"We are waiting for the Iranians to complete a seismic survey of the site, after which we plan to begin construction before the end of the year," a source at Rosatom told the agency.
Last month head of Iran's Atomic Energy Organization Ali Akbar Salehi said that work on the two reactors at Bushehr had been delayed for technical reasons, and disagreements in some areas.
"We will begin work as soon as we reach a consensus. We expect construction to begin this year," Salehi said.
Work on the unique project, which installed Russian nuclear technology into the German-built reactor buildings, was completed in 2011, when the plant began operating at low levels, and in March 2012 the reactor reached full capacity, providing Iran's national grid with 1,000 megawatts of power.
In November 2014 Russia and Iran signed a Memorandum of Understanding on the construction of up to eight more reactors in Iran using Russian technology, two of which are planned to be built at Bushehr.
