Nuclear plants pay a fraction of their revenue through their life into special decommissioning funds that have so far been more than enough to perform full gree

Nuclear plants pay a fraction of their revenue through their life into special decommissioning funds that have so far been more than enough to perform full greenfield decommissioning. For waste, there's a separate fund called the Nuclear Waste Fund in the US (and other nuclear-operating countries) that has a current balance of $55B.