This has led to the development of many
different proposals for reducing the magnitude of thewaste stream
from reactor fuels. The Gen-IV plan calls for the use of fast reactors
[2]. A modular helium reactor [5] using the “Deep Burn” concept
has been proposed by General Atomics. Accelerator driven systems
(ADS) have been favored in Europe and also considered by the U.S.
and Japan (cf. [6–8])