In Finland, it is a regular joke that to license technology for nuclear power plant use is actually an art of interpretation of the will of the safety authority. But sometimes it is not about the interpretation why the nuclear regulatory text is so hard to understand. Making mistakes is something that happens to everybody, even to Safety Authorities. Within this post, I present one example of such a case in public, because the issue at hand is bit broader than just correcting wording, and good to understand by domain experts.