The control systems of Iran’s Bushehr nuclear plant have been penetrated by a computer worm unleashed last year, according to a foreign intelligence report that warns of a possible Chernobyl-like disaster once the site becomes fully operational.
Russia’s envoy to NATO, Dmitry Rogozin, also has raised the specter of the 1986 reactor explosion in Ukraine, but suggested last week that the danger had passed.
The report, drawn up by a nation closely monitoring Iran’s nuclear program and obtained by The Associated Press (AP), said such conclusions were premature and based on the “casual assessment” of Russian and Iranian scientists at Bushehr.
With control systems disabled by the virus, the reactor would have the force of a “small nuclear bomb,” it said.
“The minimum possible damage would be a meltdown of the reactor,” it says. “However, external damage and massive environmental destruction could also occur ... similar to the Chernobyl disaster.”
The virus, known as Stuxnet, has the ability to send centrifuges spinning out of control and temporarily crippled Iran’s uranium enrichment program. Some computer experts believe Stuxnet was the work of Israel or the US, two nations convinced that Iran wants to turn nuclear fuel into weapons-grade uranium.
Iran has acknowledged that the malware — malicious software designed to infiltrate computer systems — hit the laptops of technicians working at Bushehr, but has denied that the plant was affected or that Stuxnet was responsible for delays in the startup of the Russian-built reactor.
Tehran is reluctant to acknowledge setbacks to its nuclear activities, which it says are aimed at generating energy, but are under UN sanctions because of concerns they could be channeled toward making weapons. Only after outside revelations that its enrichment program was temporarily disrupted late last year by the mysterious virus did Iranian officials acknowledge the incident.
Ali Asghar Soltanieh, Iran’s chief representative to the International Atomic Energy Agency (IAEA), cut short attempts by AP to seek comment on possible damage by Stuxnet at Bushehr.
Rogozin, the Russian envoy, described how engineers at Bushehr “saw on their screens that the systems were functioning normally, when in fact they were running out of control,” conjuring up a frightening dimension to the potential fallout from the virus.
“The virus, which is very toxic, very dangerous, could have had very serious implications,” Rogozin told reporters, adding it “could have led to a new Chernobyl.”
Experts are split on how powerful the Stuxnet virus might prove.
Olli Heinonen, who retired last year as head of investigations of Iran’s nuclear programs at the IAEA, believes it could have infected control systems at Bushehr or elsewhere, causing “a lot of havoc.”
German cybersecurity researcher Ralph Langner says that while the virus has infested the reactor’s computers, “Stuxnet cannot technically mess with the systems in Bushehr.”
“Bottom line: A thermonuclear explosion cannot be triggered by something like Stuxnet,” said Langner, who has led research into Stuxnet’s effects on the Siemens equipment running Iran’s nuclear programs.
Langner said it could take about a year to clear the worm out of Bushehr’s systems. Western intelligence officials believe the site could be operational in coming months.
A spokeswoman for Atomstroyexport, the Russian company in charge of construction at Bushehr, also cast doubt on there being major damage at the plant, saying its control system is fully autonomous and virus-proof.
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