WASHINGTON ( CNN ) -- Iran 's efforts to develop its nuclear program have been stymied by a raft of challenges from international sanctions and set back by the 2010 Stuxnet cyberattack , two new reports from a Washington nuclear think tank conclude . The reports by former weapons inspector David Albright 's Institute for Science and International Security ( ISIS ) say Iran has been forced to use inferior parts and weaker metals , according to officials the group has spoken to at the International Atomic Energy Agency ( IAEA ) , because sanctions have limited access to needed materials . `` Ten years after the start of construction at the Natanz enrichment site , the probability that Iran will build tens of thousands of centrifuges seems remote based on their faulty performance , '' one of the reports notes . `` Even with advanced centrifuges , Iran may be blocked by sanctions from building advanced centrifuges in large enough numbers . '' The Natanz enrichment site was crippled when a computer virus attacked a portion of the centrifuges . But the ISIS report notes enrichment numbers have rebounded to a higher level than before Stuxnet , after a brief dip . The IAEA noted in recent reports , however , that not all the centrifuges are necessarily enriching . Albright 's report says that the Stuxnet worm may have decreased the lifespan of aging centrifuges , even if they were not broken right away , by forcing them to spin at altered speeds . However , despite the challenges , based on ISIS assessment of Iran 's production of enriched uranium , the report concludes the Iranians have more than enough for the stated goal of providing for its research reactor , and Iran appears on a trajectory `` to producing weapons-grade uranium for nuclear weapons . ''
New reports cite the effects of international sanctions on Iran 's nuclear efforts . A cyberattack also had a crippling effect on an enrichment site . But Iran has more than enough enriched uranium for its research reactor . Reports : Iran appears on a trajectory `` to producing weapons-grade uranium ''