  The general scheme of power installations based on nuclear reactions of
fission and synthesis activated by external sources is analyzed. The external
activation makes possible to support nuclear reactions at temperatures and
pressures lower than needed for chain reactions, so simplifies considerably
practical realization of power installations. The possibility of operation on
subcritical masses allows making installations compact and safe at emergency
situations. Installations are suitable for transmutation of radioactive
nuclides, what solves the problem of utilization of nuclear waste products. It
is proposed and considered schemes of power installations based on nuclear
reactions of fission and fusion, activated by external sources, different from
ADS systems. Variants of activation of nuclear reactions of fission (U-235,
238, Pu-239) and fusion (Li-6,7, B-10,11) are considered.
