50:T43a,According to the report, Iran has improved its uranium enrichment capabilities and strives to attain a higher enrichment level. "ISIS has learned that Iran is now using the second cascade at the Pilot Fuel Enrichment Plant (PFEP) at Natanz to recycle the tails from the first cascade that produces 19.75 percent enriched uranium from 3.5 percent low enriched uranium (LEU)." The report explained that the move to recycle the tails in the second cascade, "is not to increase the output of 19.75 percent material but to maximize the use of the 3.5 percent low enriched uranium (LEU)."
RELATED:Panetta: Iran has uranium for 2 bombs 'Iran amassing enriched uranium'Iran agrees to ship most of its enriched uranium to Turkey51:T57a,According to the ISIS, the "second cascade" recycling process enables Teheran to minimize "wasting separative work units (swu) in the enrichment process and ultimately requires less 3.5 percent LEU to produce a given quantity of 19.75 percent material." The ISIS reported that Iran is not limited in its amount of 3.5 percent material to produce "research reactor fuel and will not be anytime soon." As a result, there is no need for Iran "to worry about using its tails efficiently," explained the organization.

However, the ISIS stated that Teheran is "expected to use the same type of procedure to reduce the amount of separative work left in the tails" if it will decide to enrich uranium to the level of weapon-grade. The process "stepwise increases the enrichment level of t

Report: Iran enrichment more efficient

US based ISIS explains Teheran's improvement in uranium enrichment.