mcnp2cad
UW has a tool, mcnp2cad, which can translate a MCNP model into ACIS format for use in future DAGMC simulations. The tool builds CAD solids from MCNP cell descriptions often turning infinite bodies and planes into finite versions. This tool has been integrated into Coreform Cubit, and can be executed under the File -> Import... menu option by selecting the MCNP file type.
Executing this command will generate the MCNP model in the Coreform Cubit session with material and cell importance assignment metadata included for addition to the resulting DAGMC file upon export.