Behrouz Kamalvandi, who is the spokesman for the Atomic Energy Organization of Iran (AEOI), said on Thursday that Tehran and Moscow reached a deal on stable isotopes about a year ago.
Different Iranian delegates traveled to Russia and Russian experts visited Iran, he added.
“Today, we are at the stage of installing some equipment and Russian experts will arrive in Iran on Sunday to begin the installation work,” Kamalvandi said, noting that the project will probably begin on Sunday or the following day.
Earlier on Thursday, the AP quoted Russia’s RIA Novosti news agency as saying that Russian technical specialists were set to arrive this week at Iran’s Fordow nuclear facility.
Director General of the International Atomic Energy Agency (IAEA) Yukiya Amano said last January that Iran had removed “excess centrifuges and infrastructure” from the Fordow enrichment facility in line with its commitments under the 2015 nuclear agreement.
Amano made the comment in a statement issued on the first anniversary of the implementation of the nuclear deal, known as the Joint Comprehensive Plan of Action (JCPOA), between Iran and the P5+1 group of countries.