Take a few aging nuclear plants that are not built to the latest building standards.

Add an earthquake that is 7 times larger than the plants have been designed for.

Then throw in a very alrge tsunami, once again above design limits.

Add countless other problems due to the decimation of Japan by the combo of the earthquake and tsunami.

Even with multiple problems, the systems work.

Now if that is not a case for nuclear safety, I don't know what is.