Head of Atomic Energy Organization of Iran (AEOI), Fereidoon Abbasi, said Wednesday that the Islamic republic will "decisively" continue uranium enrichment, semi- official Mehr news agency reported.

Abbasi also said that Iran will test the Arak research reactor plant using "virtual fuel" in near future, said the report.

"I determinedly announce that the (work in) the Arak reactor plant is advancing according to the schedule and without any problem," he was quoted as saying.

He denied delays in launching the plant due to some technical problems, saying that "We merely move ahead cautiously due to security considerations, since the enemy wants to cause damage in this reactor. We don't have any technical problems or budget problem."

"All the equipments which are needed for the preparation of the reactor have been bought from the market," he went on.

According to earlier report of the International Atomic Energy Agency (IAEA), Iran's IR-40 heavy water research reactor, near the central city of Arak, was scheduled to begin operation at the end of 2013.

However, the recent report by the IAEA said that the country had postponed the start-up of the reactor until 2014.

Western countries suspect that the Arak establishments or the uranium enrichment facilities of Iran might be used to produce material for the production of nuclear weapon, the allegations which have been rejected by the Islamic republic.

About the operation of the country's Bushehr nuclear power plant, Abbasi said that "Currently, final tasks in Bushehr reactor are being carried out and the final tests before the Iranian operator to take over (the responsibility of) the reactor (from the Russians) have been conducted."

"All the problems (the reactor encountered) in the past year have been corrected," he said, adding that "Soon, the reactor will be connected to the (national) grid and we will witness stable electricity flow in the grid."

The semi-official ISNA news agency, quoting an informed source, reported on Wednesday that Iran has reloaded fuel in Bushehr nuclear power plant after a temporary removal of it.

On Nov. 16, the IAEA said in a report that Iran unloaded fuel from the reactor core of Bushehr power plant in October and transferred it to a spent fuel pond.