SMRTR Science & EngineeringJul 21, 2025Interesting Engineering

World’s first fast neutron nuclear reactor designed to destroy more waste than it makes

SMRTR summary

Stellaria, a French nuclear startup, has raised €23 million to develop the Stellarium, a revolutionary fast neutron molten salt reactor. This fourth-generation design promises to destroy more long-lived nuclear waste than it produces, operate for 20+ years without refueling, and provide passive safety features. Commercial deployment is targeted for 2035, with potential to power large cities and industries while addressing nuclear waste concerns.

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