And if you're not going to have a clear health threat, you don't want to panic people.

Nobody could tell us or really had a very good idea, if there were a massive release of radiation, what kind of medical treatment people were going to need and this or that, or, indeed, whether there would be medical personnel around.

By Thursday morning, we'd gotten over the worst of it.

The first one, obviously, was walking into my office at eight o'clock in the morning on Wednesday, and being told there was a telephone call saying that there was an incident at Three Mile Island, and that it had shut down and that beyond that we didn't know.

Another very strong image from the first day was giving my initial press conference in the morning - going down and finding out that everything I had said, the essence of what I had said, was wrong.