Earlier quoted context omitted.
The hard facts are that Russia processes half of the world's uranium and no country, not even the US, could sanction their nuclear energy sector. This is the reality, not your fuel efficiency and breeder reactor hopium. https://www.washingtonpost.com/business/2023/01/21/uranium-i...
The article you cite clearly states that even the worst-case impact of Russian supplies would be minimal: "at worst, some long-term Russian supply contracts could not be executed, and that would perhaps raise the price of electricity 1 or 2 percent." World-ending.
Also, it's an US-centric article and as it's states, the US only has a 15% dependency on Russia. So you are already looking at a very favorable outlier that makes the situation look better than it actually is. Most other countries have a much greater dependency.