There's an article in the May 12 2008 New Yorker Magazine by Malcolm Gladwell, in which he talks about brainstorming sessions by teams of inventors headed by Nathan Myhrvold. One of the ideas is a small Nuclear Reactor with no moving parts. Supposedly the core would be about 3x10 meters, enclosed in a sealed armored box. It would run for thirty years, and put out 3 gigawatts. The point was that with no moving parts there would be no possibility of human error, and nuclear accidents could be eliminated. It would also be designed to eliminate nuclear weapon fuel generation. Are there some flaws in this idea?