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I think four of the six on site, but they have not all had the same problems. The explosions were actually in the reactor buildings, not inside the reactor pressure vessels, and these explosions were due to hydrogen accumulating and forming an explosive mixture with air

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Q: How many reactors have exploded at the Fukushima Daiishi nuclear power plant?
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Who designed the reactors in the Fukushima I Nuclear Power Plant?

General Electric

What are some examples of nuclear disaster?

Some examples of nuclear disasters include the Chernobyl disaster in 1986 where a reactor at the Chernobyl Nuclear Power Plant in Ukraine exploded, releasing a significant amount of radioactive material. Another example is the Fukushima Daiichi nuclear disaster in 2011, where a series of equipment failures and a tsunami caused meltdowns at multiple reactors in the Fukushima Daiichi Nuclear Power Plant in Japan. These disasters have had long-lasting environmental and health impacts.

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Those reactions that take place in functioning nuclear reactors (i.e not Chernobyl or Fukushima when the accidents happened).

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Present 2013. None. All are active. Fukushima has been 'Decommissioned'.

How have energy supplies in Japan changed since the tsunami?

Though Fukushima has lost 4 of its Nuclear Reactors, There are many more Nuclear Reactos running in Japan, Secondly Japan is mostly using Coal and Gas to compesate for fukushima.

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It exploded because, seawater into the cores of the wrecked reactors fast enough to keep up with the steady heating.

How are nuclear reactors used in nuclear reactors?

Well, as nuclear reactors are nuclear reactors, nuclear reactors are not used inside nuclear reactors.

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Before the Fukushima Daiichi Disaster, there were 54 operational nuclear reactors in Japan. Three of those melted down, and one had problems that rendered it inoperable. The government has decided the other two reactors at Fukushima Daiichi cannot be restarted. Also, as other reactors have been shut down for maintenance or refueling, they have not been restarted, with the result that now, in early December 2011, only eight Japanese reactors remain in operation.

What is the word for the molten nuclear fuel plasma that will form in the fukushima reactors?

The solidified fuel and debris that melted in a meltdown is often called lava.

Did the tsunami water reach the nuclear reactors in japan?

Yes. That's how the diesel generators were damaged at Fukushima Daiichi, leading to the current crises there. Note that the reactors themselves were not touched by the tsunami because of the containment structures in place.

When did Timeline of the Fukushima nuclear accidents happen?

Timeline of the Fukushima nuclear accidents happened in 2011.

How many of Japan's Nuclear Power Plants are under threat of Meltdown?

I only know what is on public news, it seems to be Fukushima but there are several reactors there, not clear if all are involved