Robert Serber describes some of his work at Los Alamos with Teller and the ENIAC calculations.

Fitzpatrick:

The thing is — Von Neumann — sometime I think in the summer or fall of '45 Von Neumann introduces Los Alamos to ENIAC, which I think less than a thousand words of memory, is little by today's standards you know, but I think that in the super, in the report on the conference, and then there is a separate report on the ENIAC calculations, they said it would ignite, the prediction was that it would probably ignite using something like two or three hundred grams of tritium. That's what I'd like to hear what went on and how it got started and —

Serber:

Well, I mean I don't really remember much about the discussion, but my main memory is at the end when Edward wrote up a report on the conclusion of the conference, and the report was incredible, and there was a conclusion point that said it was almost certain that it would work. I don't know if it was to make a record for any future work. I didn't want to discourage Edward from pursuing what he wanted to do, and I thought to tell him what was to more closely the truth than the report, so we went over it and then modified the more extreme statements. But it was pretty optimistic. I went back to Berkeley. A couple of months later it came to me undamaged and it had my name on it.