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The secondary-to-primary B/C ratio is widely used to study the cosmic ray(CR) propagation processes in the Galaxy. It is usually assumed that secondarynuclei such as Li-Be-B are entirely generated by collisions of heavier CRnuclei with the interstellar medium (ISM). We study the CR propagation under ascenario where secondary nuclei can also be produced or accelerated fromgalactic sources. We consider the processes of hadronic interactions insidesupernova remnants (SNRs) and re-acceleration of background CRs in strongshocks. Thus, we investigate their impact in the propagation parameterdetermination within present and future data. The spectra of Li-Be-B nucleiemitted from SNRs are harder than those due to CR collisions with the ISM. Thesecondary-to-primary ratios flatten significantly at ~TeV/n energies, both fromspallation and re-acceleration in the sources. The two mechanisms arecomplementary to each other and depend on the properties of the local ISMaround the expanding remnants. The secondary production in SNRs is significantfor dense background media, n ~1 cm^-3, while the amount of re-accelerated CRsis relevant for SNRs expanding into rarefied media, n ~0.1 cm-3. Due to theseeffects, the the diffusion parameter 'delta' may be misunderstood by a factorof ~5-15%. Our estimations indicate that an experiment of the AMS-02 calibercan constrain the key propagation parameters while breaking thesource-transport degeneracy, for a wide class of B/C-consistent models. Giventhe precision of the data expected from on-going experiments, the SNRproduction/acceleration of secondary nuclei should be considered, if any, toprevent a possible mis-determination of the CR transport parameters.

Secondary Cosmic Ray Nuclei from Supernova Remnants and Constraints to the Propagation Parameters