One big difference in the costs is that now days, new reactors are required to fund their own eventual decommissioning and long-term waste handling costs from operating income.

That wasn’t always the case! In the UK, taxpayers have been left with enormous liabilities for managing and cleaning up old nuclear sites:

https://www.theguardian.com/environment/2022/sep/23/uk-nucle...

Finland deserves credit for actually building a long-term waste storage repository, which helps solve one of the biggest ongoing issues/costs with nuclear decommissioning.