FILE - In this March 30, 1979 file photo, a cooling tower at the Three Mile Island nuclear power plant near Harrisburg, Pa., looms behind an abandoned playground. Japan's Fukushima disaster, which will leave taxpayers there with a massive bill, brings to the fore one of the industry's key weaknesses _ that nuclear power is a viable source for cheap energy only if it goes uninsured. (AP Photo/Barry Thumma, file)