Jeffrey Immelt, the head of GE, which designed the problem reactors, went to Japan to say that

the nuclear industry has had a “safe track record”

Some careful wording there, leaving much to interpretation.  There could be some serious trouble coming down the pike inasmuch much as there were resignations from GE back when the design was getting approval, and one of those, Dale Bridenbough, is reported to have

said that to the best of his knowledge, the design flaws he had identified were addressed at the Daiichi plant …

More careful wording.  Not that there’s anything wrong with that. But what if the items identified were not addressed. I’m guessing that there is a paper record on this somewhere. Some digging is necessary here to learn if indeed these earlier concerns were handled, and how.