Home · Fusion vs SMRs
Comparison
Fusion vs small modular reactors (SMRs).
Both promise compact, firm, carbon-free power. The difference is the fuel and the waste: fission SMRs split heavy atoms and leave long-lived waste; fusion fuses light ones and can't melt down.
Side by side
Splitting vs fusing.
Fission SMR
Small modular reactor
- Splits uranium/plutonium — a self-sustaining chain reaction
- Long-lived high-level waste and proliferation controls
- Mature, licensable technology deploying this decade
- Firm, carbon-free baseload
Kronos
Kronos fusion
- Fuses light isotopes — no chain reaction, cannot melt down or run away
- Low-neutron burner: scheduled-replacement waste near zero
- Also makes strategic materials the U.S. can't source at scale
- Firm, carbon-free — prototype targeted 2030, fleet 2036+
Fusion isn't a drop-in replacement for fission — it's cleaner, unmeltable, and it makes fuel and materials on the side.
Verify it yourself
Open by design.
Conceptual design and simulation study; the integrated Kronos machines are not yet built, and certain results are requirement-class. No financial figures are published on this site.