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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 ...
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.
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 ...
A sketch of Louis Slotin's criticality accident used to determine exposure of those in the room at the time. While demonstrating his technique to visiting scientists at Los Alamos, Canadian physicist Louis Slotin manually assembled a critical mass of plutonium. A momentary slip of a screwdriver caused a prompt critical reaction.
Japan Nuclear and Industrial Safety Agency (NISA) reiterated concerns about a Unit 3 breach on 30 March. [54] NHK World reported the NISA's concerns as "air may be leaking", very probably through "weakened valves, pipes and openings under the reactors where the control rods are inserted", but that "there is no indication of large cracks or ...
1966 Palomares B-52 crash 1964 SNAP 9a satellite releases plutonium over the planet earth, an estimated 630 TBq or 2100 person-Sv [ citation needed ] of radiation was released. 1962 Thor missile launch failures during nuclear weapons testing at Johnston Atoll under Operation Fishbowl
On 12 May, TEPCO engineers confirmed that a meltdown occurred, with molten fuel having fallen to the bottom of the reactor's pressure vessel, or RPV. [40] The utility said that fuel rods of the No. 1 reactor are fully exposed, with the water level 1 meter (3.3 feet) below the base of the fuel assembly.