Gwendolyn,
After a good bit of discussion, Paul and I have merged a fix into the develop branch that should help this issue: https://github.com/openmc-dev/openmc/pull/1593
By changing the value of “openmc.deplete.pool.USE_MULTIPROCESSING” to False, the depletion will be done without multiprocessing and therefore not hang on BlueWaters or similar HPCs. Thank you for bringing this to our attention and providing us with extremely helpful information.
Regards,
Drew