NISA doubles early fallout estimate
NISA on Monday more than doubled its estimate of the radioactive material ejected into the air in the early days of the Fukushima nuclear crisis to 770,000 terabecquerels.
The nuclear safety agency also issued its own assessment of the cores in reactors 1, 2 and 3 at the Fukushima No. 1 power plant, assuming that all of them melted, and said it was possible the meltdowns in units 1 and 2 happened faster than the time frame estimated by Tokyo Electric Power Co.