A nuclear reactor designed mainly for generation of high neutron intensities for research purposes. May also be used for training, material testing and generation of radionuclides. As of October 2014, the International Atomic Agency’s Research Reactor Database
nucleus.iaea.org/RRDB/RR/ReactorSearch.aspx?filter=0 contains information on research reactors, of which 247 are operational, 143 are shutdown, 338 have been decommissioned, 12 are planned and 6 under construction

Research reactors in operation, IAEA, October 2014

Age distribution of research reactors, IAEA, October 2014