This paper is an introduction to the physics of Accelerator Driven Subcriti
cal Reactors (ADSR) and some technologies associated with them. The basic n
eutronics is presented with a specific discussion of modifications with res
pect to that of critical reactors. The fuel evolution in ADSR's is discusse
d, including the influence of reactivity surges and drops on the limitation
of the design reactivity. The application of ADSRs to nuclear waste manage
ment is examined and the different options are discussed. Finally, some pra
ctical proposals are briefly discussed. (C) 2001 Elsevier Science B.V. All
rights reserved.