U.S. nuclear officials say exhaustive reviews of safety standards and procedures have been conducted at American reactors since the Japanese nuclear crisis stemming from a March earthquake and tsunami. That's what leaders of the Nuclear Regulatory Commission sought to reassure wary lawmakers Thursday at a senate hearing.

One hundred and four nuclear power reactors currently operate in the United States, providing roughly 20 percent of the nation’s electricity. It has been more than three decades since the United States suffered a major nuclear scare - the 1979 partial core meltdown at Three Mile Island in Pennsylvania, which resulted in no deaths or injuries. More...

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