Cannot have fissionable material in a fixed source run

User Support
1

hello,
I want to use uranium 235 in the fixed source, but it gives this message (Can not fissionable material-have in a fixed source run) .
HOW WE CAN SOLVE THIS PROBLEM
thank you

2

This capability was added in version 0.6.2:
http://mit-crpg.github.io/openmc/releasenotes/notes_0.6.2.html

Note that currently in fixed source problems, fission is just treated as absorption, i.e. no fission neutrons are created.

Best regards,
Paul