An situation when the temperature inside reactor core reaches such high levels that the fuel rods (made from Uranium) begin to melt their way down and destroy the reactor.
It usually happens when fuel rods cannot be cooled by a cold substance (for example heavy water) and they start vaporising every single molecule of water nearby, thus accelerating the process of building heat. The only thing operators can do now to stop it is to drop control rods, but it can be impossible because of built up pressure (that's how Chernobyl happened). When the control rods are down, the nuclear power plant crew still needs to resume water delivery to the reactor because of nuclear decay
TL:DR Nuclear fuel gets hot and burn it's way down the reactor.
It usually happens when fuel rods cannot be cooled by a cold substance (for example heavy water) and they start vaporising every single molecule of water nearby, thus accelerating the process of building heat. The only thing operators can do now to stop it is to drop control rods, but it can be impossible because of built up pressure (that's how Chernobyl happened). When the control rods are down, the nuclear power plant crew still needs to resume water delivery to the reactor because of nuclear decay
TL:DR Nuclear fuel gets hot and burn it's way down the reactor.
Guy from Fukushima: The tsunami shut down our water pumps and now now the heat level is over the critical point. We have to evacuate whole wing of power plant and get fireman over here. Tell them there's high risk of Nuclear meltdown.
by Tomsow(12) January 28, 2020
Get the Nuclear meltdownmug. QS Energy Research Facility had a meltdown 23 hours ago, 60 survivors were reported, 30 dead. We need to take them to the nearest hospital
by Mrnotflimflam March 7, 2021
Get the Meltdownmug. by Jewwy January 16, 2024
Get the Marini Meltdownmug. Similar to a Shibuya Meltdown, the Arkansas Meltdown consists of a person drinking a hefty amount of boxed red wine and throwing up all over the floors and walls of their house. This would create the affect of “painting” the walls red.
Oliver - “yo Chase, how do you feel after that Arkansas Meltdown last night?”
Chase - “I’m never drinking red wine again”
Chase - “I’m never drinking red wine again”
by ThatsOK01 August 4, 2024
Get the Arkansas Meltdownmug. Yasmin Cordero, while what can appear as an unimportant side character, actually served a very important part of the movie's plot. When Sid the Sloth went through his emotional breakdown on the iceberg midway through the film, Yasmin Cordero stood in the back, and smiled at Sid, which encouraged Sid to keep going. Yasmin Cordero's kind spirit is what allowed the hero of the movie to fight through his emotional breakdown.
by outrageousrickyxoxo September 3, 2024
Get the Yasmin Cordero (Ice Age 2: The Meltdown)mug. A metaphor to describe a woman having a fit or episode of absolute madness, irrationality or insanity
by squashhole September 19, 2016
Get the Vagina meltdownmug. by Fuckout March 11, 2019
Get the Meltdownmug.