Keyword:USEXSEXTRA

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USEXSEXTRA


The USEXSEXTRA keyword instructs the collapse step to use the cross section data from the xs_extra stream in preference to data in the xs_endf stream. It is only implemented in the read library keywords phase and so cannot be changed for subsequent collapses in the inventory phase. The keyword has no effect for EAF data.

Typically, this keyword is used to extract data that has already been spliced using the USESPALLATION keyword. USEXSEXTRA requires that the stream xs_extra is defined in the files file, otherwise a fatal error message will be issued.

To add the xs_extra stream add the lines to the files file:

# Extra cross section data
xs_extra ./xs_extra

where the second argument is the path to the directory containing the replacement cross section files.