Export OPENMC_CROSS_SECTIONS =

User Support
1

Hello OpenMC community,

I’m encountering an issue with configuring the nuclear data library for OpenMC 0.15.0 on Linux and would appreciate your help.

Steps I’ve taken:

  1. Installed OpenMC 0.15.0 via Conda in a dedicated environment (openmc-env).
  2. Downloaded the endf-b-vii.1 nuclear data library from the official OpenMC website.
  3. Extracted the database into the openmc-env/ directory (full path: /anaconda/envs/openmc-env/).
  4. Set the environment variable:
    export OPENMC_CROSS_SECTIONS=“/path/to/openmc-env/nuclear_data/cross_sections.xml”
    Verified the path with echo
    $OPENMC_CROSS_SECTIONS, which returns the correct path.

I think that i unzipping the database to the wrong location?

2

yes, try ls /path/to/openmc-env/nuclear_data/ and if you don’t see a cross_section.xml file, you path is incorrect.

3

(openmc-env) a1@LAPTOP-HBQ9I19M:/mnt/c/Users/Hai/PyCharmMiscProject$ ls /home/a1/anaconda3/envs/openmc-env/endfb-vii.1-hdf5/cross_sections.xml
/home/a1/anaconda3/envs/openmc-env/endfb-vii.1-hdf5/cross_sections.xml
(openmc-env) a1@LAPTOP-HBQ9I19M:/mnt/c/Users/Hai/PyCharmMiscProject$ export OPENMC_CROSS_SECTIONS=“home/a1/
anaconda3/envs/openmc-env/endfb-vii.1-hdf5/cross_sections.xml”
(openmc-env) a1@LAPTOP-HBQ9I19M:/mnt/c/Users/Hai/PyCharmMiscProject$ echo $OPENMC_CROSS_SECTIONS
home/a1/anaconda3/envs/openmc-env/endfb-vii.1-hdf5/cross_sections.xml

why it cannot run? :sob:

4

Hi Limitless,
Just to make sure, what is the error message shown when you do the openmc run?

Also, I recommend you move your endfb-vii.1-hdf5 folder (neutron, photon, cross sections.xml, etc) to your home/a1. You can create a new folder to make it more organized and so that your data lib is not that deep within the conda environment.