The geological resources of lithium in the earth are large enough to provide energy for several thousand years without counting the lithium in the sea water. At breakeven, the plasma, to remain at thermonuclear level, has to be powered continuously by an external supply of energy. At the contrary, at the ignition condition, the supply of energy to the plasma is made by the hot confined helium particles. These parameters characterize particle and energy confinement times. They induce the good quality of thermal insulation of the plasma as well as the physical containment of the plasma in the vessel of the reactor.
Breakeven condition is of course less stringent and has, in magnetically confined plasma, an n .
No chain reaction excursion is possible, such as in fission. No after-heat problem. Quantities of radioactive waste from wall and structure is comparable to conventional fission reactors. However the activation is 100 to 1000 times lower. The release of tritium in normal operation, mainly through the cooling circuit, can be kept to a very low level.