Fukushima Daiichi nuclear disaster (Unit 3 Reactor) 13 March an official of the Japan Nuclear and Industrial Safety Agency (NISA) told at a news conference that the emergency cooling system of Unit 3 had failed, spurring an urgent search for a means to supply cooling water to the reactor vessel to prevent a meltdown of its reactor core. At 05:38 there was no means of adding coolant to the reactor, owing to loss of power. Work to restore power and to vent excessive pressure continued. At one point, the top three meters of the uranium/mixed oxide (MOX) fuel rods were not covered by coolant. At 07:30 JST,
Jōyō (nuclear reactor) Jōyō (nuclear reactor) It was made with the purpose of doing tests on and advancing the development of that type of reactor, as an irradiation test facility for construction materials. It also does tests with the nuclear fuel as well as activation experiments. The reactor has gone through 3 different core changes. The current core provides the neutron flux of 4×10 cms for E>0.1 MeV. After an incident in 2007, the reactor is suspended for repairing, recovery works were planned to be completed in 2014. Following the closure of the unsuccessful follow-on fast breeder reactor Monju in 2016, a decision