Tokaimura nuclear accident happened in 1997.
In 1999, there was a nuclear accident at the Tokaimura uranium processing facility in Japan, which exposed dozens of workers to high levels of radiation. This accident resulted from a criticality accident during the processing of nuclear fuel.
The term "Broken Arrow" is used to indicate a nuclear accident involving a nuclear weapon that does't pose the threat indicated. The term "excursion" (as in nuclear excursion) or "criticality accident" is applied to a nuclear reactor or nuclear material accident, respectively.
The Chernobyl nuclear accident.
Those most at risk in a nuclear energy accident are the workers at the nuclear facility itself.
Three major nuclear accidents; namely:Three Miles Islands nuclear accident, USA, March 1979Chernobyl nuclear accident, Ukraine (former Soviet Union), April 1986Fukushima nuclear accident, Japan, March 2011
Nuclear power accidents are a disaster. The 1986 nuclear accident at the Chernobyl Nuclear Power Plant in Ukraine was a catastrophic accident.
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An nuclear bomb is purposefully release to pulse out damage. A nuclear accident, on the other hand, is an accident when a nuclear source (usually referring to a nuclear plant) either blows up or leaks. Although it is normally weaker and less dangerous than a nuclear bomb, a big enough explosion or a serious enough nuclear meltdown can break that limit.
Carnage
Idiomatically, an accident waiting to happen is a situation which is almost certain to eventually lead to an accident.
The Chernobyl Nuclear Power Plant underwent a level 7 event - the worst accident so far. The plant, located in the Soviet Union near Pripyat in Ukraine lost its number four reactor on 26 April 1986. A link to the Wikipedia article on the accident is provided.
A number of nuclear submarines sank, and the circumstances vary from accident to accident. Wikipedia has a list, and by going there and entering "List of sunken nuclear submarines" you can review that list.