Tritium: the Primary Product

Tritium is Hyperion's headline output — bred in the blanket toward a ~4 kg/yr class — and the fuel every D–T fusion program depends on.

The fuel with no reservoir

Tritium (³H) is a hydrogen isotope with a 12.3-year half-life. It does not exist in useful natural quantities; today it is produced in small amounts as a by-product of fission reactors. Every deuterium–tritium fusion machine must be supplied with it, and at fleet scale demand outstrips any existing source.

Hyperion breeds its own tritium in a blanket surrounding the plasma. The reaction ⁶Li(n,α)³H captures a neutron on lithium-6 to make one tritium atom plus helium-4, releasing 4.8 MeV. Because the D–T reaction that produced the neutron also consumed one tritium atom, breeding more than one tritium per fusion neutron is what makes the fuel cycle self-sustaining.

The ~4 kg/yr class target

At 85.0 MW of D–T fusion power the neutron production rate sets an upper bound on breeding. The reference design targets a tritium output in the ~4 kg/yr class, sized to seed the burner fuel cycle and to supply external offtake. The realized figure depends directly on the tritium breeding ratio achieved.

The honest gate

A target output assumes the net (as-built) TBR clears self-sufficiency with margin. At the 1.8 design target the local-vs-net reconciliation is unresolved, and tritium self-sufficiency is not yet demonstrated in hardware. The ~4 kg/yr class is a design figure, contingent on closing that gate.

This page describes a design-and-simulation study, not a built machine. Construction begins Q2 2027; first-of-a-kind (FOAK) first tritium is targeted near 2030. No net-gain claim is made before FOAK.