Heh, I've heard it many times, the only problem with nuclear energy is politics.

In particular Fukushima was in a stupid place, engineers were well aware of the the many 100s of years of experience with earthquakes in the ring of fire and calculated that a large expensive wall would be required to protect plant. The sensible place to put the plant was in a different prefecture.

Politics intruded, the plant was put in a stupid place, and the expensive wall was shrunk.