"The API000 shield building safety functions include shielding plant structures from impact loads, such as tornado missiles, protecting plant equipment during seismic events, similar to containment and shield structures in other reactor designs."

I don't know of any tornado missile that can manage getting through 6 ft of concrete reinforced with layers of steel rebar. Also, even if an earthquake did happen in Georgia, the last 9.4 quake in Japan was against a shield building that was designed more then 40 years ago. I think we can have a bit of faith in some new designs that we're designed without a slide ruler.