Deborah (1 Feb 2011)
"Stuxnet Worm Again Attacking Iran Reactors - Could Cause Reactors to Explode Destroying Iran"

Stuxnet returns to Bushehr reactor. Russia warns of nuclear explosion
……Russian engineers employed at the reactor notified Moscow that Stuxnet was again attacking the Bushehr systems after apparently taking a rest from its first onslaught last June. There was no telling which systems had been infected, because a key feature of the virus is that the systems' screens show they are working normally when in fact they have been fatally disarmed. Activating the reactor in these circumstances could cause an explosion far more powerful than the disaster at the Russian reactor at Chernobyl, Ukraine in April 1986, which released 400 times more radioactive material than the atomic bombing of Hiroshima.

The impression the Rosatom chief had gained from his staff at Bushehr was that the Iranian teams had been ordered to activate the reactor at any price to prove that the Islamic Republic had beaten Stuxnet.. This concern overrode security. The consequences of ignoring this fearful hazard, said Kiriyenko, were unthinkable and would destroy the revolutionary Islamic regime in Tehran in their wake…….more at link above