11 Supporting international medicine In 2015 INLs one-of-a-kind ATR took on an experiment containing the largest amount of fissile material ever irradiated there. The results will support licensing and startup of a vital new South Korean reactor capability which will be used for medical isotope production. The Ki-Jang Research Reactor KJRR will be the first reactor designed around the proliferation-resistant low-enriched uranium fuel in support of medical isotope production. Before inserting the experiment INL engineers used a new software suite consisting of the HELIOS and MCNP codes to upgrade the reactors Core Safety Assurance Package. These technicians are preparing the KJRR experiment for insertion in the reactor.