Noisy ← this week

The world is being quietly rearranged by people who write very long documents.

March 30, 2026
Federal Register
The title they went with
Risk-Informed, Technology-Inclusive Regulatory Framework for Advanced Reactors Noisy translates that to

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

The agency wrote the rule twice to make it usable, and a parallel executive order may require writing it again before anyone uses it.
What happened
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.
before light-water reactors only
after all reactor types eligible
Why this matters
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.
The NRC has spent six years writing instructions for how to read any book, after fifty years of only being allowed to review one book.
Who wins, who loses
who wins Advanced reactor developers, who quietly received permission to be judged on their own terms after fifty years of being judged on everyone else's.
who loses The NRC, which must now build technical capacity to evaluate reactor designs it has never seen, on a timeline set by a parallel executive order it did not write.
also Companies building molten salt, high-temperature gas, and small modular reactors, and anyone who has been waiting since 2019 to find out if Congress actually meant it.
Jargon decoder
NEIMA Nuclear Energy Innovation and Modernization Act, a 2018 law that told the NRC to write exactly this kind of rule
risk-informed safety rules based on the actual probability and consequence of failure, not a fixed checklist written for one reactor type
performance-based rules that specify what outcome a system must achieve, not exactly how it must be built
light-water reactor the standard nuclear reactor design that uses ordinary water to cool the core — the kind in almost every US nuclear plant today
technology-inclusive applies to any reactor design, not just light-water reactors
The signal
Why this hasn't landed yet
The rule reads as a regulatory process amendment, not a decision, and no reactor has actually been licensed under it yet, so there is nothing to show, no ribbon to cut, and no concrete winner to photograph.
What happens next
The first Part 53 license applicant, whoever they are, will immediately test whether 'technology-inclusive' means what the NRC thinks it means, probably within three years, and probably while Executive Order 14300's overhaul is still running.
The catch
Light-water reactor incumbents, who benefit from the NRC having no institutional experience evaluating competing designs, lose nothing while the agency spends years building that capacity from scratch.
The longer story
The longer arc
The structural closest analog is 10 CFR Part 52, introduced in 1989 to streamline the bifurcated licensing process. Of 20 applications submitted under that modernization, two reactors reached commercial operation, both years late and billions over budget. The NRC is now modernizing the modernization.
Part of a pattern
At least three major nuclear jurisdictions have pursued technology-neutral licensing modernization since 2018: Canada started vendor design reviews for SMRs in 2018, the UK launched its Generic Design Assessment process for advanced reactors around the same period, and the US finalized Part 53 in 2026. None has yet licensed a commercial advanced reactor under the new frameworks.
If you insist
Read the original →
The Sendoff
The NRC spent fifty years licensing nuclear reactors using rules that only worked for one kind of nuclear reactor. The new rules will work for all kinds. This took an act of Congress.