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A criticality accident occurred on December 30, 1958, at Los Alamos National Laboratory (LANL) in Los Alamos, New Mexico, in the United States It is one of 60 known criticality events that have occurred globally outside the controlled conditions of a nuclear reactor or test; though it was the third such event that took place in 1958 after events on June 16 [1] at the Y-12 Plant in Oak Ridge ...
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 ...
Due to a procedural error, the mixture contained 3.27 kg of plutonium, which reached criticality for about 200 microseconds. Kelley received 3,900 to 4,900 rad (36.385 to 45.715 Sv) according to later estimates. The other operators reported seeing a bright flash of blue light and found Kelley outside, saying "I'm burning up! I'm burning up!"
1961 Goldsboro B-52 crash; K. Cecil Kelley criticality accident; P. President's Commission on the Accident at Three Mile Island; Project 4.1; R.
15 October 1958: Vinča, Yugoslavia. There was a criticality incident in a newly installed reactor. Six young researchers received high doses of radiation, and were subsequently treated at "Kiri" institute in Paris where one of them died. [citation needed] 30 December 1958: Cecil Kelley criticality accident at Los Alamos National Laboratory ...
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January 17, 1966 – 1966 Palomares B-52 crash. [18] December 1990 ... Cecil Kelley criticality accident, at the Los Alamos National Laboratory. [27] 1961 – ...
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 ...