The U.S. Nuclear Regulatory Commission’s 2023 decision to regulate fusion energy as byproduct material rather than under the stricter fission reactor framework — a landmark ruling for the commercial fusion industry.
In January 2023, the U.S. Nuclear Regulatory Commission (NRC) voted unanimously to regulate fusion energy systems under the existing byproduct material framework (10 CFR Part 30) rather than creating a new framework or applying the fission reactor regulations (10 CFR Part 50/52). This was one of the most consequential regulatory decisions in the history of fusion energy.[1]
The NRC found that fusion’s fundamental safety characteristics — no chain reaction, no meltdown mechanism, limited radioactive inventory, no high-level waste — do not warrant the regulatory framework developed for fission reactors. The decision allows Agreement States (39 states) to regulate fusion facilities under their existing radiation control programs.[2]
The ruling provided regulatory certainty that had been lacking for decades, encouraging private investment and site selection. Tennessee became the first state to enact fusion-specific regulations (effective June 2026). Several other states are developing their own frameworks. The NRC’s decision has influenced regulatory discussions in the UK, EU, and Asia.[3]