Some japs were working on a similar thing a couple years back (linked here too, I think?) that was just slightly smaller, energy for a single block, but didn't need refueling either. aka a single-use reactor with, I think, 80 years of energy.
Regardless, it's really cool and I hope the idiot lefties in these parts don't start chaining themselves to my garden when I buy one of them things to sell cheap-ass energy ^^