Japan updated his months old nuclear disaster to a maximum seven atomic international crises Tuesday, placed it on a par with the Chernobyl disaster a quarter century ago.
The revaluation to a "serious accident" with "widely used health and impact on the environment" based on the entire radiation, officials said one-tenth of the accident in 1986 was in the former Soviet Union.
To stabilize their struggle, as workers continue to the charred reactors Japan shaken by more aftershocks from the earthquake of magnitude 9.0 on 11 March, which sent a massive tsunami barreling in the North-East Coast.
The current number of the disaster, the country's worst crisis since the war, more than 13,000 people killed and more than 14,000 other links is missing. About 150,000 people are still in shelters.
In the latest in a series of earthquakes in the last few days an powerful 6.3 magnitude hit Fukushima Prefecture tremor Tuesday afternoon, forcing the temporary evacuation of the nuclear plant workers and rattle buildings in Tokyo.
"In about a week, we thought that the greatest threat in the work was a new hydrogen explosion", said a senior official, named not responsible are. "But now, if we a large image view of the plant, the biggest threat is definitely aftershocks and tsunamis."
Japan has more than 400 more than since March 11 experienced 5.0 in the order of magnitude larger aftershocks.
The review on the UN international nuclear event scale (INES) came when ready, more people live Japan extending close to the plant, 20 kilometers (12 miles) exclusion zone in several cities of far away take to evacuate.
Level seven accidents on the INES scale includes a "major release of radioactive materials with widely spread health and the environment implementation of the planned effects and advanced countermeasures".
Each level on the scale is one about which to 10-fold increase in the severity.
The previous review of five were the unfolding disaster of the tsunami-hit Fukushima plant northeast of Tokyo on the same level as the 1979 three mile Iceland accident in the U.S. State of Pennsylvania.
Despite the Agency upgrade, nuclear safety, the official Hidehiko Nishiyama it said were differences between the accidents marks Chernobyl and Fukushima.
"Chernobyl, was acute exposure to high levels of radiation, and 29 people died from it." This is not the case in Fukushima, "said he."
The long-term death toll from the Chernobyl accident, in the today's Ukraine, enough UN estimate of one in 2005 by 4000 killed proposed to dozens or even hundreds of thousands of non-governmental groups.
The official also said that while the Chernobyl reactor had exploded, "in Fukushima... the reactors remained intact even though we see some leakage".
However, an official for operator Tokyo electrical power co. (TEPCO) said that media reports "the radiation leak was not completely finished and our concern is that it could eventually exceed Chernobyl", said.
Nuclear experts look at Fukushima have said that partial meltdowns took place when cooling reactor does not cause a series of explosions, leaked the radioactive material into the atmosphere.
Tens of thousands of residents were evacuated from the 20-kilometre exclusion zone and have people in a further 10 km band, inside stay informed was.
On Monday the Government has to that it would order several other communities further out because of concerns about long-term exposure to radiation, but that a uniform extension of the zone was not appropriate.
Emergency crews in the work have fought around the clock to bring the disaster under control and on Monday, the Government said that the risk of a major leak of radioactive material had become "much smaller".
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