Yes. This mode of operation has been achieved many times for a period of several hours during experimentation. However, to achieve a self sustaining mode of operation, the nuclear reactions must be allowed to become very energetic, and the output becomes so high that explosions are possible. During ordinary use the system will be utilizing only a fraction of the output possible when in a self sustaining mode.
That is so funny I don't even know where to begin.
Fair enough, although I don't know why you'd think that it's funny. Aren't standard nuclear processes achieved inside a closed containment?
How is this any different?