To replace ALARA, the NRC will start with a limit at which evidence clearly indicates radiation impacts would be apparent and set exposure thresholds below that. From lowest to highest exposure, these thresholds will require increasingly aggressive efforts to limit exposures.

The language of the details is a bit confused, however. As its name implies, the LNT model suggests there are no thresholds below which biological risks go away, and the NRC accepts that model. Yet it’s regulated based on thresholds. It’s also referring to those thresholds as an implementation of an “optimization” approach to safety. But it also quotes a definition of optimization that refers to it as a form of ALARA—which, again, is a term that the NRC wants to get rid of.

Beyond that action, the rule changes the NRC is proposing largely focus on updating regulations on the use of equipment to monitor exposures. Technology has advanced since the agency last modified its requirements there, and it’s using this proposal to update them accordingly.

Number crunching

Regardless of the confusion, it’s clear that the changes aren’t going to cause the sort of boom in nuclear power that the Trump administration expected in its executive order. One of the key features of the planned rules is that any organization that’s currently in compliance will remain that way without making any changes. Changes will only make sense if an organization thinks it can save money by adopting them.

And, as noted above, those savings for industry will be pretty minimal, with the total estimated at $9.5 million a year. Even if we assume that these savings go only to nuclear power and are ascribed only to dropping ALARA (as opposed to cheaper exposure monitoring, for example), spread out across the 57 nuclear plants in the US, that means just an average savings of a bit over $150,000 per plant.

So, those who viewed ALARA as the cause of all the nuclear industry’s woes will likely be excited to see the NRC eliminate it. But they’ll also be disappointed to find that its scientific foundations remain intact, and the regulatory environment will be minimally changed as a result.

https://arstechnica.com/science/2026/07/nuclear-regulatory-commission-plans-really-minor-changes-to-safety-regs/