In the wake of Japan's 2011 Fukushima nuclear crisis, the combination of design and location of Metsamor was again claimed to make it among the most dangerous nuclear plants in the world. The Metsamor power station is one of the few remaining nuclear reactors of its kind that were built without primary containment structures. Armenian authorities and nuclear experts have also dismissed the possibility of a repeat of Fukushima, citing numerous safety upgrades the plant has received since one of its reactors was restored into operation in 1995.