99.282% U238, 0.712% U235, 0.006% U234

99.282% U235, 0.712% U238, 0.06%′ U234

99.282% U234, 0.712% U238, 0.006% U235

99.282% U235, 0.712% U234, 0.006% U238

pressurised water

boiling water

gas cooled

liquid metal cooled

as basic raw material

by neutron irradiation of Uz

by neutron irradiation of thorium

artificially

atomic power

energy

voltage

radio activity

In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator.

Slow or thermal neutrons have energy of the order or 0.025 eV

Fast neutrons have energies above 1000 eV

Fast reactor uses moderator