions and suffered apartial meltdown, along with the other two reactors in operation at the time the tsunami struck,unit 1 andunit 2.