Before revision: The lower fraction of delayed neutrons in the fission of compared to , which hampers the use of plutonium-containing fuels in critical reactors (which need to operate in the narrow band of neutron flux between prompt critical and delayed critical), is of no concern as no criticality of any kind is achieved or needed While nuclear reprocessing runs into the problem that MOX-fuel can not be further recycled for use in current Light Water Reactors as the reactor grade plutonium concentration of fissile isotopes is not achieved due to impurities exceeding acceptable levels, all fissile and fertile isotopes of Actinoids can be "burned" in a subcritical reactor, thus closing the nuclear fuel cycle without the need for fast breeder reactors Disadvantages Each reactor needs its own facility (particle accelerator) to generate the high energy proton beam, which is very costly.
After revision: The lower fraction of delayed neutrons in the fission of compared to , which hampers the use of plutonium-containing fuels in critical reactors (which need to operate in the narrow band of neutron flux between prompt critical and delayed critical), is of no concern as no criticality of any kind is achieved or needed While nuclear reprocessing runs into the problem that MOX-fuel can not be further recycled for use in current light-water reactors as the reactor-grade plutonium concentration of fissile isotopes is not achieved due to impurities exceeding acceptable levels, all fissile and fertile isotopes of actinoids can be "burned" in a subcritical reactor, thus closing the nuclear fuel cycle without the need for fast breeder reactors Disadvantages Each reactor needs its own facility (particle accelerator) to generate the high energy proton beam, which is very costly.