Many U.S. Nuclear Plants Ill-Prepared to Handle Simultaneous Threats The U.S. government finds that many U.S. nuclear plants would fail to face multiple challenges at the same time as happened at Fukushima Daiichi On April 26, Nuclear Regulatory Commission staff did a safety "walkdown" of the Diablo Canyon nuclear power plant on southern California's coast, part of NRC inspections of all U.S. reac