The Russian-built 1,000-megawatt reactor near the coast city of Bushehr, was plugged into Iran's national grid last September, ending years of delays and suspicions that Moscow was using the project as a diplomatic lever.
Bushehr was started by Germany's Siemens before the 1979 Islamic Revolution and was taken over by Russian engineers in the 1990s.
The United States for years urged Russia to abandon the project.
PA/PA
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MNA