Gregory Jaczko, who stepped down as chairman of the Nuclear Regulatory Commission in 2012, still believes he was right, and says the events at the Fukushima Dai-Ichi plant show that nuclear power should be phased out in Japan and worldwide. “The lesson has to be: This kind of accident is unacceptable to society. And that’s not me saying it. That’s society saying that,” he said in an interview this week in Tokyo, where he is...