According to the director of the the Kurchatov Center, the date of the start-up of the PIK high-flux research reactor will be determined at the end of 2013, when the Institute of Nuclear Physics in Gatchina, near St.-Petersburg completes construction of the first line of the research facility. The reactor first went critical in February 2011, but the start of operations at full power has been delayed several times.
UPDATE 04/22/2013: Nuclear.ru quotes Kurchatov officials as saying that the start-up of the reactor could take "several years." It is expected that the full start-up will not take place until 2015.
UPDATE 08/17/2017: It appears that the reactor is being prepared for full-power start-up at the end of 2018.