  Abundances and energy spectra of cosmic ray nuclei are being measured with
high accuracy by the AMS experiment. These observations can provide tight
constraints to the propagation models of galactic cosmic rays. In the view of
the release of these data, I present an evaluation of the model uncertainties
associated to the cross-sections for secondary production of Li-Be-B nuclei in
cosmic rays. I discuss the role of cross section uncertainties in the
calculation of the boron-to-carbon and beryllium-to-boron ratios, as well as
their impact in the determination of the cosmic-ray transport parameters.
