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Every one step on the climb over indicates an escalation of 10 time the severity of the step less than it, the International Atomic Energy Agency says.The Chernobyl nuclear accident concerning the previous Soviet Union rated a 7, the highest level on the extent, while Japans other nuclear disaster a 1999 accident next to Tokaimura concerning which workers died following being exposed to radiation rated a 4.But the rating difference was not due to original problems next to the place in the ground, understood Hidehiko Nishiyama, deputy lead of the nuclear safety agency.pretty, it came gone Japanese establishment got a better assessment of what did you say? had happened, partly based on images presentation harm to fuel rods and other structures inside several reactor buildings.IAEA Director broad-spectrum Yukiya Amano cautioned anti recitation too much into the raised assessment, adage it is too the first part of to cause to feel a broad assessment.Yet Peter Bradford, a limb of the U.