The head of the UN atomic agency called Monday on Iran to grant access to a military base where Tehran allegedly conducted nuclear weapons research, without waiting for an elusive wider accord.
"I request Iran once again to provide access to the Parchin site without further delay, whether or not agreement has been reached on the structured approach," Yukiya Amano told an International Atomic Energy Agency board of governors meeting.
"Providing access to the Parchin site would be a positive step which would help to demonstrate Iran's willingness to engage with the Agency on the substance of our concerns," he said, according to the text of his remarks at the closed-door gathering.
Iran has refused to give the IAEA access to places, documents and scientists involved in what the agency suspects were efforts, mostly in the past but possibly ongoing, to develop nuclear weapons.
More than a year of meetings, the latest on February 13 in Tehran, have failed to agree on a so-called "structured approach" deal to address all the allegations, which were summarised in a major IAEA report in November 2011.
Amano said Monday that "negotiations must proceed with a sense of urgency" and that he "would like to report real progress by the next meeting of the next (IAEA) board meeting in June."
Tehran says that the IAEA's conclusions about the "possible military dimensions" of its programme are based on flawed information from Western and Israeli spy agencies, information that it says it has not been allowed to see.
It denies working or ever having worked on nuclear weapons and says that no nuclear activities have taken place at the Parchin military base near Tehran and that therefore the IAEA has no right to conduct inspections there.
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The IAEA visited the site twice in 2005 but says that since then it has obtained additional indications of activity there that make it want to go back. It has also noted construction work at Parchin that it says would "significantly hamper" its inspection work.
The agency also conducts regular inspections of Iran's declared nuclear sites and its quarterly reports routinely outline advances in its atomic programme in spite of UN Security Council resolutions calling for a suspension. The latest report, issued last month, was no exception.
Western powers were however expected to refrain from seeking a resolution from the 35-nation IAEA board at this week's meeting condemning Iran so as not to jeapordize parallel diplomatic efforts by six world powers.
Talks last week in Kazakhstan last week saw the P5+1 -- the US, China, Russia, Britain, France and Germany -- sweeten an offer made to Iran last year, scaling back some of their demands and offering more relief from sanctions.
Technical experts from both sides are meant to begin thrashing out the details on March 17-18 in Istanbul before chief negotiators return to Almaty on April 5-6 and Iran in particular has expressed optimism about the process.
Western countries were meanwhile hoping that in the closed-door meeting, scheduled to last four days, the IAEA board would approve Amano being given a second four-year term.
The 65-year-old Japanese is the only candidate but formal board approval might be delayed until June or even September -- his current term runs to December -- if any countries have misgivings.
US diplomatic cables from 2009 published by WikiLeaks said Amano was "solidly in the US court on every key strategic decision" and "DG of all states, but in agreement with us."
This irked some countries who feared Amano was a US stooge, as did his decision to publish his November 2011 report on Iran's suspected weaponisation work.