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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 ...
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.
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.
To prevent any possible nuclear criticality, TEPCO planned to dump boric acid into the reactor and to increase the volume of cooling water by 3 tons per hour. [ 55 ] Since only one of the temperature-sensors showed fluctuating readings between 70 °C and 90 °C, TEPCO and NISA thought this sensor was malfunctioning.
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.
Japan has committed to becoming carbon-neutral by 2050, but the legacy of the 2011 Fukushima nuclear catastrophe makes that goal harder to reach. Japan wants to cut carbon. But one of the world's ...
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 ...
September 1999: two fatalities at criticality accident at Tokaimura nuclear accident (Japan) 2000s. January–February 2000: Samut Prakan radiation accident: three deaths and ten injuries resulted in Samut Prakan when a cobalt-60 radiation-therapy unit was dismantled. [19] May 2000: Meet Halfa, Egypt; two fatalities due to radiography accident ...