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Earthquake in Japan


Guest greenfairy43

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See: Haiti

As for building nuclear reactors on earthquake plates - the whole of japan is on, or near, an earthquake plate - theres 7 nuclear plants in Japan IIRC.I reckon you'd find that the reality of not having nuclear power in Japan would persuade most that it's worth the risk (and its worth saying, it has been alright up until now, and even now the authorities are saying the reactor is in tact)

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some amazing before and after pictures here, and clearly whole towns were wiped out. the slider on each picture is great...

http://www.abc.net.au/news/events/japan-quake-2011/beforeafter.htm

the death toll has got to significantly rise from what it is at the minute (2000+ confirmed dead, sadly i see the death toll being more like 10000+)

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Cheers worm, a well informed safety assessment ;)

Basically, on a normal day, the nuclear reactions take place inside big steel cylinders. The reactions are really, really hot. Enough to melt through steel. A nuclear meltdown is when the reacting nuclear material melts through the steel and escapes. This is normally avoided by pumping water round the reactors to keep them cool.

When the earthquake happened it f**ked the water pumping system. Meaning the cooling stopped.

Earthquakes are obviously in the little black book of problems that can happen, so they had a system whereby they would pump sea water instead, which is what they've been doing. However this latest explosion (and i have to admit, I don't know why this has happened), disrupted this emergency cooling system, meaning the reactors were without cooling for a couple of hours. They got the water going again in time apparently. But japanese news is reporting they've just had *another* explosion there in the last hour. If they can't keep those reactors cooled then they'll go into meltdown.

Where's superman when you need him

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Japan also announced a 30-km no-fly zone around the reactors to prevent planes spreading the radiation further afield.

Radiation levels around Fukushima for one hour's exposure rose to eight times the legal limit for exposure in one year, said the plant's operator, the Tokyo Electric Power Co (Tepco).

The International Atomic Energy Agency said after Tuesday's blast that radiation dosages of up to 400 millisieverts per hour had been recorded at the site.

Exposure to over 100 millisieverts a year is a level which can lead to cancer, according to the World Nuclear Association.

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