"This would be a major miscalculation and mistake by the Iranian government," US Undersecretary of State Nicholas Burns said. "If Iran takes this step, it is going to confront universal international opposition.

"And if they think that they can get away with 3,000 centrifuges without another Security Council resolution and additional international pressure then they're very badly mistaken," Burns said.

In December, the UN Security Council passed 15-0 a resolution imposing sanctions on Iran for its repeated refusal to cooperate fully with the International Atomic Energy Agency (IAEA), the UN atomic energy watchdog, or to suspend uranium enrichment.

"They've already had China and Russia and all of the European countries and the United States oppose them. They've also had India and Egypt and Brazil oppose them a year ago at the IAEA Board of Governors," Burns said.

Another defiant move would "solidify the international opposition to Iran," he said, emphasizing again "it's a miscalculation."

An Iranian government spokesman said earlier this month that Iran would be making a major announcement on the "completion" of Iran's nuclear program during the 10-day anniversary celebrations for the Islamic revolution in February. He did not go into details.

The Islamic republic has so far declared the installation of two cascades of 164 centrifuges at the plant in Natanz and the installation of 3,000 centrifuges would mark a major step towards industrial enrichment.

The machinery is used to enrich uranium, a highly sensitive process that can be used both to make nuclear energy and a nuclear bomb.

It has so far shown no sign of caving into the Security Council resolution that imposed the first ever UN sanctions against Iran over its failure to suspend enrichment.

Iran, which insists that its nuclear program is entirely peaceful, this week banned 38 IAEA inspectors from working in the country.

It also sought removal of the official overseeing the IAEA's inspection of the Iranian nuclear program.

"It's outrageous," said State Department spokesman Sean McCormack. "They're inspector shopping."

He said that "the tone of those kinds of actions are indicative of their continued defiance.

"And this is not what the international system is looking for or, frankly, what it was hoping for in terms of Iranian behavior."

IAEA chief Mohamed ElBaradei is to report to the UN Security Council by February 21 on whether Iran has suspended enrichment.

If it has not, sanctions could be tightened and there is increased speculation that either the United States or Israel could eventually decide to bomb Iran in order to stop it from making nuclear weapons.

related report
Iran prepared for nuclear issue solution without preconditions
Tehran (RIA Novosti) Jan 29 - Tehran is prepared for negotiations on the Iran nuclear issue without preconditions, Iranian Foreign Ministry spokesman Mohammad Ali Hosseini said Sunday.

Hosseini said Iran still keeps the doors open for negotiations and is prepared for these negotiations to resume but without any preconditions. Hosseini said international pressure will not force Tehran to give up its civilian nuclear technologies.

Iran has been at the center of international concerns since January 2006 over its nuclear program, which some countries suspect is geared toward nuclear weapons development.

Tehran has consistently denied the claims, and says it needs nuclear power for civilian purposes. The UN Security Council unanimously adopted Resolution 1737 on Iran December 23, which imposed sanctions on the country's nuclear weapons programs but allowed officials to make foreign trips and companies to do business abroad.

The sanctions banned activities involving uranium enrichment, chemical reprocessing, heavy water-based projects, and production of means for nuclear weapons delivery. Hosseini said Tehran welcomes any proposal [on the Iran nuclear issue], which will secure the Islamic Republic's right to civilian nuclear technologies within the framework of the Nuclear Non-Proliferation Treaty.

Hosseini also said Iran will continue cooperation with the UN nuclear watchdog, despite its recent refusal to admit 38 inspectors from the International Atomic Energy Agency.

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