The UK nuclear regulator said in a report that it extended invitations to five European regulators to observe its routine general design assessment (GDA) interactions with Rolls-Royce SMR.

The UK Office for Nuclear Regulation (ONR) said this “pioneering international regulatory observation” is the first time in the history of the GDA process that its work has been observed by other regulators.

The invitations were for Finland’s Stuk; the Polish National Atomic Energy Agency; the Swedish Radiation Safety Authority; the Dutch Authority for Nuclear Safety and Radiation Protection; and the Czech State Office for Nuclear Safety.