Some things can't be prepared for, but it sure doesn't hurt to try.
Like in the case of those tornadoes recently, all you can do is hope it misses you if you can't go underground.
There's a hell of a lot more water in the sea than is leaking out and there hasn't been any news of weird effects on animals here. If there were the news would be going insane over it. Still, I'm surprised that nobody has gone to jail over what happened.
Well it was 3% more than usual. Whether that's considered "significant", dunno.
I don't think it's going on unabated, they may have temporarily prevented contaminated ground water from entering the Pacific ocean for now but are struggling to put in place a permanent solution: