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  2. Criticality accident - Wikipedia

    en.wikipedia.org/wiki/Criticality_accident

    A criticality accident occurs if the same reaction is achieved unintentionally, for example in an unsafe environment or during reactor maintenance. Though dangerous and frequently lethal to humans within the immediate area, the critical mass formed would not be capable of producing a massive nuclear explosion of the type that fission bombs are ...

  3. Lists of nuclear disasters and radioactive incidents - Wikipedia

    en.wikipedia.org/wiki/Lists_of_nuclear_disasters...

    1993 Tomsk-7 accident at the Reprocessing Complex in Seversk, Russia, when a tank exploded while being cleaned with nitric acid. The explosion released a cloud of radioactive gas (INES level 4). The explosion released a cloud of radioactive gas (INES level 4).

  4. Nuclear and radiation accidents and incidents - Wikipedia

    en.wikipedia.org/wiki/Nuclear_and_radiation...

    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.

  5. List of nuclear power accidents by country - Wikipedia

    en.wikipedia.org/wiki/List_of_nuclear_power...

    Globally, there have been at least 99 (civilian and military) recorded nuclear power plant accidents from 1952 to 2009 (defined as incidents that either resulted in the loss of human life or more than US$50,000 of property damage, the amount the US federal government uses to define nuclear energy accidents that must be reported), totaling US$20.5 billion in property damages.

  6. List of nuclear and radiation accidents by death toll - Wikipedia

    en.wikipedia.org/wiki/List_of_nuclear_and...

    The Windscale fire resulted when uranium metal fuel ignited inside plutonium production piles; surrounding dairy farms were contaminated. [33] [34] The severity of the incident was covered up at the time by the UK government, as Prime Minister Harold Macmillan feared that it would harm British nuclear relations with America, and so original reports on the disaster and its health impacts were ...

  7. List of military nuclear accidents - Wikipedia

    en.wikipedia.org/wiki/List_of_military_nuclear...

    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.

  8. Comparison of Chernobyl and other radioactivity releases

    en.wikipedia.org/wiki/Comparison_of_Chernobyl...

    The criticality accidents may be divided into two classes. For more details see nuclear and radiation accidents. A review of the topic was published in 2000, "A Review of Criticality Accidents" by Los Alamos National Laboratory (Report LA-13638), May 2000. Coverage includes United States, Russia, United Kingdom, and Japan.

  9. List of Japanese nuclear incidents - Wikipedia

    en.wikipedia.org/wiki/List_of_Japanese_nuclear...

    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.