Prime Minister Naoto Kan urged people within 30 km (18 miles) of the facility north of Tokyo to remain indoors and conserve power amid the world's most serious nuclear disaster since the Chernobyl disaster in Ukraine in 1986.guess handbags
As concern about the crippling economic impact of the nuclear and earthquake disasters mounted, Japanese stocks fell as much as 14 percent before ending down 9.5 percent, compounding a slide of 7.6 percent the day before. The two-day fall has wiped some $620 billion off the market.
The French Embassy in Tokyo warned in an 0100 GMT advisory that a low level of radioactive wind could reach the capital -- 240 km (150 miles) south of the plant -- in about 10 hours.
Radiation levels in the city of Maebashi, 100 km (60 miles) north of Tokyo were up to 10 times normal levels, Kyodo news agency said. Only minute levels were found in the capital itself, which so far were "not a problem", city officials said.
"The possibility of further radioactive leakage is heightening," a grim-faced Kan said in an address to the nation. "We are making every effort to prevent the leak from spreading. I know that people are very worried but I would like to ask you to act calmly."
There were two explosions on Tuesday at two of the reactors at the nuclear facility after days of frantic efforts to cool them. Japan told the U.N. nuclear watchdog a spent fuel storage "pond" was on fire and radioactivity was being released "directly" into the atmosphere.
Levels of 400 millisieverts per hour had been recorded at the plant, the government said. Exposure to over 100 millisieverts a year is a level which can lead to cancer, according to the World Nuclear Association.
Japan announced a 30-km no-fly zone around the reactors.
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Despite pleas for calm, residents rushed to shops in Tokyo to stock up on supplies. Don Quixote, a multi-storey, 24-hour general store in Roppongi district, sold out of radios, flashlights, candles and sleeping bags.
In a sign of regional fears about the risk of radiation, China said it was strengthening monitoring of the area and Air China said it had canceled flights to Tokyo.
But the blasts could expose the population to longer-term exposure to radiation, which can raise the risk of thyroid and bone cancers and leukemia , he said. Children and fetuses are especially vulnerable.
Chief Cabinet Secretary Yukio Edano, talking of levels of radiation at the Fukushima Daiichi plant's No. 4 reactor, said: "There is definitely a possibility that this could affect people's bodies."
Many of the worrying milestones mapped out by experts have been passed, with some workers having left the complex and people living within 30 km told to stay indoors. power balance
There have been a total of four explosions at the plant since it was damaged in last Friday's massive quake and tsunami. The most recent were blasts at reactors No. 2 and No. 4.
There was a real possibility of a leak in the No.4 reactor container, which houses the nuclear fuel rods, according to Murray Jennex, a professor at San Diego State University in California.
Concerns center on damage to a part of the reactor core known as the suppression pool, which helps cool and trap the majority of cesium, iodine, strontium in its water. The nature of the damage was unclear, as was its impact on the containment structure, a thick steel vessel that surrounds the core.
Jennex said the crisis in Japan, the only nation to have suffered a nuclear attack, was worse that the Three Mile Island disaster of 1979.
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