Furthermore, a nuclear plant CANNOT be blown up. A bomb converts a large part of its U-235 or plutonium into fission fragments in about 10 seconds and then flies apart. This depends on the fact that a bomb is a very compact object, so the neutrons don't have far to go to hit another fissionable atom. A power plant is much too big to convert an important part of its fissionable material before it has generated enough heat to fly apart. This fact is based on the fundamental physics of how fast fission neutrons travel. Therefore, it doesn't depend on the particular design of the plant. ~ http://www-formal.stanford.edu/jmc/progress/nuclear-faq.html
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