New reactor designs no longer have to pretend they're from the 1960s

US nuclear regulators created a new licensing path for reactor designs that don't use the cooling technology the agency has regulated since the 1960s. This means companies building fundamentally different reactors no longer have to squeeze their designs into rules written for a single technology type.

For 50 years, every new reactor design had to prove safety using methods built around light-water reactors — an expensive, slow process that effectively blocked anything genuinely different. This rule breaks that lock. A company with a molten-salt reactor, a fast reactor, or any other design can now be assessed on its actual safety case instead of forced into a template it was never built for. The question is whether this actually speeds licensing or just creates a new procedural maze. The NRC has to write the detailed guidance that makes this real, and that's where the actual work happens.