Closed Fuel Cycle System for the FBR Transition from LWR

The transition scenario from LWR to FBR is investigated and the Flexible Fuel Cycle Initiat ive (FFCI) is proposed. The FFCI removes most uranium from LWR spent fuel in LWR reprocessing, and residual material is treated in FBR reprocessing to recover Pu/U or stored temporarily according to the FBR deployment rate. The FFCI has some merits compared with ordinary system which consists of full reprocessing of both LWR and FBR spent fuels; that is better economy, concentrated Pu supply to FBR reprocessing, high proliferat ion resistance, and flexibility to uncertain transition factors like FBR deployment rate changes.