UN Security Council
2015

scope and scale of Iran’s enrichment and enrichment R&D activities are in line with this plan. 53. Iran will start to install necessary infrastructure for the IR -8 at Natanz in Hall B of FEP after year 10. 54. An agreed template for describing different centrifuge types (IR -1, IR-2m, IR-4, IR-5, IR-6, IR-6s, IR-7, IR-8) and the associated definitions need to be accomplished by implementation day. 55. An agreed procedure for measuring IR-1, IR-2m and IR-4 centrifuge performance data needs to be accomplished by implementation day. J. URANIUM STOCKS AND FUELS 56. Iran will maintain a total enriched uranium stockpile of no more than 300 kg of up to 3.67% enriched uranium hexafluoride (or the equivalent in different chemical forms) for 15 years. 57. All enriched uranium hexafluoride in excess of 300 kg of up to 3.67% enriched UF6 (or the equivalent in different chemical forms) will be down blended to natural uranium level or be sold on the international market and delivered to the international buyer in return for natural uranium d elivered to __________________