  We calculate S-wave singlet and triplet NN phase shifts stemming from the
short-range flavor-spin hyperfine interaction between constituent quarks using
the resonating group method approach. A strong short-range repulsion is found
in both waves. A fair comparison is performed between the traditional picture,
relying on the colour-magnetic interaction, and the present one, relying on the
Goldstone boson exchange dynamics. It is shown that the latter one induces
essentially stronger repulsion, which is a very welcome feature. We also study
a sensitivity of phase shifts and wave function to extention from the
one-channel to three-channel resonating group method approximation.
