Another advantage for hybrid reactors could be related to the
ability to produce abundant tritium to fuel the hybrid, as well as
other fusion power plants. A recent analysis of the tritium fuel cycle
of controlled thermonuclear reactors [14] asserts that the need for
(n, 2n) reactions to maintain a favorable neutron balance makes
the availability of beryllium the limiting factor in the expansion
of a pure fusion power economy. As expected, in our neutronic
design studies we found that the tritium breeding ratio (TBR) was
in competition with the actinide destruction rate. For an isolated
In-Zinerator system our target TBR was conservatively set at 1.2.
However, the neutronmultiplication in a hybrid blanket could allow
a higher TBR if required to help provide fuel for additional pure
fusion reactors.