Abstract
The design of the IVG.1M research reactor provides the possibility for long-term irradiation of small samples (60/160 mm) in the upper part of the water-cooled technological channels. The placement of samples in these positions ensures low heat generation and does not affect significantly the reactor’s reactivity. However, this capability has not been utilized. The conversion of the reactor to low-enriched uranium fuel resulted in an increased reactivity margin, making the use of additional irradiation positions of interest for expanding the reactor’s experimental capabilities. To justify this possibility, neutron-physical characterization of these positions must be performed using computational modeling. The existing reactor model is limited to the core and does not include structural components located above it. This work is devoted to extending the computational model of the IVG.1M reactor and evaluating the neutron-physical characteristics of the additional irradiation positions.