Not relative to simply reducing the volume of carbon produced, by shifting the composition of the grid.
You understand that there are already too many greenhouse gases, right? By the time we do all of this there will be even more. It’s not like the grid is the only (or even the majority) of greenhouse gases. How do you account for both all the past emmisions and all the future emissions plus emissions from other sources?
Given the abject failure of Westinghouse to produce a reliable mass production model, it’s an enormous waste of investment.
If nothing else, we’d be better of someone buying existing designs from Areva. But we don’t do that, because we insist on “Buy American” legislation that doesn’t get us any actual product.
The main alternatives being French and Chinese reactor designs. I can understand why the USA doesn’t want to use Chinese reactors, we in the UK made a similar decision and went with French designs instead if I am remembering correctly. I wouldn’t be against the USA using French designs. The thing is though I can’t see how more research could possibly be a bad thing, we have much work to do in both fission and fusion technologies. Putting all our bets in China or France might not be the best idea.