Hi everyone
I’m simulating the impact of moderator temperature on reactor core reactivity using MCNP5. I generated thermal cross sections for light water at 293 K and 350 K using openmc.data.njoy . However, when running MCNP5 with these cross sections, I encounter the error:
bad trouble in subroutine sread of xact error in hh2o.02t of cross-section file lwtr.00t
This error doesn’t occur when using thermal scattering cross sections generated for 293 k.
The python lines I used to generate the cross sections are:
openmc.data.njoy.make_ace_thermal(‘neutrons/n-001_H_001.endf’,
‘thermal_scatt/tsl-HinH2O.endf’,
ace=‘lwtr.00t’,
xsdir=‘ace_th/lwtr_xsdir’,
output_dir=‘ace_th’,
iwt=0,
stdout=True)
Has anyone encountered this error before with thermal cross sections at elevated temperatures?
Could there be temperature-dependent data issues in the ENDF files at 350 K?
Any suggestions for further troubleshooting or alternative approaches?