In a letter dated Jan. 23, Iran notified the UN nuclear agency that it intends to install new IR2m centrifuges at the Natanz plant to upgrade uranium enrichment from five to 20 percent. This would make it possible to  refine uranium faster that it can at the moment. DEBKAfile: This is Tehran’s defiant answer to the rumors that the main high-grade uranium enrichment facility at Fordo was sabotaged. The UN agency backed up Iran’s denial of this report, which means that Iran is now producing near-weapons grade uranium at two plants and and doubling its momentum toward a stock of weapons-grade material.