There's greater efficiency in larger sizes. Reactor walls scale with surface area, their output scales with volume. There's also regulatory issues, too. I'm not

There's greater efficiency in larger sizes. Reactor walls scale with surface area, their output scales with volume. There's also regulatory issues, too. I'm not sure how the UK operates, but in the US every nuclear reactor - regardless of size - has to pay $375 million in insurance. And there's a push to increase this to $450 million [1]. This fixed overhead regulatory cost effectively prohibits anything but the largest reactor designs, as 50 SMRs producing 1.5 GW total incurs 50x the regulatory cost as one 1.5 GW reactor. 1. https://www.federalregister.gov/documents/2016/12/30/2016-31368/increase-in-the-maximum-amount-of-primary-nuclear-liability-insurance https://www.federalregister.gov/documents/2016/12/30/2016-31...