Because it's 3x more expensive.

I would _like_ to say because it's still dangerous, and you also have to commit to managing the waste for thousands of years, which is costly and dangerous, but that consideration is probably not paramount in US politicians' minds.

Cost to taxpayers.

It’s politically unpopular to propose a 10-year public works project with very unpredictable budget unless it’s a highway.

If it doesn’t get cancelled, ratepayers pay for the power and a surcharge to fund retiring the plant.

Serial production stopped in the 1980s. The US lost the economies of scale of it's nuclear industry, so plants built after that experienced higher costs. That, plus misinformation about the safety and environmental impact of nuclear power.

Because we have cheap, but unreliable sources to run. Will get reversed during first bigger blackout