Nuclear Regulatory Commission requires changes at 31 plants . NRC wants enhancements to help contain damage from any accident . An industry group said the new order is in line with its assessment of the `` most effective means '' to address venting . They are similar in design to Fukushima accident in Japan . Nuclear , which caused meltdown at Fukushima in Japan .
Nuclear Regulatory Commission requires changes at 31 plants . NRC wants enhancements to help contain damage from any accident . They are similar in design to Fukushima accident in Japan . Nuclear , which caused meltdown at Fukushima in Japan .