Basing Nuclear policy on a design from the 1950’s, which Fukushima was, is like basing automobile safety on the 57 Chevy. No seatbelts, no airbags, no crumple zones, no reinforced and puncture resistant gas tank. All the safety features we take for granted just aren’t there.
What if I told you that a design exists right now that would use nuclear waste as the fuel, and if it lost power as Fukushima did it was actually cool down and automatically shut down safely with zero release of any radiation? That design exists. That design exists and we could be building them right now. At the end you have deprecated uranium as the waste product. Not the safest material, but certainly not nearly as dangerous as what we have buried in the ground now.
Just as modern cars are infinitely more safe than cars from the 1950’s, and airplanes are safer and more reliable, so are modern designed reactors. But we don’t consider that fact. It is like someone arguing that they played Pong once, and don’t see the value of computer simulations because it just wasn’t all that impressive.
This is a link to the Generation IV reactors that are just about ready to have construction started.
Generation IV reactor - Wikipedia
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Most of the Reactors in use now are Gen II or Gen III. Better, but still have a lot of room for improvement. Gen IV is much better than the designs like Fukushima, just as the safety features of a modern car are significantly better than the safest features of a car from 1950’s.