The 104 nuclear reactors providing 20 percent of America's electric power were designed and built in the 1960s and '70s, an era when seismologists knew much less about earthquakes than they do today.
Now that Japan's 9.0 magnitude earthquake has focused world attention on desperate efforts to halt the release of deadly radiation and on warnings to parents not to give their young children radiation-tainted tap water in Tokyo, U.S. regulators and nuclear industry advocates are scrambling to convince the public that America's reactors are safe.
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