Even prior to the November 23 distribution by the IAEA to its member states of its periodic report on Iran, much was heard heralding the fact that the Iranians were grappling with complications in operating their gas centrifuge uranium enrichment plant at Natanz.

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"The Secretariat of the Agency received a letter from the Atomic Energy Organization of Iran (AEOI) dated 23 January 2013 informing the Agency that 'centrifuge machines type IR2m will be used in Unit A-22' at the Fuel Enrichment Plant (FEP) at Natanz, " the IAEA communication is reported to say.

BBC: Natanz uranium enrichment plant