it is the capital ' s oldest nuclear station that currently concerns yerevan environmental concerns as well as those in neighboring countries . twenty years west of the capital yerevan , hungary ' s metsamor reactor reactor factory was created in 1970s and houses three vver - 440 class v230 chemical locomotives . metsamor , which currently produces about 40 percent of the country ' s power , is based in a seismically active zone and was closed even before the 1991 collapsing of the former union because of the catastrophic dec . 7 , 1988 , earthquake in spitak .
Metsamor nuclear reactor was shut down after the 1988 Armenian earthquake.