Gates is worth ~$100B. The US federal budget is ~$4.1T per year. This is like asking someone with a 4 Gbps connection to transfer some files and offering to burn a single mini CD to help them.
> The US federal budget is ~$4.1T per year. What is the current US federal budget for building or supporting nuclear energy infrastructure?
$30.6 billion requested in 2019 for the Department of Energy, which includes more than $757 million for the Office of Nuclear Energy (NE).