Nuclear can absolutely load follow. It's just not used that way today in the USA because the nuclear generation capacity is below the base load, the cost is com

Nuclear can absolutely load follow. It's just not used that way today in the USA because the nuclear generation capacity is below the base load, the cost is completely sunk, so you as the plant owner might as well run it at 100% and sell all of the electricity into the grid. If nuclear was a much larger component of the overall generation capacity in the USA we'd see them load following up and down over the 24 hour cycle.