Can you explain your rationale a little? Are you considering a heavy metal wire/coil plus an additional Ni fuel powder or just the heavy metal wire with a current flowing through it in H2/D2? That sounds on one hand a little like Brillouin and on the other hand a little like Langmuir.
Thanks for the link to the 238U at United Nuclear. That would certainly be an interesting ingredient in the dusty plasma reactors that BobG is presently investigating. I am preparing a drawing for a dusty plasma reactor of my own. It wouldn't be very expensive to make, nor beyond my machining capability. I estimate less than $200 to build.