Core catchers do need emergency cooling working. Also, Fukushima had far more basic failures in far simpler safety features being lacking or absent. No pressur

Core catchers do need emergency cooling working. Also, Fukushima had far more basic failures in far simpler safety features being lacking or absent. No pressure-resistant containment to speak of. No hydrogen recombinators. No passive emergency cooling capacity or properly redundant active emergency cooling because of braindead placement of generators. A fish pond on a nearby hill would have helped, together with gravity... Any later western reactor design has those. Look at TMI. Thats what it should have looked like, even without a core catcher. (granted, scenarios are not the same)