Both are rather literally possible.

Fukushima was "we didn't make a good enough plan for how to deal with tsunamis in this tsunami-prone area", so that's basically certain with any major infrastructure project that "saved" too much money by vibe-engineering everything and not having real humans give a second pair of eyes to the plans.

A Hiroshima-style incident? LLMs are wildly sycophantic and being used by militaries despite active resistance from, well, everywhere. Did it get (meaningfully) used by Israel or the USA when planning the attack on Iran? It's quite possible that… well, Iran was never a sleeping giant (and the quote is fiction anyway), but ultimately the effect may be the same for Israel as it was for Japan from having attacked Perl Harbour.