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Fishermen beside the San Onofre Nuclear Power Plant in north San Diego County on March 15, 2011.  The San Onofre Nuclear Power Plant sits at the edge of the Pacific Ocean on a  84-acre site between San Diego and Orange County and provides much of Southern California its power. US Energy Secretary Steven Chu assured lawmakers worried about quake-hit Japan's nuclear crisis that US atomic facilities had "rigorous" safety measures that anticipate major natural disasters. "The American people should have full confidence that the United States has rigorous safety" rules and that nuclear plant builders "clearly consider things like tsunamis ... and earthquakes," Chu told a key congressional committee. 
AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images) Mark Ralston, AFP / Getty Images