I'm working on the MSFR design and want to calculate keff. I'm trying to use the MNCPX VisEd program included with MCNP 6.1 to create my geometry. The reactor I'm designing doesn't contain fuel rods or moderator structures. The molten salt fuel circulates within the cylindrical reactor core.
I'm having problems creating the geometry using MNCPX VisEd. VisEd allows for easy drawing of nested sphere, cylinder, or rectangular prism cells. However, when you want to draw a torus section within...