Iran's President Mahmoud Ahmadinejad (C) visits the Natanz uranium enrichment facilities 200 miles (322 km) south of the Tehran, Iran on April 8, 2008. President Mahmoud Ahmadinejad announced that Iran started installation of some 6,000 new centrifuges on Tuesday. (UPI Photo/President's official website) | License Photo

An error is seen on a computer screen of Bushehr nuclear power plant's map in the Bushehr Port on the Persian Gulf, 1,000 kms south of Tehran, Iran on February 25, 2009. Iranian officials said the long-awaited power plant was expected to become operational last fall but its construction was plagued by several setbacks, including difficulties in procuring its remaining equipment and the necessary uranium fuel. (UPI Photo/Mohammad Kheirkhah) | License Photo

Iranian clergymen stand next to a missile defense pad during an air defense war games some 200 miles southwest of the capital Tehran, Iran, Tuesday, Nov. 24, 2009. This is the third day of the large-scale air defense war games that are meant to protect the Iranian nuclear facilities from attack. UPI/Fars News Agency/Ali Shaigan | License Photo

The International Atomic Energy Agency (IAEA) inspectors arrive at Emam Khomeini airport in Tehran, Iran on October 25,2009. UPI/Maryam Rahmanian .. | License Photo

Iran's President Mahmoud Ahmadinejad (C) visits the Fuel Manufacturing Plant (FMP)'s building at Isfahan Uranium Conversion Facility (UCF) during a ceremony for Iran's national nuclear technology day just outside the city of Isfahan, 410 kilometers (255 miles) south of Tehran, Iran on April 9, 2009. (UPI Photo/Mohammad Kheirkhah) | License Photo

An Iranian woman stands in front of a banner explains process of making uranium oxide (U3O8) to uranium hexafluoride (UF6) as she visits an exhibition about Iran's nuclear program at Tehran University campus in Tehran, Iran on November 26 , 2008. (UPI Photo/Mohammad Kheirkhah) | License Photo

An Iranian technician works at Bushehr nuclear power plant in the Bushehr Port on the Persian Gulf, 1,000 kms south of Tehran, Iran on February 25, 2009. Iranian officials said the long-awaited project was expected to become operational last fall but its construction was plagued by several setbacks, including difficulties in procuring its remaining equipment and the necessary uranium fuel. (UPI Photo/Mohammad Kheirkhah) . | License Photo

Iranian technicians work inside Fuel Manufacture Plant (FMP)'s building at Isfahan Uranium Conversion Facility (UCF) during a ceremony for Iran's national nuclear technology day just outside the city of Isfahan, 410 kilometers (255 miles) south of Tehran, Iran on April 9, 2009. (UPI Photo/Mohammad Kheirkhah) | License Photo

Iranian technicians work inside Fuel Manufacturing Plant (FMP)'s building at Isfahan Uranium Conversion Facility (UCF) during a ceremony for Iran's national nuclear technology day just outside the city of Isfahan, 410 kilometers (255 miles) south of Tehran, Iran on April 9, 2009. (UPI Photo/Mohammad Kheirkhah) | License Photo

Iran's President Mahmoud Ahmadinejad (C) visits inside Fuel Manufacturing Plant (FMP)'s building at Isfahan Uranium Conversion Facility (UCF) during a ceremony for Iran's national nuclear technology day just outside the city of Isfahan, 410 kilometers (255 miles) south of Tehran, Iran on April 9, 2009. (UPI Photo/Mohammad Kheirkhah) | License Photo

Iran's President Mahmoud Ahmadinejad (C) visits the Fuel Manufacturing Plant (FMP)'s building at Isfahan Uranium Conversion Facility (UCF) during a ceremony for Iran's national nuclear technology day just outside the city of Isfahan, 410 kilometers (255 miles) south of Tehran, Iran on April 9, 2009. (UPI Photo/Mohammad Kheirkhah) | License Photo

Iranian technicians work inside Fuel Manufacturing Plant (FMP)'s building at Isfahan Uranium Conversion Facility (UCF) during a ceremony for Iran's national nuclear technology day just outside the city of Isfahan, 410 kilometers (255 miles) south of Tehran, Iran on April 9, 2009. (UPI Photo/Mohammad Kheirkhah) | License Photo

Iran's President Mahmoud Ahmadinejad (C) visits the Natanz uranium enrichment facilities 200 miles (322 km) south of the Tehran, Iran on April 8, 2008. President Mahmoud Ahmadinejad announced that Iran started installation of some 6,000 new centrifuges on Tuesday. (UPI Photo/President's official website) | License Photo

