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Japan nuclear meltdown ?maybe worse than thought?

Molten nuclear fuel at Japan’s Fukushima plant might have eaten two thirds of the way through a concrete containment base, its operator said, citing a new simulation of the extent of the March disaster.

Tokyo Electric Power (TEPCO) said their latest calculations showed the fuel inside the No. 1 reactor at the tsunami-hit plant could have melted entirely, dropping through its inner casing and eroding a concrete base.image

In the worst-case scenario, the molten fuel could have reached as far as 65 centimetres (2 feet) through the concrete, leaving it only 37 centimetres short of the outer steel casing, the report, released Wednesday, said.

Until now, TEPCO had said some fuel melted through the inner pressure vessel and dropped to the containment vessel, without saying how much and what it did to the concrete, citing a lack of data.

"Almost no fuel remains at its original position," TEPCO said in the report.

Two other reactors at the Fukushima Daiichi plant also went into meltdown when the tsunami knocked out cooling systems at the plant.

However, only about 60 percent of their fuel dropped through to the concrete floor and caused less damage, the report projected.

The molten fuel in the three reactors is believed to have stayed cool and stable because water has been injected into the vessels, the utility said.

Read More:http://uk.news.yahoo.com/japan-nuclear-meltdown-maybe-worse-thought-081203089.html

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