That would actually be the U235 atom (U-238 isn't fissionable). You CAN get fissile fuel from U-238 by "breeding" Pu-239, which IS fissionable. Hence the long-term need for breeder reactor technology.
Yeah, I'm being picky.
This is one point the enviro's will not discuss. Just don't locate any new plants in 50 year flood zones, close to active or dormant faults, known dormant volcanoes, hurricane prone areas basically, and provide tight security. In my book, not a problem at all. Just build the new ones with US made / quality controlled materials and skilled legal US labor forces.