It's worth noting that Fukushima stood up to the earthquake quite admirably, and it was only the tsunami that fucked their shit up.
The tsunami did serious damage. The actual fuck up was human error. Or at least amplified the damage done.
How so?
They wanted to salvage as much as possible (which isn't bad by itself), but AFAIK it wasn't possible by the degree they wanted.
The earthquake did no real damage, that was part of the design. The tsunami knocked out cooling, and the emergency generators (they blamed thst failure on being built too close to the sea).
They had to flood the reactor with sea water to cool it down, but that basically made some stuff unusable. Also, nobody wanted to admit the severity of the damage, so the owners told the people on site to keep on going without flooding the reactor,making things worse, and in the end leading to the actual meltdown. IIRC.
And chernobyl was a chain of unfortunate events coupled with parts being shut down for a test, amd a crapload of human mistake and maybe a bit of ignorance.