Dear @guemnietafoa,
I see you have a mixed environment with HomeBrew, MacPorts, and EGSnrc. I think your Python executable isn’t from MacPorts. You can check this with the command which python3.
In this case, I suggest you follow the instructions in this thread: SIGBUS error on first run - #7 by luillo
In particular, steps 1-4.
Let me know.
Best, Luigi