The Tritium Self-Sufficiency Question

Whether Hyperion breeds enough tritium to fuel itself with surplus is not yet proven; it is the central open question behind every product figure.

Not yet proven — and stated as such

Tritium self-sufficiency means the machine breeds at least as much tritium as it burns, plus enough to cover losses and, for a foundry, to ship and to seed new units. It is the precondition for a D–T fusion economy, because there is no external tritium supply at fleet scale.

Hyperion is designed toward self-sufficiency, but Kronos does not claim it is achieved. It is a design and validation objective gated on the net TBR clearing 1.0 with margin — and the local-vs-net reconciliation at the 1.8 target is unresolved. No hardware demonstration exists before FOAK first tritium near 2030.

The full balance

Self-sufficiency is not just net TBR > 1.0. The realistic condition accounts for:

• Plasma burnup — tritium the reaction consumes (only a few percent is burned per pass; the rest is recycled)
• Radioactive decay — 5.47% of held inventory per year lost to He-3
• Holdup — tritium trapped in walls, blanket, and pumps
• Processing losses — inefficiency in extraction and purification
• Startup inventory — tritium needed before the machine breeds its own

Why candor here builds trust

Overstating self-sufficiency is the most common way fusion breeding claims fail scrutiny. By treating TBR as a lever, separating local from net, and naming self-sufficiency as unproven, Kronos keeps the product figures honest: the ~4 kg/yr class and ~1.97 kg/yr helium-3 are targets contingent on this gate closing.

Construction begins Q2 2027; first-of-a-kind (FOAK) first tritium is targeted near 2030. No net-gain claim is made before FOAK.