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3:04pm
Japanese nuclear authorities say there is a high possibility that nuclear fuel rods at a reactor at Tokyo Electric Power Company's (TEPC) Fukushima Daiichi plant may be melting or have melted, Jiji news agency reports.
Experts have said that if the fuel rods have been damaged, it means that it could develop into a breach of the nuclear reactor vessel and the question then becomes one of how strong the containment structure around the vessel is and whether it has been undermined by the earthquake – and if it can withstand the likely aftershocks.
PLEASE...Does anyone know what a full-blown melt-down means?????? What would happen?
source
The 'China Syndrome' refers to the most drastically severe meltdown a nuclear reactor could possibly achieve. In this case, the reactor would reach the highest level of supercriticality for a sustained period of time, resulting in the melting of its support infrastructure (meltdown). The uranium in the core would behave in a similar manner to a delta-class fire, self-sustaining temperatures in excess of 2000°C. Since these temperatures would melt all materials around it, the reactor would sink due to gravity, effectively boring a hole through the reactor compartment's floor...
The China syndrome becomes fictional in the hypothesis of it boring a hole from the United States to China, or any other part of the world
Most obviously it is impossible because the Earth's gravity would only pull it towards the core of the planet and no further. Furthermore, were the molten reactor fuel to reach the planetary mantle, the actual environmental effect would likely be low; the radioactive material would disperse by convection throughout the mantle, which is in any case kept liquid by natural nuclear decay. However, it is likely that the uranium core would not exceed more than 10 meters of 'boring' due to natural passive safety. The surrounding ground beneath the reactor would absorb the heat and transfer it conductivity to the surrounding area, thus preventing the ground directly beneath the core from 'melting'
Originally posted by SkepticOverlord
Not good...
Live blog: Japan earthquake
3:04pm
Japanese nuclear authorities say there is a high possibility that nuclear fuel rods at a reactor at Tokyo Electric Power Company's (TEPC) Fukushima Daiichi plant may be melting or have melted, Jiji news agency reports.
Experts have said that if the fuel rods have been damaged, it means that it could develop into a breach of the nuclear reactor vessel and the question then becomes one of how strong the containment structure around the vessel is and whether it has been undermined by the earthquake – and if it can withstand the likely aftershocks.
Just minutes ago.
TOKYO – Japan declared states of emergency for five nuclear reactors at two power plants after the units lost cooling ability in the aftermath of Friday's powerful earthquake. Thousands of residents were evacuated as workers struggled to get the reactors under control to prevent meltdowns. Operators at the Fukushima Daiichi plant's Unit 1 scrambled ferociously to tamp down heat and pressure inside the reactor after the 8.9 magnitude quake and the tsunami that followed cut off electricity to the site and disabled emergency generators, knocking out the main cooling system. An official with Japan's nuclear safety commission says that a meltdown at nuclear power plant affected by the country's massive earthquake is possible. Ryohei Shiomi said Saturday that officials were checking whether a meltdown had taken place at the Fukushima Dai-ichi power plant, which had lost cooling ability in the aftermath of Friday's powerful earthquake.
Originally posted by QueSeraSera
Back then, Chernobyl terrified me...the possibilities concerning this are just so much worse. Of course the media will attempt to corral panic, but in any event this is not a favorable development for life on this planet. I can only hope that this information in incomplete and overstated.
My gut reaction is that it's not. Peace to us all.
Originally posted by westcoast
Thank you. My next question then, is if it isn't strong enough and can't contain it, what happens? A nuclear detonation? Would this be the equivelant of an atom bomb?
Originally posted by westcoast
My next question then, is if it isn't strong enough and can't contain it, what happens?