I agree with @knatschus@discuss.tchncs.de, everything about nuclear technology involves cost and time overruns. A nuclear power plant would ultimately take a decade or more to complete. Even the newer developments of SMRs or Thorium require real world experience and expertise that limit the number of countries who can explore this technology.

While countries are quick to make claims that they unlocked commercial thorium reactors, I’d say the only superpower realistically on track is China.

China hopes to complete the world’s first commercial thorium reactor by 2030 and has planned to further build more thorium power plants across the low populated deserts and plains of western China, as well as up to 30 nations involved in China’s Belt and Road Initiative.

https://en.wikipedia.org/wiki/Thorium-based_nuclear_power