Safety isn't a technical problem, it's a human problem. Over long periods safety measures end up being cut and introduce risk. There's also design decisions rev

Safety isn't a technical problem, it's a human problem. Over long periods safety measures end up being cut and introduce risk. There's also design decisions revolved around cost even though better solutions exist. Then there's just plain oversights. For example we all know earthquakes and tsunamis exist and yet the Fukushima still happened.