If they're just using the tritium booster gas for most of the yeild, and the uranium as essentially an active tamper; and have the bomb fizzle before full initiation;wouldn't that preclude an full EMSweep flash?You wouldn't get the full effect; but you would get some yeild from the tritium fusion.Then you could say "no flash, not nuclear :P"Old nuclear bomb tests sometimes fizzled at a few kiloton. (when they were supposed to be 100s of kilotons to megatons). Ripple I is one such example.Ripple II worked and was many megatons.It could crack concretes that conventional explosives cannot; since the reaction would still be faster by orders of magnitude than a chemical reaction.(oh and they cut off the first 2 seconds of the video)