Failed to open HDF5 files

[Dalia]

Thank you a lot I fixed it using this post:

Cylindrical geometry, More than 95% of external source sites sampled were rejected

Rather than start a new topic, I have a related question to this one - but it is much simpler. I want to compute keff for a hollow cylinder. This is to prepare a criticality safety table. I created a hollow cylinder like so: Instantiate Surfaces B1 = openmc.ZPlane(surface_id=1, z0= 0, name=‘B1’) B2 = openmc.ZPlane(surface_id=2, z0= 14, name=‘B2’) R1 = openmc.ZCylinder(surface_id=11, x0=0, y0=0, r=5.0, name=‘R1’) R2 = openmc.ZCylinder(surface_id=12, x0=0, y0=0, r=7.0, name=‘R2’) B1.bound…

Thank you really for your help!