You might need to adjust your sources.
Do you have any evidence for your claim?
This meme that nuclear power plants are unprofitable and require subsidies has been spread wide and far by the anti-nuclear lobby, but is still false.
As an example, when the Greens started to come into government in Germany, they tried to force nuclear operators out of business by creating onerous safety rules just for the purpose of forcing them out of business.
It didn't work.
The plants were so profitable that they could afford even the most ridiculous additional safety requirements. So they had to make them illegal.
Furthermore, you can look at France. EDF has been immensely profitable, despite having to sell a large amount of electricity at discounted rates.
Here's an explainer.