  Nuclear energy released by splitting Uranium and Thorium isotopes into two,
three, four, up to eight fragments with nearly equal size are studied. We found
that the energy released come from equally splitting the $^{235,238}$U and
$^{230,232}$Th nuclei into to three fragments is largest. The statistical
multifragmentation model is employed to calculate the probability of different
breakup channels for the excited nuclei. Weighing the the probability
distributions of fragments multiplicity at different excitation energies for
the $^{238}$U nucleus, we found that an excitation energy between 1.2 and 2
MeV/u is optimal for the $^{235}$U, $^{238}$U, $^{230}$Th and $^{232}$Th nuclei
to release nuclear energy of about 0.7-0.75 MeV/u.
