The future
development of Fission Reactors
and their fuel cycles
G. Kessler
retired from the former
Institute for Neutron Physics
and Reactor
Technology
Forschungszentrum Karlsruhe
Abstract
The present technology of Light Water Reactors
(LWRs), Heavy Water Reactors (HWRs, CANDUs) and High Temperature Gas Cooled
Reactors (HTRs) as well as Fast neutron Reactor (FRs) or Accelerator Driven
Systems (ADSs) will be further developed with regard to their fuel burnup, to
their safety concept and to their fuel cycle concept. Presently dominating LWRs
and CANDUs are
operated with intermediate storage and direct disposal of their
spent fuel element (open fuel cycle in
Research on actinide incinerations will lead to
fuel cycle options with fuel elements containing - together with uranium or
thorium - fissile isotopes like U-233, U-235, and transuranium elements (TRUs)
like plutonium, neptunium, americium with similar
enrichments as present low enriched (U-235) fuel elements. Such fuel cycle
options offer also improvement of their proliferation resistance.
FRs and ADSs with a closed fuel cycle are more
efficient in destroying actinides than present thermal converter reactors (LWRs
etc.). Although they were built and operated already in small numbers in