  The cluster reduction method for the Yakubovsky equations in configuration
space is used for calculations of zero-energy scattering in four-nucleon
system. The main idea of the method consists in making use of expansions for
the Yakubovsky amplitudes onto the basis of the Faddeev components for the
two-cluster sub-Hamiltonian eigenfunctions. The expansions reduce the original
equations to ones for the functions depending on the relative coordinates
between the clusters. On the basis of the resulting equations the N-(NNN)
zero-energy scattering problems are solved numerically with the MT I-III model
for N-N forces and neglecting the Coulomb interaction between protons.
