Could not find S(a,b) table lwtr.15t in cross_sections.xml file!

User Support
1

hi,
i have this error when i want to run the test pincell
Reading settings XML file…
Reading cross sections XML file…
Reading geometry XML file…
Reading materials XML file…
ERROR: Could not find S(a,b) table lwtr.15t in cross_sections.xml file!
ERROR STOP
[islamway@islamway pincell]$
regards

2

Hi Othman,
If you are working with nndc cross sections at 293K all the neutron xs tables have a suffix 71c. Some examples provided with OpenMC may still use the suffix of MCNPDATA and need to be change.
The same issue is applicable to your second question about S(a,b) of water: lwtr.10t is an MCNPDATA file processed at 293K; it needs to be replaced by HH2O.71t. But lwtr.15t is processed at 550K and is not provided by nndc.

Prof. Tarek El Bardouni
University Abdelmalek Essaadi,
Tetouan 93030, Morocco