I can’t speak for European regulatory bodies, but in the USA the relevant authority is the Nuclear Regulatory Commission, which was founded in 1974 and approved

I can’t speak for European regulatory bodies, but in the USA the relevant authority is the Nuclear Regulatory Commission, which was founded in 1974 and approved zero new reactor designs between 1974 and 2020. Conservative doesn’t even begin to describe the stance of regulatory agencies, despite newer designs being much safer from decades of design improvements, nobody wants to be the person responsible for signing off and issuing a safety certification.