Hi Paul,
I have ever wanted to look for a mesh style to filter the fission rate of my case, I have defined as a series of concentric cylinders and some planes to cut the model into many cells. and using openmc.CellFilter to record the fission rate.And the simulation is running.
May be the result of openmc.CellFilter will be more suitable for coupling with thermalhydraulic model.(could you give me more advice on this?)
Best regards!
Zhuangli