Accelerator-driven Systems ; Their Application to the Incineration of Long-lived Radioactive Waste
Actinides, mainly responsible for the long term risk of spent fuel, are the principal candidates to transmutation due to their large absorption cross sections. <BR>Systems driven by particle accelerators have been investigated in the past to produce fissile material. Recently these systems have been reconsidered to destroy minor actinides (MA) and long-lived fission products (LLFP), reducing the need for the traditional final confinement of radioactive waste. <BR>Two Monte Carlo calculation models have been developped to determine the criticality safety conditions and the burning capability of MAs and of Pu. <BR>A Pu burner, whose core is poisoned with Th to compensate by producing <SUP>233</SUP>U the burnup reactivity due to the even Pu isotopes, can operate at a low proton current using perhaps a cyclotron, incinerating 70% of the charged Pu; its burning capability would be the production of about 1.5 PWRs. <BR>Liquid fuel accelerator driven systems can be used in the future (due to the accelerator dimensions) for MA burning using D<SUB>2</SUB>O as carrier in a homogeneous core; such a system can burn the production of more than 15 PWRs. <BR>In the future, also the problem of LLFP burning could be solved definitively using a system with D<SUB>2</SUB>O as carrier.
- Journal of nuclear science and technology
Journal of nuclear science and technology 34(2), 156-166, 1997-02-25
Atomic Energy Society of Japan