> Economies of scale and room for technological/process innovation.

This applies when going from 1 to 2 to 4 reactors.

See https://www.oecd-nea.org/mdep/events/conf-2023/presentations... page 27 for the Chinese approach to HPR1000 (Hualong One) innovation.

Plus the linked article mentioned improvements to manufacturing outside the constraints of the containment.