Library claims to not contain xs near required temperature

User Support
1

We recently installed OpenMC (0.11.0-dev) on a new system with the lib80x library. When testing the installation, I receive the following error when running the model:

ERROR: Nuclear data library does not contain cross sections for H1 at or near 283.000000 K.

Now this seems strange because it would be odd for the library to not contain H1 near room temperature. Sure enough, loading the H1.h5 into an IncidentNeutron, I can confirm there is good coverage for interpolation to 283 K.

h1 = openmc.data.IncidentNeutron.from_hdf5(‘./lib80x_hdf5/H1.h5’)

h1.temperatures

[‘0K’, ‘1200K’, ‘2500K’, ‘250K’, ‘294K’, ‘600K’, ‘900K’]

I feel like I’m making an obvious mistake somewhere. Please let me know if you’ve come across this before.

Thanks,

Sourena

2

I forgot to update this earlier, but it turns out this was indeed an obvious mistake. The previous installation was from way back in 0.8.0, before temperature interpolation was implemented. For the sake of posterity, this problem is fixed by adding to the settings: