Fukushima radiation sizzling at 10 sieverts in flooded basement of unit 1 29 Jun 2012 Tokyo Electric Power Co. said Wednesday that radiation levels exceeding 10 sieverts have been detected in the flooded basement of reactor 1 at the crippled Fukushima No. 1 nuclear plant, a development that will hamper its decommissioning. Radiation from the basement water was found to be as high as 10,300 millisieverts an hour, a deadly intensity that will deliver the maximum annual dose in only 20 seconds and sicken anyone who is exposed within minutes. Tepco said the radiation level in unit 1, the first of the three reactors hit by hydrogen explosions and meltdowns during the crisis, is 10 times higher than in units 2 and 3, which also suffered meltdowns.
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