"Tsunami." That's a Japanese word, isn't it?
Yup. And their lengthy historical records of tsunamis included reports of some twice as high as what hit Fukashima. Realistically they SHOULD have predicted the possibility of this. If they'd just sited their backup generators and power lines better they probably could maintained coolant power and prevented the meltdown. Had they retrofitted the reactor buildings to vent hydrogen gas, as American reactors of the same basic design already had, they wouldn't have had a hydrogen explosion blow out one of their reactor buildings to complicate things further.