Iran exhibited 133 of its nuclear achievements on April 10 as part of National Nuclear Technology Day. Iranian President Hassan Rouhani ordered the Natanz nuclear facility to begin using 164 Iranian-made IR-6 centrifuges to enrich uranium; IR-6 centrifuges, the most efficient that Iran has currently put into use, have a claimed output of 10 separative work units (SWUs), enabling them to enrich 10 times as much uranium hexafluoride as first-generation IR-1 centrifuges. Additionally, Rouhani ordered Iran to begin tests of 30 IR-5 and 30 IR-6s (an improved variant of the IR-6) centrifuges. Rouhani also oversaw the launch of the second phase of industrial production of deuterium compounds at the Arak Heavy Water Reactor Facility. Separately, the Natanz facility launched a new unit for assembling and evaluating centrifuges and the National Centre for Laser Science and Technology in Iran's Alborz province unveiled unspecified nuclear projects.