INL National University Consortium – Annual Report 9 UNM Works to Develop Real-Time Measurement of TREAT Core As part of an INL LDRD project with Nicolas Woolstenhulme, University of New Mexico researchers Youho Lee, Patrick McDaniel and Nima Fathi focused on designing an advanced detector to measure the radiation fields in INL’s Transient Reactor Test (TREAT) Facility. If successful, this detector will provide near real-time measurement of the neutron flux environment at any point in the TREAT core. TREAT is a test facility specifically designed to evaluate the response of reactor fuels and structural materials to accident conditions. The reactor was originally constructed to test fast-reactor fuels, but its flexible design has also enabled its use for testing of light-water-reactor fuels and other exotic special-purpose fuels, such as space reactors. TREAT was placed on standby in 1994. Operations were resumed in 2018. Laboratory-directed Research and Development INL workers guide a test capsule into the reactor for the first fueled experiment in TREAT facility in more than two decades.