Earlier this year an Iranian nuclear scientist at the uranium conversion facility at Isfahan died from poisoning with uranium hexafluoride gas. Accidents like this keep awake at night. A leading expert in nuclear safety at the University of Southern California, the Iranian-born engineer worries that the Russian technology and human error that led to the Chernobyl disaster may cause a similar tragedy at Iran’s nuclear facilities in and elsewhere. The biggest nuclear threat from Iran is not from an attack but from an accident, he told , and international sanctions are only increasing the risk.
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