Nuclear meltdown

Three of the reactors at Fukushima I overheated because the cooling systems were broken because of a tsunami flooding the power station, causing core meltdowns. This was compounded by hydrogen gas explosions and the venting of contaminated steam which released large amounts of radioactive material into the air.[1]

Three Mile Island Nuclear Generating Station consisted of two pressurized water reactors manufactured by Babcock & Wilcox, each inside its own containment building and connected cooling towers. Unit 2, which suffered a partial core melt, is in the background.

The Three Mile Island reactor 2 after the meltdown.
Inlet 2BInlet 1ACavityLoose core debrisCrustPreviously molten materialLower plenum debrisPossible region depleted in uraniumAblated incore instrument guideHole in baffle plateCoating of previously-molten material on bypass region interior surfacesUpper grid damage

SL-1 core damage after a nuclear excursion.

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.

单词	Reactor meltdown
释义	Reactor meltdown 英语百科 Nuclear meltdown 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.
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Reactor meltdown

Nuclear meltdown