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- Nuclear_meltdown abstract "A nuclear meltdown is an informal term for a severe nuclear reactor accident that results in core damage from overheating. The term is not officially defined by the International Atomic Energy Agency or by the Nuclear Regulatory Commission. However, it has been defined to mean the accidental melting of the core of a nuclear reactor, and is in common usage a reference to the core's either complete or partial collapse. \"Core melt accident\" and \"partial core melt\" are the analogous technical terms for a meltdown.A core melt accident occurs when the heat generated by a nuclear reactor exceeds the heat removed by the cooling systems to the point where at least one nuclear fuel element exceeds its melting point. This differs from a fuel element failure, which is not caused by high temperatures. A meltdown may be caused by a loss of coolant, loss of coolant pressure, or low coolant flow rate or be the result of a criticality excursion in which the reactor is operated at a power level that exceeds its design limits. Alternately, in a reactor plant such as the RBMK-1000, an external fire may endanger the core, leading to a meltdown.Once the fuel elements of a reactor begin to melt, the fuel cladding has been breached, and the nuclear fuel (such as uranium, plutonium, or thorium) and fission products (such as cesium-137, krypton-85, or iodine-131) within the fuel elements can leach out into the coolant. Subsequent failures can permit these radioisotopes to breach further layers of containment. Superheated steam and hot metal inside the core can lead to fuel-coolant interactions, hydrogen explosions, or water hammer, any of which could destroy parts of the containment. A meltdown is considered very serious because of the potential for radioactive materials to breach all containment and escape (or be released) into the environment, resulting in radioactive contamination and fallout, and potentially leading to radiation poisoning of people and animals nearby.".
- Nuclear_meltdown thumbnail Fukushima_I_by_Digital_Globe.jpg?width=300.
- Nuclear_meltdown wikiPageExternalLink feature-world-worst-nuclear-power-disasters-chernobyl.
- Nuclear_meltdown wikiPageExternalLink Nuclear+Accidents+-+Civilian.
- Nuclear_meltdown wikiPageExternalLink part-melt.htm.
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- Nuclear_meltdown wikiPageWikiLink 2011_Tōhoku_earthquake_and_tsunami.
- Nuclear_meltdown wikiPageWikiLink AP1000.
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- Nuclear_meltdown wikiPageWikiLink Acute_radiation_syndrome.
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- Nuclear_meltdown wikiPageWikiLink American_Nuclear_Society.
- Nuclear_meltdown wikiPageWikiLink Antipodes.
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- Nuclear_meltdown wikiPageWikiLink BORAX_experiments.
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- Nuclear_meltdown wikiPageWikiLink Category:Civilian_nuclear_power_accidents.
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- Nuclear_meltdown wikiPageWikiLink Comparison_of_Chernobyl_and_other_radioactivity_releases.
- Nuclear_meltdown wikiPageWikiLink Containment_building.
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- Nuclear_meltdown wikiPageWikiLink Convection.
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- Nuclear_meltdown wikiPageWikiLink Corium_(nuclear_reactor).
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- Nuclear_meltdown wikiPageWikiLink Crust_(geology).
- Nuclear_meltdown wikiPageWikiLink Czechoslovakia.
- Nuclear_meltdown wikiPageWikiLink Decay_heat.
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- Nuclear_meltdown wikiPageWikiLink HTR-10.
- Nuclear_meltdown wikiPageWikiLink HTTR.
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- Nuclear_meltdown wikiPageWikiLink Idaho_National_Laboratory.
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- Nuclear_meltdown wikiPageWikiLink Inert_gas.
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- Nuclear_meltdown wikiPageWikiLink International_Atomic_Energy_Agency.
- Nuclear_meltdown wikiPageWikiLink International_Nuclear_Event_Scale.
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- Nuclear_meltdown wikiPageWikiLink KS_150.
- Nuclear_meltdown wikiPageWikiLink Kilometre.
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- Nuclear_meltdown wikiPageWikiLink Light-water_reactor.
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- Nuclear_meltdown wikiPageWikiLink List_of_civilian_nuclear_accidents.
- Nuclear_meltdown wikiPageWikiLink Lists_of_nuclear_disasters_and_radioactive_incidents.
- Nuclear_meltdown wikiPageWikiLink Loss-of-coolant_accident.
- Nuclear_meltdown wikiPageWikiLink Loss-of-pressure-control_accident.
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- Nuclear_meltdown wikiPageWikiLink MKER.
- Nuclear_meltdown wikiPageWikiLink Magnox.
- Nuclear_meltdown wikiPageWikiLink Manhattan_Project.
- Nuclear_meltdown wikiPageWikiLink Mantle_(geology).