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Re:Masao Yoshida, Nuclear Engineer and Chief at Fukushima Pl... by velodrome on Tuesday July 09, 2013 @05:06PM (#6015500)
It has to do with the amount of radioactive material and half-life.

From wikipedia:

The Fukushima plants have tons of nuclear fuel, thousands of Fuel Assemblies, more than 6,000 fuel rods in Spent fuel pools. ---

Fukushima: 1500-2000 tons of spent fuel rods

Little Boy: 0.07 tons (140 lbs)

Fat Man: .0068 tons (13.6 lbs)

http://news.sciencemag.org/scienceinsider/2011/03/how-much-f...

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