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A nuclear meltdown (core meltdown, core melt accident, meltdown or partial core melt [2]) is a severe nuclear reactor accident that results in core damage from overheating. The term nuclear meltdown is not officially defined by the International Atomic Energy Agency [3] or by the United States Nuclear Regulatory Commission. [4]
There was also a partial meltdown at the Enrico Fermi Nuclear Generating Station in Michigan in 1966. [5] The large size of nuclear reactors ordered during the late 1960s raised new safety questions and created fears of a severe reactor accident that would send large quantities of radiation into the environment.
The Three Mile Island accident was a partial nuclear meltdown of the Unit 2 reactor ... This reaction melted the nuclear fuel rod cladding and damaged the fuel ...
About 880 tons of highly radioactive melted nuclear fuel remains inside the three damaged reactors, but no one knows what condition the melted fuel is in or exactly where in the reactors it fell.
A nuclear meltdown is a severe nuclear reactor accident that results in reactor core damage from overheating. It has been defined as the accidental melting of the core of a nuclear reactor, and refers to the core's either complete or partial collapse.
Nuclear experts have warned of the risk of damage to the plant's spent nuclear fuel pools or its reactors. Cuts in power needed to cool the pools could cause a disastrous meltdown.
Nuclear power accidents in Germany [7] [33] Date Location Description Fatalities Cost (in millions 2006 US$ million) INES 1975: Greifswald, East Germany: A near core meltdown at Greifswald Nuclear Power Plant: Three out of six cooling water pumps were switched off for a failed test. A fourth pump broke down by loss of electric power and control ...
Due to decay heat, solid fuel power reactors need high flows of coolant after a fission shutdown for a considerable time to prevent fuel cladding damage, or in the worst case, a full core meltdown. In nuclear reactor operation, most heat is generated by nuclear fission, but over 6% comes from radioactive decay heat, which continues after the ...