Where was the only nuclear power plant in the U.S. that was ever automatically shut down because of an earthquake?

No, it wasn’t in California… It was in Virginia.

The North Anna Nuclear Power Plant in Virginia was automatically shutdown when it was shaken by the August 2011 magnitude 5.8 earthquake in Virginia.

And…

North Anna was also the only nuclear power plant in the U.S. where measured ground shaking ever exceeded the level it was designed to withstand.

Alan Kafka
Weston Observatory
Department of Earth and Environmental Sciences
Boston College