It might have been the biggest tsunami ever recorded, but it's nothing new that tsunamis do occur in Japan, and still the plant was allowed to be built and operated directly at the seaside at a height of only 10 meters (https://en.wikipedia.org/wiki/Fukushima_Daiichi_nuclear_disa...). And why? Because the nuclear lobby had a lot of influence in Japan.

I'm not sure where you get the 200,000 evacuated people from, but the only mention of 200,000 people being evacuated in the article you are quoting is in fact in the "Nuclear power plants" section...