The power plants in the United States have the same backups and risks as plants in Japan (see article) California currently has two operational nuclear plants. PG&E's Diablo Canyon Power Plant in San Luis Obispo County sits near several fault lines, including the San Andreas Fault. It's designed to withstand a 7.5 magnitude earthquake. The San Onofre Nuclear Generating Station in San Diego County isn't as close to active faults and is designed to withstand a 7.0 magnitude quake.
California is at risk for earthquakes above these levels, being along a major fault. The state is also at risk for tsunamis. Although the combination of being hit by earthquakes and tsunamis is fairly rare – usually the tsunami effects another location – if it were to happen in the United States, California would be the most probable location for such an occurrence.
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