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Recent experimental results for neutron-neutron scattering length arereanalyzed from the point of view of three-nucleon force contribution. We foundthat the limiting value of $a_{nn}=- 15.8\pm 0.5$~fm must be free of anyimplicit three-body force contribution. We have also shown that the differencebetween the above experimental value of $a_{nn}$ and the well established valueof neutron-proton scattering length $a_{np}$ can be explained by differences inthe one-pion exchange potentials.

New estimation for neutron-neutron scattering length: charge symmetry and charge independence breaking revisited