AdvertisementSo Far, Nuclear Agency Confident In U.S. Reactors03:32Download AudioResumeMay 12, 2011Richard HarrisfacebookEmailA worker checks the status of the water level at the Unit 1 reactor at the Fukushima Dai-ichi nuclear power plant in Japan on Tuesday. Japanese officials said the reactor doesn't appear to be holding water, which means its core probably sustained more damage than originally thought. (AP)