Hi all. I’m new to OpenMC. I’m trying to run a depletion simulation every 30 days until I have modeled the problem over a 24-month cycle (EFPD). I got the error “No fission sites banked on MPI rank 0”.

I think it is because of the warning about density but I don’t know what to do. Could you all please help me to solve this?
This is my script. I have modeled SMR core with three types of fuel enrichment. 6.py (16.5 KB)

Computing the volume of these is pi*(R)^2 * h(height) * the number of all the fuel rods*the number of assemblies in the core, isn’t it? Could you please clarify this?