Those do NOT exist in the US. https://www.scientificamerican.com/article/first-u-s-small-nuclear-reactor-design-is-approved/
The US Navy has more operational reactors than any State in the United States. If it was up to the Navy...
The plans for such have just recently been approved and you can see in the article the fear that exist surrounding safety.
I’m of the opinion the Nuclear Regulatory Commission, one of many organizations belonging to the fourth branch of Government called unelected bureaucrats is responsible for the lack of private nuclear power in the United States.
https://www.nrc.gov/about-nrc.html
Could be. I’m not up on the topic as much as I probably
should be, being curious about these sorts of things.