Tritium Offtake

Surplus tritium above self-sufficiency can be supplied to fusion programs and neutron-target users — the offtake that also seeds new units.

Supplying the fuel of the field

Tritium offtake is the surplus tritium remaining after the machine covers its own fuel needs, losses, and startup reserves. Because there is no natural tritium reservoir and only limited fission-derived supply, any assured new source of tritium is strategically important to the entire D–T fusion field.

Who needs external tritium

• D–T fusion experiments and prototypes that do not breed their own
• Neutron-generator and target manufacturers
• Internal Kronos fleet startup — charging the next unit
• Research and calibration users of tritium

Deliveries are physical shipments of a controlled radioactive material. Each batch is purified, separated from accumulated helium-3, assayed by calorimetry and gas analysis, and documented under the tritium accountancy system. Containment, transport authorization, and radiopurity certification accompany every shipment.

The surplus is set by breeding

Only tritium bred above self-sufficiency is available as external offtake, so the volume is governed directly by net TBR. At a thin net margin, little is available; at the reference 1.8 target, the ~4 kg/yr class supports meaningful offtake and fleet seeding. Because the net-TBR reconciliation is open, offtake volumes are design targets, not committed quantities, before FOAK.

This page addresses the material stream and its users only, with no commercial terms stated, per policy.

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.