The interest is higher because the risk is higher, the capital costs to build the thing are massive so a loan that defaults would be a big problem. The question

The interest is higher because the risk is higher, the capital costs to build the thing are massive so a loan that defaults would be a big problem. The question is who supplies the loan too, are they government backed in Russia and China? If yes I can imagine that the rates would be quite a bit lower, this kind of state support is illegal in the EU afaik. Most plants will be run as LTOs, at least in western countries favourable to nuclear, and then the interest costs matter less than you think anyway. Then it's pretty much the cheapest source of energy.