Environment, safety & waste class.

Fusion has no runaway reaction, no long-lived actinide waste, and no CO₂. What is left is tritium handling and neutron-activated structure — and Kronos engineers both machines to keep those small.

Public dose

Closes at detritiation factor 1–34 (vs ITER 1,000–10,000)

Breeder waste

≤ Class C at certified low-activation materials

Burner waste

Scheduled waste ≈ zero — low-neutron D–³He

No

No meltdown path · no long-lived actinides · no carbon

Fusion's safety case is structural: the plasma holds only seconds of fuel, so there is no chain reaction to run away and no decay-heat meltdown path. What an honest environmental page must still address is tritium (the breeder's working fuel) and neutron activation (structure made radioactive by fast neutrons). Kronos addresses both, per machine.

The breeder (HYPERION)

• Public dose closes at a modest margin. The routine public dose target is met with a detritiation factor of just 1–34 — compared with the 1,000–10,000 assumed for ITER-class facilities. The breeder does not need heroic tritium cleanup to be safe at the fence line.
• Waste at or below Class C. With certified low-activation structural materials, the activated components qualify as Class C low-level waste — no deep-geologic repository. This depends on impurity control (e.g. niobium below ~10 ppm); one isotope, Ag-108m, remains an open control item and is listed as such.

The burner (Aegis / MetroVolt)

• Low-neutron fuel means little to activate. Because D–³He carries only ~5% of its power in neutrons, the burner's first-wall damage life is long (104–428 full-power years) and its scheduled radioactive waste is nearly zero — on the order of 0.035–0.144 component changes over a 30-year life.
• Wall loading far below the breeder. The neutron wall loading is a small fraction of a D–T machine's, which is exactly why the burner's availability is limited by plug reliability rather than by neutron damage.