Nuclear has the opposite but related problem of solar; whereas you often generate excess solar and need to store it somewhere during the day, nuclear energy often generates too much during low demand times and has excess energy to store as well. And you can’t easily scale down nuclear during lower demand hours.

One of the largest pumped hydro stations was originally built to store excess energy from a nuclear power plant. https://en.wikipedia.org/wiki/Ludington_Pumped_Storage_Power...