Cross Section not found in certain file

[andrewjohnson]

Can you try setting the OPENMC_CROSS_SECTION environment variable? This thread has a similar issue and (possible) solution

Issue in a depletion analysis

Hi all I am having an issue in a depletion analysis. I created a library from random ENDF files (taken from TENDL). When I run the model without the depletion, it works perfectly. However, when I include the depletion part, I get the error “No cross_sections.xml specified in materials”, although the path to the cross sections is explicitly indicated in materials.xml. https://drive.google.com/drive/folders/1U56PEHJAEr2N3GoDRtgGrrPDMq7qEYKP?usp=sharing Any idea why this is happening? Thanks, …

Issue in a depletion analysis

Hmm, yes I see now that using settings.xml won’t work. Here’s another idea — try setting the OPENMC_CROSS_SECTIONS environment variable from the Python script: import os os.environ['OPENMC_CROSS_SECTIONS'] = 'Data000/cross_sections.xml' The Operator class relies on that when it is instantiated, so if you want to run a bunch of depletion simulations from the same script, you’ll have to change os.environ and create a new instance of Operator each time.