[midjji]

The wiki article gives a decent overview: https://en.wikipedia.org/wiki/Olkiluoto_Nuclear_Power_Plant#... Though you will need to follow the references, look for STUK approving some methodology, then claiming its results are insufficient.

[tuukkah]

Umm, it's not the safety regulator's task to promise the results will be sufficient if you use a specific methodology: "Scrum methodology is fine, so the resulting software quality will be fine too."

[midjji]

There is much more to it than that in this case.