NRC regulations require nuclear power plants to report any radiation doses detected at the plant that could be harmful to the public. This would include doses that are generated by the plant or by an external source. During an event in the United States, it is the state’s responsibility to provide protective action decisions for public health and safety.
Here is a list of all the nuclear power plants in the United States. For a more detailed map of these plants, check out the United States Nuclear Regulatory Commission’s map and site.