uranium has been fabricated into fuel, no additional uranium has been sent to the Fuel Plate Fabrication Plant at Isfahan. The November report noted that Iran has continued to deny the IAEA access to the military site at Parchin. Citing evidence from satellite imagery that "Iran constructed a large explosives containment vessel in which to conduct hydrodynamic experiments" relevant to nuclear weapons development, the report expresses concern that changes taking place at the Parchin military site might eliminate evidence of past nuclear activities, noting that there had been virtually no activity at that location between February 2005 and the time the IAEA requested access. Those changes include: Frequent presence of equipment, trucks and personnel. Large amounts of liquid run-off. Removal of external pipework. Razing and removal of five other buildings or structures and the site perimeter fence. Reconfiguration of electrical and water supply. Shrouding of the containment vessel building. Scraping and removal of large quantities of earth and the depositing of new earth in its place. Iran said that the IR-40 heavy water research reactor at Arak was expected begin to operate in the first quarter of 2014. During on-site inspections of the IR-40 design, IAEA inspectors observed that the installation of cooling and moderator circuit piping was continuing. February 2013 report On 21 February, the IAEA released a report showing continued expansion in Iranian uranium enrichment capabilities. As of 19 February, 12,699 IR-1 centrifuges have been installed at Natanz. This includes the installation of 2,255 centrifuges since the previous IAEA report in November. Fordow, the nuclear facility near Qom, contains 16 cascades, equally divided between Unit 1 and Unit 2, with a total of 2,710 centrifuges. Iran is continuing to operate the four cascades of 174 IR-1 centrifuges each in two tandem sets to produce 19.75 percent LEU in a total of 696 enriching centrifuges, the same number of centrifuges enriching as was reported in November 2012. Iran has produced approximately 280 kg of near-20 percent enriched uranium, an increase of 47 kg since the November 2012 IAEA report and the total 3.5 percent LEU production stands at 8,271 kg (compared to 7,611 kg reported during the last quarter). The IAEA February 2013 report stated that Iran had resumed reconverting near-20 percent enriched uranium into Oxide form to fabricate fuel for the Tehran Research Reactor, which makes it more difficult to further enrich that uranium to weapons grade, since