Hazard Categorization vs Fission
Categorizing a plant by its actual hazards places fusion well below fission, because the defining fission hazards are absent.
Hazard categorization ranks facilities by the severity of what could go wrong. It is the honest way to compare technologies: not by intent or reputation, but by the physical hazards present. When fusion is categorized on this basis, it sits well below fission because the hazards that define fission's category simply are not present.
Hazard-by-hazard comparison
| Hazard | Fission | Fusion (Kronos) |
|---|---|---|
| Fissile material | Present | Absent |
| Chain reaction / criticality | Possible | Impossible |
| Meltdown potential | Yes (decay heat) | No (small decay heat) |
| Long-lived spent fuel | Yes | No |
| Large off-site source term | Yes | No (tritium-bounded) |
| Mobile radioactive fuel | Solid fuel | Tritium (contained) |
The comparison is not that fusion is hazard-free — tritium, neutrons, magnets, and cryogenics are real and are engineered for. It is that fusion lacks the specific hazards that put fission in its regulatory and public-safety category: fissile material, criticality, meltdown, and a large severe-accident source term.
Why categorization drives regulation
Because regulation and emergency planning should scale to hazard, this categorization is the technical basis for the byproduct-material framework and the right-sized emergency planning. The burner's low 5.44% neutron fraction and minimal tritium place it lower still.
Categorize by the physics, and fusion's place is clear.