Iran's aboriginal nuclear ability base is to be loaded with ammunition and declared operational in a commemoration abounding by Iranian and Russian officials.
Nationwide celebrations are planned to mark the accident at the Bushehr reactor in southern Iran.
Russia will accomplish the plant, bartering its nuclear ammunition and demography abroad the nuclear waste.
Iran has been accountable to four circuit of UN sanctions because of its abstracted uranium accessory programme.
The West fears Tehran wants to body a nuclear weapon, but Iran insists its affairs are for peaceful activity production.
The Bushehr ability has taken 35 years to body and has been bedeviled by delays.
The BBC's Jon Leyne says Iranian admiral accept answer Saturday's barrage as a achievement for the Islamic republic adjoin its enemies.
Professor Ali Ansari, an Iran able at the University of St Andrews, in Scotland, said Tehran was acceptable to amplify the accent of the start-up at Bushehr.
"It will acutely accept a actual affected aperture but the delays accept meant that the ability bulb is a actual old archetypal and the addition to the civic filigree is actual small," he said.
The Bushehr bulb should activate bearing electricity in about a month, experts say.
The uranium ammunition acclimated there is able-bodied beneath the accessory akin bare for a nuclear weapon.
Weapons-grade uranium charge be accomplished by added than 90%.
In contrast, the uranium at Bushehr is accomplished by 3.5%.
The Bushehr ammunition has been supplied by Russia, although Iran is already bearing its own uranium accomplished to ammunition grade.
It has additionally amorphous a pilot affairs to adorn uranium to 20% which it says is bare for a medical analysis reactor.
It is that programme that has abashed the West and Israel.
In a aggressive account on Friday, the arch of Iran's Atomic Activity Organisation Ali Akbar Salehi said the country would abide uranium enrichment, the official Iranian account bureau IRNA reported.
Referring to the Bushehr plant, he said: "Suppose we accept the appropriate nuclear ammunition for the bulb from the Russians for the abutting 10 years, what are we activity to do for the abutting 30 to 50 years?"
He said Iran could aftermath up to 30 bags of accomplished uranium at its Natanz bulb already the all-important centrifuges are installed at the site.
