\" \" French researchers did detect cesium-137 in a limited sample of California wines, but the levels weren't high enough to pose a threat to human health. franckreporter/E+/Getty ImagesIn March 2011, an offshore earthquake triggered a tsunami that crippled the Fukushima Daiichi nuclear power plant and caused a partial meltdown of three reactor cores. The scientists reported a tiny but measurable increase in the level of radioactive cesium-137 just after the Japanese nuclear accident. notes the Department of Viticulture and Enology at the University of California, Davis on a related July 25 Facebook post. According to Reuters, tour groups of sightseers have been visiting the region where the crippled nuclear plant is located and observing the still-continuing plant cleanup from a distance.