One in five U.S. nuclear plants shares the same reactor design as the ill-fated Fukushima Dai-ichi plant in Japan. That includes Oyster Creek Nuclear Generating Station in New Jersey, the nation's oldest operating nuclear plant — which is already scheduled to close in 2019. The threat of a major earthquake or tsunami in the area is low. But critics of nuclear power warn that the cooling systems at Oyster Creek, and other nuclear plants in the region, could be vulnerable to flooding from a major hurricane.