Even nuclear needs to be coupled with storage…
Stating what should be obvious:
Without a large and growing electricity/energy storage infrastructure, it is impossible for nuclear plants to maintain high capacity factors once their installed capacity significantly exceeds the low points on the grid demand curves.
They might be capable of running more, but if there is insufficient demand they will have to curtail their output if they can't store it.
If you want to ONLY build large, always on nuclear plants, you are resigned to a modest market share for nuclear energy.