依照核协议，伊朗在纳坦兹(Natanz)只能设置约5000部第一代IR-1离心机，来累积浓缩铀，另外，只允伊朗使用少量更先进机型作研究，但不生产浓缩铀。
Under the atomic accord, Iran is limited to operating around 5,000 older IR-1 centrifuges at Natanz (Natanz) to accumulate uranium, and is only allowed to use a small number of more advanced models for research, not to produce enriched uranium.