Hi everyone,
I would like to determine the gamma energy deposition in an MSRE model that includes a heat exchanger, pump, and various tubes. I believe the fixed source mode is appropriate for this analysis. Since the photons are emitted from the fuel, it is essential to designate all areas of the fuel as the source region. However, there are numerous fuel channels within the core, which makes this task challenging. What would be the easiest way to set the fuel regions as the source region?