A partial meltdown of fuel rods inside the reactor vessel was responsible for the high levels of radiation at that reactor although Chief Cabinet Secretary Yukio Edano said the radiation had mainly been contained in the reactor building.
TEPCO later said radiation above 1,000 millisieverts per hour was found in water in tunnels used for piping outside the reactor.
That is the same as the level discovered on Sunday. The U.S. Environmental Protection Agency says a single dose of 1,000 millisieverts is enough to cause hemorrhaging.
TEPCO officials said the underground tunnels did not flow into the sea but the possibility of radioactive water seeping into the ground could not be ruled out.
Greenpeace said its experts had confirmed radiation levels of up to 10 microsieverts per hour in a village 40 km (25 miles) northwest of the plant. It called for the extension of a 20-km (12-mile) evacuation zone.
"It is clearly not safe for people to remain in Iitate, especially children and pregnant women, when it could mean receiving the maximum allowed annual dose of radiation in only a few days," Greenpeace said in a statement, referring to the village where the radiation reading was taken.
More than 70,000 people have been evacuated from an area within 20 km (12 miles) of the plant and another 130,000 people within a zone extending a further 10 km are recommended to stay indoors. They have been encouraged to leave.
Of course, TEPCO officials are disputing Greenpeace's readings and they are of course saying everything is fine, even while admitting to the partial meltdown, something I called weeks ago. Meanwhile, they have appealed to French nuclear technicians for assistance. Whether or not that will make a difference here at this partial meltdown juncture is anyone's guess.
TEPCO stock is limit down on the Nikkei at this hour again. It's lost two-thirds of its value in the last two weeks, going from 2,100 yen a share to under 700.
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