( CNN ) - Iranian President Mahmoud Ahmadinejad was expected to offer details of "good news on the nuclear front," during a speech at the Natanz nuclear facility in central Iran on Monday afternoon, Iranian media reported.
Ambassadors of Islamic and non-aligned countries have been invited to attend the ceremonies.
Analysts believe the announcement could involve 3,000 centrifuges -- the machines used for uranium enrichment -- that Iran has said would be operational soon.
If Tehran were to have that number of centrifuges operational, it would allow Iran to begin industrial scale production of nuclear fuel at the plant, some 200 kilometers ( 125 miles) south of Tehran.
Iran has repeatedly said uranium enrichment, which the United Nations has demanded it stop, is its right and will not be abandoned. The 15-member Security Council voted unanimously last month to pass Resolution 1747.
The U.S. and other nations contend that Iran is using the project to develop nuclear weapons, a claim Iran denies.
Iran currently runs 350 experimental centrifuges at an above ground pilot facility at Natanz, Reuters reported.
Throughout Iran on Monday, schools celebrated "National Technology day," marking the date 27 years ago that Washington broke diplomatic relations with Tehran.