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 leading expert in nuclear safety at the University of Southern California Najmedin Meshkati, awake at night. 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 Bushehr and elsewhere. The biggest nuclear threat from Iran is not from an attack but from an accident, and international sanctions are only increasing the risk he claims.

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Source: New Scientist