Comparisons & Context
Fusion vs Fission
Fusion and fission are often lumped together as 'nuclear'. On the things that matter, they could hardly be more different.
| Reaction | Fusion: merge light nuclei · Fission: split heavy nuclei |
|---|---|
| Chain reaction | Fusion: none · Fission: yes |
| Meltdown | Fusion: impossible · Fission: possible |
| Long-lived waste | Fusion: none · Fission: actinides |
| Bomb material | Fusion: none · Fission: plutonium pathway |
Fusion merges light nuclei and stops the instant conditions falter; fission sustains a chain reaction in heavy nuclei and must be actively held back. That single difference cascades into fusion's safety, waste and proliferation advantages.
What fission still wins on todayFission is a mature, deployed technology producing power now; fusion is not yet built, though Kronos's HYPERION breeder is scheduled to begin construction in Q2 2027. Kronos states both plainly.
Common questions
Is fusion just like fission?
No. Fusion has no chain reaction, no meltdown, no long-lived high-level waste and no bomb material. It stops the instant conditions falter.