Nuclear plants require appreciable scheduled downtime for refueling and other maintenance operations. Not an order of magnitude difference or anything, but I wo

Nuclear plants require appreciable scheduled downtime for refueling and other maintenance operations. Not an order of magnitude difference or anything, but I would bump up your required nuclear plant count by at least 15% to account for this. On the other hand, I would expect repeated installation of the same AP-1000 model to reduce in cost over time, so that will help out a bit - although R&D into more interesting plant designs may bring prices up as well.