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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]
Most commercial types of nuclear reactor use a pressure vessel to maintain pressure in the reactor plant. This is necessary in a pressurized water reactor to prevent boiling in the core, which could lead to a nuclear meltdown. This is also necessary in other types of reactor plants to prevent moderators from having uncontrolled properties.
A clean-up crew working to remove radioactive contamination after the Three Mile Island accident.. Nuclear safety is defined by the International Atomic Energy Agency (IAEA) as "The achievement of proper operating conditions, prevention of accidents or mitigation of accident consequences, resulting in protection of workers, the public and the environment from undue radiation hazards".
A reactor protection system is designed to immediately terminate the nuclear reaction. By breaking the nuclear chain reaction, the source of heat is eliminated. Other systems can then be used to remove decay heat from the core. All nuclear plants have some form of reactor protection system.
TEPCO finished removing all spent fuel rods from a cooling pool at No. 4 reactor in 2014 and from the No. 3 reactor pool in 2021. It plans to complete removal of the rods from the No. 1 and No. 2 ...
A core catcher is a device provided to catch the molten core material of a nuclear reactor in case of a nuclear meltdown and prevent it from escaping the containment building. A core catcher is made from a special thermally resistant concrete ceramic to prevent nuclear core material from melting through the core catcher; it also has a cooling ...
The plant supplies 6% of California's power, but carries a 1 in 37,000 chance of experiencing a Chernobyl-style nuclear meltdown within five years. Earthquake risks and rising costs: The price of ...
In Japan, during each fiscal year, a prefecture that has nuclear power stations in its territory is legally bound to hold nuclear accident disaster drills, demonstrating how to evacuate the population out of the 10-kilometer evacuation zone according to the governmental anti-disaster guidelines.