The Nuclear Science Research Institute (NSRI) has various research facilities for nuclear science and technology, such as research reactors, accelerators and facilities for radioisotopes and nuclear fuel materials handling. Using these facilities, research and development are made in the areas of advanced basic science, basic nuclear science and engineering, nuclear safety, quantum beam science, computational science, backend technology, etc. Based on these activities and experiences, research and development are also made towards the decommissioning of the Fukushima Daiichi Nuclear Power Plants, the cores of which melted down following the Great East Japan Earthquake and tsunamis on March 11, 2011. NSRI also functions as a training center for experts, who are both Japanese and foreigners, and as a base for collaboration with industries and universities. Furthermore, the Japan Proton Accelerator Research Complex (J-PARC), jointly managed by JAEA and the High Energy Accelerator Research Organization (KEK), is co-located in the site.