An Iranian music group sings in front of a nuclear sign during a ceremony marking the third anniversary of National Day of Nuclear Technology at international services of the Islamic Republic of Iran Broadcasting (IRIB) conference center in Tehran, Iran on April 8, 2008. President Mahmoud Ahmadinejad announced that Iran started installation of some 6,000 new centrifuges on Tuesday. (UPI Photo/Mohammad Kheirkhah) | License Photo

Iranian technicians work inside Fuel Manufacture Plant (FMP)'s building at Isfahan Uranium Conversion Facility (UCF) during a ceremony for Iran's national nuclear technology day just outside the city of Isfahan, 410 kilometers (255 miles) south of Tehran, Iran on April 9, 2009. (UPI Photo/Mohammad Kheirkhah) | License Photo

Iranian technicians work inside Fuel Manufacturing Plant (FMP)'s building at Isfahan Uranium Conversion Facility (UCF) during a ceremony for Iran's national nuclear technology day just outside the city of Isfahan, 410 kilometers (255 miles) south of Tehran, Iran on April 9, 2009. (UPI Photo/Mohammad Kheirkhah) | License Photo

Iranian technicians work inside Fuel Manufacturing Plant (FMP)'s building at Isfahan Uranium Conversion Facility (UCF) during a ceremony for Iran's national nuclear technology day just outside the city of Isfahan, 410 kilometers (255 miles) south of Tehran, Iran on April 9, 2009. (UPI Photo/Mohammad Kheirkhah) | License Photo

An Iranian surface to air missile sits poised next to Bushehr nuclear power plant in the Bushehr Port on the Persian Gulf, 1,000 kms south of Tehran, Iran on February 25, 2009. Iranian officials said the long-awaited project was expected to become operational last fall but its construction was plagued by several setbacks, including difficulties in procuring its remaining equipment and the necessary uranium fuel. (UPI Photo/Mohammad Kheirkhah) . | License Photo

Russian technicians work at Bushehr nuclear power plant in the Bushehr Port on the Persian Gulf, 1,000 kms south of Tehran, Iran on February 25, 2009. Iranian officials said the long-awaited project was expected to become operational last fall but its construction was plagued by several setbacks, including difficulties in procuring its remaining equipment and the necessary uranium fuel. (UPI Photo/Mohammad Kheirkhah) . | License Photo

An Iranian worker stands in front of Bushehr nuclear power plant in the Bushehr Port on the Persian Gulf, 1,000 kms south of Tehran, Iran on February 25, 2009. Iranian officials said the long-awaited project was expected to become operational last fall but its construction was plagued by several setbacks, including difficulties in procuring its remaining equipment and the necessary uranium fuel. (UPI Photo/Mohammad Kheirkhah) | License Photo

Russian technicians work at Bushehr nuclear power plant in the Bushehr Port on the Persian Gulf, 1,000 kms south of Tehran, Iran on February 25, 2009. Iranian officials said the long-awaited project was expected to become operational last fall but its construction was plagued by several setbacks, including difficulties in procuring its remaining equipment and the necessary uranium fuel. (UPI Photo/Mohammad Kheirkhah) | License Photo

A power plant employee works at Bushehr nuclear power plant in the Bushehr Port on the Persian Gulf, 1,000 kms south of Tehran, Iran on February 25, 2009. Iranian officials said the long-awaited power plant was expected to become operational last fall but its construction was plagued by several setbacks, including difficulties in procuring its remaining equipment and the necessary uranium fuel. (UPI Photo/Mohammad Kheirkhah) | License Photo

An Iranian technician works at Bushehr nuclear power plant in the Bushehr Port on the Persian Gulf, 1,000 kms south of Tehran, Iran on February 25, 2009. Iranian officials said the long-awaited project was expected to become operational last fall but its construction was plagued by several setbacks, including difficulties in procuring its remaining equipment and the necessary uranium fuel. (UPI Photo/Mohammad Kheirkhah) | License Photo

Iran's atomic energy chief Gholamreza Aghazadeh (3rd-L) shakes hand with his Russian counterpart Sergei Kiriyenko (with blue tie) before their press conference at Bushehr nuclear power plant in the Bushehr Port on the Persian Gulf, 1,000 kms south of Tehran, Iran on February 25, 2009. Iranian officials said the long-awaited power plant was expected to become operational last fall but its construction was plagued by several setbacks, including difficulties in procuring its remaining equipment and the necessary uranium fuel. (UPI Photo/Mohammad Kheirkhah) | License Photo