Wall Street Journal: The Three Mile Island accident in 1979 confirmed many people’s fears about the danger of nuclear power and led to expensive safety upgrades for planned and existing plants. A recession slashed demand for electricity, inflation made new nuclear plants more expensive and falling energy prices made nuclear power less competitive with other power sources. Then, in 1986, the Chernobyl accident in Ukraine killed at least 56 people directly and spread radiation throughout much of Europe. …