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The Tokaimura nuclear accidents refer to two nuclear related incidents near the village of Tōkai, Ibaraki Prefecture, Japan. The first accident occurred on 11 March 1997, producing an explosion after an experimental batch of solidified nuclear waste caught fire at the Power Reactor and Nuclear Fuel Development Corporation (PNC) radioactive ...
At 20:05 JST on 12 March, the Japanese government ordered seawater to be injected into Unit 1 in a new effort to cool the reactor core. [60] The treatment had been held as a last resort since it ruins the reactor. [61] TEPCO started seawater cooling at 20:20, adding boric acid as a neutron absorber to prevent a criticality accident.
Accidental criticality Main article: Tokaimura nuclear accident During preparation of a uranyl nitrate solution, uranium in solution exceeded the critical mass , at a uranium reprocessing facility in Tokai-mura northeast of Tokyo, Japan.
The Chernobyl accident is not universally regarded an example of a criticality accident, because it occurred in an operating reactor at a power plant. The reactor was supposed to be in a controlled critical state, but control of the chain reaction was lost. The accident destroyed the reactor and left a large geographic area uninhabitable.
Criticality accidents are divided into one of two categories: Process accidents, where controls in place to prevent any criticality are breached;; Reactor accidents, which occur due to operator errors or other unintended events (e.g., during maintenance or fuel loading) in locations intended to achieve or approach criticality, such as nuclear power plants, nuclear reactors, and nuclear ...
The Air Force grounded a set of Osprey aircraft after one of the planes crashed in waters off of Japan earlier this week, killing one and leaving seven still missing, officials said Friday.
The video appears to show large amounts of debris contaminating the pool. Based on water samples analysed, unnamed experts and TEPCO reported that the fuel rods were left "largely undamaged", [ 51 ] [ 52 ] and that it appears that the Unit 3 explosion was entirely related to hydrogen buildup within the building from venting of the reactor.
Japanese actress Sei Ashina has died at age 36, her agency confirmed in a statement. Ashina was born in Fukushima in 1983. In 2007 she was cast as the Japanese lead in “Silk,” an arthouse ...