TOKYO (AP) — As radiation spewed from Japan’s nuclear disaster three years ago, the top U.S. atomic energy regulator issued a 50-mile evacuation warning for any Americans in the area, a response some found extreme.

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.