# Could not find nuclide U235

**URL:** <https://openmc.discourse.group/t/could-not-find-nuclide-u235/2410>\
**Category:** User Support\
**Created:** [October 30, 2022, 12:36pm UTC](https://openmc.discourse.group/t/could-not-find-nuclide-u235/2410 "2022-10-30T12:36:18Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![Shimwell](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/shimwell/32/3876_2.png) [@Shimwell](https://openmc.discourse.group/u/Shimwell)\
**Post date:** [October 31, 2022, 10:08am UTC](https://openmc.discourse.group/t/could-not-find-nuclide-u235/2410/8 "2022-10-31T10:08:34Z")

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I’m sure we can get either the official or this downloader working for you. Are you able to attend the monthly drop is session today, we can do a screen share and get things working?

I would be tempted to move uranium and iron to the element section

So you have

‘’’  
openmc\_data\_downloader -l TENDL-2019 -e U Li Na Si Fe  
‘’’

Then export the environmental variable.

‘’’  
export OPENMC\_CROSS\_SECTIONS=home/dalia/cross\_sections.xml  
‘’’

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