What about Spallators? Are they being worked on seriously by anybody nowadays? I liked the idea of subcriticality and the low radioactive lifespans in the waste

What about Spallators? Are they being worked on seriously by anybody nowadays? I liked the idea of subcriticality and the low radioactive lifespans in the waste. But how efficient could the be? And related, is transmutation of waste being worked on? http://en.m.wikipedia.org/wiki/Energy_amplifier http://en.m.wikipedia.org/wiki/Energy_amplifier