The Byproduct-Material Framework
Because fusion handles radioactive material without fissile fuel or a chain reaction, it fits the byproduct-material regulatory framework.
How a facility is regulated should match the hazard it actually poses. A fusion plant handles radioactive material — chiefly tritium and neutron-activated components — but it has no fissile material, no chain reaction, and no large off-site accident potential. That profile aligns with the byproduct-material (Part 30-type) framework rather than the reactor framework built for fissile material and criticality.
Why the fit is natural
- The hazards are radioactive-material handling hazards, not reactor severe-accident hazards.
- There is no special nuclear material and no criticality to license against.
- The bounding accident is limited by a small tritium inventory.
- Safety rests on inherent physics and passive means, shrinking the safety-system scope.
Under a byproduct-material framework, the plant is licensed in proportion to how it possesses, uses, and controls radioactive material — tritium accounting, activation management, effluent control, and worker protection — rather than being regulated as if it could suffer a reactor-style severe accident. This is a right-sizing of regulation to hazard, not a reduction in rigor.
Kronos engagement
Kronos is pursuing pre-application engagement to align on this framework early — see the licensing pathway. The byproduct-material approach reflects a favorable, defensible reading of how a fusion plant's real hazards should be regulated. See hazard categorization.
Matching the framework to the fissile-free, chain-reaction-free reality of fusion is the crux of the licensing case.