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The second was a criticality accident at a separate fuel reprocessing facility belonging to Japan Nuclear Fuel Conversion Co. (JCO) on 30 September 1999 due to improper handling of liquid uranium fuel for an experimental reactor. [1]
A criticality accident is an accidental uncontrolled nuclear fission chain reaction. ... ten in the Soviet Union, two in Japan, one in Argentina, and one in ...
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.
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.
Tokaimura, Japan: The criticality accident at the Tokai fuel fabrication facility. [42] Hundreds of people were exposed to radiation and two workers later died. This is not a nuclear power plant accident, however. [46] 2: 4 2002: Onagawa, Japan: Two workers were exposed to a small amount of radiation and suffered minor burns during a fire. [46 ...
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 ...
TEPCO claimed that there was a small but non-zero probability that the exposed fuel assemblies in the Unit 4 reactor could reach criticality. [45] [46] The BBC commented that criticality would never mean a nuclear explosion, but could cause a sustained release of radioactive materials. [45]
Buenos Aires – 1983, criticality accident on research reactor RA-2 during fuel rod rearrangement killed one operator and injured two others. Tokaimura nuclear accident (Japan) – 1999, three inexperienced operators at a reprocessing facility caused a criticality accident ; two of them died.