Tritium Self-Sufficiency

Self-sufficiency means breeding at least as much tritium as is burned plus decay and losses; for Hyperion this is not yet proven.

The break-even the fuel cycle needs

A D-T machine is tritium self-sufficient when it breeds at least as much tritium as it consumes, with enough surplus to cover radioactive decay (tritium has a ~12.3 year half-life), processing losses, and the inventory tied up in the fuel cycle at any moment. This requires net TBR comfortably above 1, not merely above 1 on paper.

Hyperion's product case — a tritium class output near 4 kg/yr and a helium-3 coproduct — presumes not just self-sufficiency but surplus breeding for export. That is the optimistic end of the lever. The honest statement is that tritium self-sufficiency has not yet been proven for the machine at any lever setting; it is a target the design is built toward and the FOAK is meant to test.

What proving it requires

Demonstrating self-sufficiency means resolving the local-versus-net breeding gap, closing the blanket coverage question, quantifying processing losses in the tritium plant, and measuring the actual breeding in hardware. Until those are done, self-sufficiency is a design claim with an open verification, and it is labeled as such rather than assumed.

• Needs net breeding above burn + decay + losses, with margin
• Surplus breeding is required for the export product case
• Not yet proven at any lever setting — a FOAK verification target

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