Direct Internal Recovery (DIR)

DIR recovers and recycles unburned fuel within the plant on a single pass. Kronos targets >95% single-pass extraction — pre-registered prediction P4.

What

Recovers unburned fuel inside the plant

Target

> 95% single-pass extraction (prediction P4)

Gate

G3

Benefit

Minimizes fuel inventory and loss

No fusion plasma burns all its fuel in one pass, so a plant must recover the unburned deuterium and helium-3 and feed it back in. Direct internal recovery (DIR) does this efficiently and on-site — separating and recycling the fuel within the plant's own loop rather than through a large external processing chain, which keeps the working fuel inventory small.

Kronos MetroVolt sets an aggressive target: > 95% single-pass extraction, pre-registered as prediction P4 and adjudicated at the G3 gate. A tight, high-efficiency fuel loop matters both for economics (less fuel tied up, less lost) and for the staged fuel cycle, which depends on cleanly managing the mix of deuterium, bred ³He, and tritium as the plant moves between stages.