 A 2011 Natural Resources Defense Council report that evaluated the seismic hazard to reactors worldwide, as determined by the Global Seismic Hazard Assessment Program data, placed Busheher within the second group of 36 reactors within high seismic hazard areas, at lower risk than 12 reactors within very high seismic hazard areas in Japan and Taiwan.Iran is with Israel one of the two countries in the world with significant nuclear activities not to ratify the 1994 Convention on Nuclear Safety, a system of peer review and mutual oversight, and it has been suggested that nuclear safety in Iran could benefit from Iran and Israel signing the convention.In October 2012, the plant had to be shut down to limit damage after stray bolts were found beneath the fuel cells, contradicting Iran's earlier assurances that nothing unexpected had happened and that removing nuclear fuel from the plant was just routine.