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Engineering & Subsystems

The Tritium Fuel Cycle

Breeding, extracting, and recycling tritium so the plant fuels itself.

Engineering & SubsystemsUpdated 2026-08-11
Breeding ratio
1.8
Tritium output
4.0 kg/yr
Startup inventory
6.47 kg

A D–T plant must breed, extract, purify and re-inject its own tritium. HYPERION's blanket breeds 4.0 kg/yr at a breeding ratio of 1.8, against a startup inventory of 6.47 kg, while co-producing helium-3 for the burner.

Tritium handling and accountancy are licensing-relevant systems, treated as a gate item on the breeder side.

The tritium fuel cycle is a closed loop unique to the D–T breeder: breed in the blanket, extract and purify, account for every gram, and re-inject. HYPERION runs it at breeding ratio 1.8 to make 4.0 kg/yr while co-producing helium-3, and because tritium is mobile and radioactive the loop is one of the breeder's licensing-relevant systems.

The closed tritium fuel cycle: breed, extract, purify, re-inject.
The closed tritium fuel cycle: breed, extract, purify, re-inject.

Common questions

What is the tritium fuel cycle?

A closed loop unique to the D–T breeder: breed tritium in the blanket, extract and purify it, account for every gram, and re-inject it. HYPERION runs it at breeding ratio 1.8 for ~4.0 kg/yr/yr.

Why is the fuel cycle licensing-relevant?

Because tritium is mobile and radioactive, its inventory, containment and accounting are core safety systems — one reason the breeder carries most of Kronos's radiological engineering.

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Content reviewed August 2026 · design-and-simulation stage