The International Atomic Energy Agency reports that Iran's stockpile of 20 percent enriched uranium slightly increased to 196 kilograms and that Iran has installed four additional first-generation IR-1 centrifuges at its Natanz plant since August.  The IAEA also reports Iran has not installed any additional advanced centrifuges and that no major components have been added to the heavy water reactor at Arak, which is currently under construction.