Nuclear is expensive because we’ve made it expensive. The most expensive part is bureaucracy. Running nuclear plants is cheap. Even still, the price of nuclear around the world is competitive. If you scroll down to the regional studies, nuclear looks even better. In every place except the US that has nuclear, nuclear is the second cheapest, with large-scale PV the only one higher (which doesn’t price in solutions to provide baseline power, which nuclear has built in). The US has (purposefully) made nuclear appear expensive because laws have been paid for by dirty oil companies.
Nuclear is also one of the safest and cleanest energy sources. If you include negative externalities into the cost (which is never done but should be) nuclear is amazing.
Posting an extra comment to say nuclear waste is not an issue either. Here’s two good videos on the topic that show through example how much it isn’t an issue.
https://youtube.com/watch?v=4aUODXeAM-k&pp=ygUXa3lsZSBoaWxsIG51Y2xlYXIgd2FzdGU%3D
https://youtube.com/watch?v=lhHHbgIy9jU&pp=ygUXa3lsZSBoaWxsIG51Y2xlYXIgd2FzdGU%3D