The design flaw (every equipment has some...) did not condemn it: this Chernobyl's reactor was a RBMK, many RBMKs ran for decades after the disaster, and some do run right now:
https://en.wikipedia.org/wiki/RBMK#List_of_RBMK_reactors
A non-maintained flawed huge dam copes with decades of major problems then a typhoon breaks it, while a nuclear plant missing a few bricks exposed to a huge tide breaks havoc in a few hours.
Fukushima was designed to survive to earthquakes (all most things are in Japan). The mishap at this nuclear plant had, indeed, a very simple cause (a wall wasn't high enough) and it caused 2203 deaths https://en.wikipedia.org/wiki/Fukushima_Daiichi_nuclear_disa... then a very expensive cleanup (which is considered as far from perfect) https://en.wikipedia.org/wiki/Fukushima_disaster_cleanup
The Onagawa plant, more exposed, survived: https://en.wikipedia.org/wiki/Onagawa_Nuclear_Power_Plant#20...
A non-maintained flawed huge dam copes with decades of major problems then a typhoon breaks it, while a nuclear plant missing a few bricks exposed to a huge tide breaks havoc in a few hours.