ran has doubled its capacity at a tough-to-bomb nuclear facility, a U.N. atomic agency report showed Thursday, as Supreme Leader Ayatollah Ali Khamenei told a summit of the Non-Aligned Movement in Tehran that his country "is never seeking nuclear weapons."
The International Atomic Energy Agency also said that its ability to inspect the Parchin military base where it suspects nuclear weapons research took place in the past had been "significantly hampered" by a suspected clean-up.
The IAEA said it was still "unable to provide credible assurance about the absence of undeclared nuclear material and activities in Iran, and therefore to conclude that all nuclear material in Iran is in peaceful activities."
The report, circulated to IAEA member states and seen by AFP but not published, showed that Iran now has around 2,000 uranium-enrichment centrifuges installed, compared with around 1,000 in May, at Fordo.
Enriched uranium can be used for peaceful purposes but also, at highly concentrated purities, for nuclear weapons, and multiple UN Security Council resolutions have called on Iran to suspend enrichment.
Meanwhile, Iran's supreme leader Khamenei told the NAM summit in Tehran on Thursday that his country "is never seeking nuclear weapons" and would "never give up the right to peaceful nuclear energy."
Khamenei also slammed the "overt dictatorship" of the U.N. Security Council in a speech opening the NAM summit that included U.N. chief Ban Ki-moon in the audience.
"The U.N. Security Council has an irrational, unjust and utterly undemocratic structure, and this is an overt dictatorship," Khamenei told the 120-member Non-Aligned Movement summit.
"I insist that the Islamic Republic of Iran is never seeking nuclear weapons," Khamenei said, rebutting Western and Israeli suspicions his country was engaged in pursuing such a goal.
He called the use of nuclear weapons and other weapons of mass destruction "a major and unforgiveable sin."
Addressing Western economic sanctions designed to pressure Iran on the nuclear issue, he said: "Sanctions -- which those who babble call 'paralyzing' -- not only do not and will not paralyze us, but have made our steps steadier and elevated our resolve and boosted our confidence in our assessments."
Fordo is dug into a mountain near the holy city of Qom and mostly enriches to 20 percent purities, technically speaking a short hop from the 90-percent needed in a nuclear weapon.
Only around 700 centrifuges are operating at Fordo, however, and monthly production is unchanged at around 15 kilos of 20-percent uranium per month. It is also unclear whether the newly installed machines will also enrich to 20 percent.
A senior official familiar with the IAEA investigation said on condition of anonymity that it was unclear whether technical problems were behind the reason that no more centrifuges were operational.
Iran's stated reason for enriching to 20 percent is for fuel for a medical research reactor in Tehran, but the official said that it "now has enough fuel for more than 10 years."
The IAEA also wants Iran to address what it believes is evidence that until 2003, and possibly since, Tehran had a structured program of research into nuclear weapons.
Iran has flatly rejected these claims, set out in a major IAEA report last November, and says it will only give the agency the desired access as part of a broader agreement governing its future relations with the watchdog.
In particular the IAEA wants to be able to visit the Parchin military base near Tehran where it believes Iran conducted explosives tests for nuclear warhead designs.
Western nations accuse Tehran of "sanitizing" the site to remove evidence and in the new report the IAEA said that Iran "has been conducting activities at that location that will significantly hamper the Agency's ability to conduct effective verification."
Citing satellite images, these activities included the demolition of certain buildings, "significant ground scraping and landscaping" over an extensive area and the "shrouding" of buildings, the IAEA said.
The latest in a series of meetings aimed at persuading Iran to give the IAEA access to documents, scientists and sites involved in this alleged drive to get the bomb failed last Friday.
A separate, higher-level renewed diplomatic push in talks between Iran and the "P5+1" five permanent members of the U.N. Security Council -- the U.S., China, Russia, France and Britain -- plus Germany appears stalled, meanwhile.
After their first meeting in 14 months in Istanbul in April, further talks were held in Baghdad in May and then in Moscow in June, where they were however downgraded to lower-level discussions.
Fresh talks between the P5+1 chief negotiator, EU foreign policy chief Catherine Ashton, and Iranian counterpart Saeed Jalili would happen "in the coming days," Ashton's spokesman said in Brussels on Thursday.
He did not say whether these talks would be face-to-face.
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