Geometry debug mode

I ran a reactor model with a geometry-debug flag. I managed to get rid of the overlapping cells. The run finished (it was an eigenvalue calculation). However, I don’t understand the report. After the TIMING STATISTICS and the RESULTS there is the CELL OVERLAP CHECK SUMMARY section. I have several questions regarding this report:

  1. Next to each cell ID there is a No. Overlap Checks. What do these numbers mean?
  2. After this table, I see the following lines:
    There were 0 cells with less than 10 overlap checks

Abort(811170063): Fatal error in internal_Finalize: Other MPI error, error stack:
internal_Finalize(50)…: MPI_Finalize failed
MPII_Finalize(400)…:
MPID_Finalize(652)…:
MPIDI_OFI_mpi_finalize_hook(830):
flush_send_queue(780)…:
(unknown)(): Other MPI error

What do these lines mean?