There was pretty much nothing going on in terms of nuclear power development in the US between 1990 and 2008 or so, and Watts' Bar is the only reactor to come online in the US in the last 25 years. Fracking wasn't the cause of that lull.
People stopped building new reactors in that time but they were also doing license extensions and operating and making good money. Today they are shutting down early in deregulated markets because natural gas brought electricity revenue below O&M costs.
