SeaPRwire – South Korea’s nuclear regulator will open a preliminary review track for small modular reactors later this month, letting developers put a design in front of safety officials before they file for a licence. Around ten companies have signalled they intend to use it, and a few say they will submit as soon as it goes live, the head of the Nuclear Safety and Security Commission said.
The distinction the new track creates is procedural. A licence application asks whether a specific reactor at a specific site can operate. A preliminary review asks a narrower question earlier: whether the design, as drawn, will survive the safety case that licensing will eventually demand. Choi Won-ho, who chairs the commission, described the purpose as reducing regulatory uncertainty for companies while letting his staff learn new designs before those designs are frozen into an application.
Ten applications is a small number, and the list behind it is instructive. BEES is a domestic developer. TerraPower is American. Saltfoss Energy is Danish.
A country building a review track for its own vendors has already found that its first customers are foreign.
There is a sequencing problem in that queue. A foreign vendor’s design has already been shaped by its home regulator’s expectations, so the first batch of reviews will test how far Korean criteria can accommodate a reactor built to somebody else’s rulebook. That is a harder first case than a domestic design, and it arrives first.
What the system does not do is shorten licensing. Nothing in the arrangement changes the safety standards a reactor must meet, and no design approved through the preliminary track holds a licence. The commission is rewriting those standards separately, in phases, with 2030 as the target for covering reactors of different designs and purposes (a scope far wider than the light-water fleet the current rules were written around).
That rewrite is where the schedule risk sits. A review track running against standards that are themselves in motion can produce findings that later need revisiting, and the commission has not said how it will reconcile the two clocks: designs reviewed in 2026 and 2027 will be judged against rules that are scheduled to change by 2030.
The scope of that rewrite is broader than the count of reactors suggests. Rules written around light-water units have to be extended to designs and purposes that the current framework does not cover, and each addition changes what a reviewer is checking against. Standards drafted after the first reviews begin will not be the standards those reviews were conducted under.
For a developer, the arithmetic is simple even without the details. A licensing application that fails is the expensive outcome: years of documentation, a site, and capital committed against a design that the regulator has rejected. A review that fails earlier costs less, and a review that passes gives an investor something to point at before the first concrete is poured. That asymmetry explains the queue more than any incentive the government has offered.
The international piece is not decorative. Korea’s regulator takes part in IAEA work on SMR regulation and is talking to the United States and Canada, both of which already run some form of pre-licensing review. Choi said consistency across borders matters. The practical reason is that a vendor designing one reactor for several markets wants one safety case, not four. If Seoul’s criteria diverge from Washington’s or Ottawa’s, the preliminary review becomes a local detour, not a step toward a global submission.
Consistency is not recognition. Nothing in the commissioner’s account suggests Korea will treat another regulator’s safety finding as its own; the aim is comparable criteria, which still leaves a separate national review, a separate outcome and a separate bill.
Export is the other half of the argument. Korea sent four reactors built on its own technology to the United Arab Emirates under a 2009 consortium deal, all in commercial operation by 2024, and signed for two units at Dukovany in the Czech Republic last year. Choi framed regulatory know-how as part of the export package, not an afterthought: transferring safety expertise to a host country, he said, matters as much as the reactor technology.
Vietnam is the live case. It restarted its nuclear programme in 2024 and has asked the commission for help building a safety framework and training staff. That request is for the regulator, not the vendor. It is a different kind of export – slower to close, harder to invoice, and dependent on the same staff who are simultaneously reviewing SMR designs and rewriting standards.
The agency’s other queue shows how thin that staff is. Ten reactors are in line for lifespan extensions at the request of Korea Hydro and Nuclear Power, and the commission has already granted ten more years to Kori units 2, 3 and 4, which have run for over four decades. Hanbit units 1 and 2 are expected in the first half of 2027, Hanul units 1 and 2 in the second half. Add the SMR track, the standards overhaul and monitoring of Japan’s release of treated water from Fukushima, which the commission says it samples at 78 points, and the workload is the binding constraint rather than the policy design.
Several operational questions remain unanswered. Whether the preliminary review carries a fee, how long it takes, and whether its findings bind the later licence application are all unspecified in the roadmap. Those are the first three questions a developer’s regulatory affairs team asks, and they are usually answered before a programme is announced, not after. Those details decide whether the track is a genuine de-risking tool for developers or an early conversation with no contractual weight – and the developers deciding whether to apply this month will read them that way.
Two things can be checked within a year. Whether the ten interested companies actually file, and whether the first design to pass preliminary review later clears licensing without substantial redesign. The second is the only measure that shows the track did what it was built for.