Tritium Self-Sufficiency
A deuterium-tritium plant must breed all the tritium it burns; self-sufficiency is what makes the fuel cycle closed and independent of external supply.
The self-sufficiency requirement
Tritium does not exist in usable natural quantities, and the world inventory is small. A deuterium-tritium machine that relied on external tritium could not scale. The breeder (Hyperion) is therefore designed to breed at least as much tritium as it consumes, closing the loop so the plant sustains its own fuel with only deuterium and lithium coming in.
What a surplus enables
Breeding above unity does more than sustain one machine. A surplus can be used to provide the initial tritium charge for the next plant, so a fleet can grow from its own production rather than waiting on scarce external stocks. Surplus tritium not needed for startup decays into recoverable helium-3, feeding the isotope supply.
- Inputs to the loop are only deuterium and lithium — both abundant
- Breeding ratio above one is the condition for growth
- Surplus starts new machines or becomes helium-3
- External tritium dependence is designed out of the cycle
Honest gate
Demonstrating true net self-sufficiency in real blankets — accounting for losses, retention, and geometry — is an open engineering problem the program tracks. The breeder is a design and simulation study; first-of-a-kind first tritium is targeted near 2030. See the breeding-ratio lever and the closed fuel cycle.
Independence, not just abundance
Abundance of deuterium and lithium is necessary but not sufficient; a plant also needs to close its tritium loop, because tritium cannot simply be bought in quantity. Self-sufficiency is therefore the property that converts abundant raw inputs into genuine fuel independence. A machine that breeds and recovers its own tritium answers to no external fuel supplier at all once it is running.