is not as unattainable as it at first sounds, because it really only means 125× increase in a few very specialized nuclear components. 125× with LWR is out of the question because of RPV fabrication.
In terms of the output of generic steam-plant components, it doesn't necessarily even mean tripling current output, especially assuming reactor types (such as HTR or the oil-cooled CANDU derivative) which can produce steam suitable for existing turbogenerators.