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. Iran blocked UN inspectors on test visit to nuclear site
VIENNA, May 11 (AFP) May 11, 2007
Iran has blocked UN atomic experts on a first unannounced test inspection of an underground nuclear site where it enriches uranium, despite a pledge to allow such visits, diplomats told AFP.

The watchdog International Atomic Energy Agency had in March told Iran to allow its inspectors to install surveillance cameras at the site in Natanz that is heavily bunkered against possible air strikes, but Tehran refused this and in return agreed to allow frequent, unannounced visits.

A first test on April 21 of the agreement "was a total failure," a diplomat in Vienna, home to the IAEA, said Thursday, adding that a successful unannounced inspection has not yet taken place.

At stake is Iranian compliance with inspections by the IAEA, the verification arm of the nuclear Non-Proliferation Treaty, the world's basic agreement against the spread of atomic weapons.

Iran is defying UN demands for it to stop enriching uranium, which makes fuel for civilian nuclear power reactors but can also produce the explosive core of atom bombs.

The UN Security Council has imposed two rounds of limited sanctions on Iran because of this defiance and due to fears it is using what it says is a peaceful program to hide the development of nuclear weapons.

The IAEA is to report to the Council on May 23 on Iran's nuclear activities, and then meet on the matter in June.

A negative IAEA report could lead to a third round of sanctions against Iran.

"The Iranians did not let the IAEA inspectors into the halls where the cascades of centrifuges are," the diplomat said about inspections at Natanz, referring to the production lines of centrifuges which enrich uranium.

"So they couldn't get details of what is going on there," the diplomat said.

"An undeclared visit should be fast, uncomplicated but the Iranians said they wanted to talk again about the terms of the visits."

Problems with inspections were confirmed by two other envoys in Vienna.

Iranian and IAEA officials refused to comment.

Another diplomat said the IAEA has made regular visits since then to the Natanz site, but not into the cascade hall and not unannounced inspections, and may try another surprise visit soon.

A source close to the Iranians said they were still trying to determine how to arrange unannounced visits.

Western diplomats have charged that Iran has a history of stalling on IAEA inspections.

The IAEA had reported in April that Iran has assembled some 1,300 centrifuges Natanz in central Iran.

A diplomat said there were now over 1,600 centrifuges functioning there, arrayed in 10 cascades of 164-centrifuges each.

Each cascade is being fed with the uranium gas needed for enrichment.

But the diplomat said the cascades were working "in slow motion" as the Iranians are afraid that setting them at top speed would cause them to break down.

"The Iranians are working at having a large number of centrifuges running, rather than how efficient the process is," the diplomat said.

The diplomat said the Iranians were adding about one cascade of 164 centrifuges every 10 days.

Iranian President Mahmoud Ahmadinejad had announced in April that the Iran's uranium enrichment work had reached an "industrial scale," a stage that requires at least 3,000 centrifuges, but did not say how many centrifuges were working.

Iran wants eventually to have over 50,000 centrifuges in Natanz, which would be enough to make some 20 atomic bombs a year.

IAEA chief Mohamed ElBaradei said in February that cameras would be needed inside the cascade halls, and not outside as is already permitted, if Iran were running more than 500 centrifuges underground at Natanz in order to properly monitor the nuclear work.

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