MOSCOW (Sputnik) — Iran has removed the core vessel of the Arak reactor, and International Atomic Energy Agency (IAEA) inspectors will visit the site later for verification, Iranian Atomic Energy Organization spokesman Behrouz Kamalvandi said Thursday.

"Yesterday, we completed the last stage of removing the reactor's core vessel, all associated work was completed today… IAEA inspectors will begin verification work tonight," Kamalvandi was quoted as saying by Fars news agency.

Iranian Deputy Foreign Minister Abbas Araqchi said Wednesday the full implementation of the nuclear deal with six world powers would take place no later than this weekend. Araqchi added that the International Atomic Energy Agency was expected to reveal its final report on Iran by Friday.

Earlier in the day, Director General of Iran's Foreign Ministry in Political and International Security Affairs Hamid Baedinejad said Iran was on the final stage of fulfilling the Joint Comprehensive Plan of Action (JCPOA).

In July, Iran and the six world powers, namely Russia, China, the United States, France the United Kingdom and Germany, signed a historic deal on Tehran's nuclear program. The deal guarantees the peaceful nature of Iran's nuclear activities in exchange for sanctions' relief.

In December, the UN's International Atomic Energy Agency adopted a final resolution to close an investigation into allegations that Iran was developing nuclear weapon, which means all previous UN Security Council sanctions imposed on Iran over its nuclear program will no longer apply once the JCPOA takes effect.