Il codice botanico di Augusto. Roma, Ara pacis: parlare al by Giulia Caneva

By Giulia Caneva

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The only nuclear process which is employed is the natural radioactive decay. g. actinides). The treatment of the products needs to apply an adequate technology in an adequate scale. This principle has not been applied and fulfilled in those so far developed and designed systems for spent solid fuel management. There is an adequate technology which only utilizes nuclear processes and which can transfer the high level and long-lived radionuclides towards short-lived or even stable nuclides-transmutation technology performed in a suitable nuclear reactor device and combined with a continuous separation of certain components of its core or reprocessing of the reactor fuel so as to avoid the consequent induction of radioactivity by neutron irradiation of stable and short-lived nuclides.

G. centrifuge) separation of individual components of the fluid fuel and has also a higher thermal efficiency. Therefore, we will concentrate in our further analysis and a development of a design concept on such a type of systems. 3. 1. The Los Alamos Molten Fluoride Salt Fuel for AcceleratorDriven Transmutation Technology (ADTT) The LANL concept of an accelerator-driven subcritical blanket for a nuclear incineration of nuclear waste has been known for several recent years [lj|. Let us recall at least very briefly the main features of the last developed version of this concept and let us show a part of a proposed research program of an approvement of its ability for an efficient realization in the industrial scale.

This evolution is governed by ^OTh decay (periods of 80000 years), and by the unextracted uranium after 106 years. One observes that, whatever the origin of the Th ore is its mining residues show a much smaller radiotoxicity a factor than the corresponding one for uranium extraction by a factor bying between 20 to 50. In conclusion, thorium extraction shows less long term radiological burden than uranium extraction, in terms of: - radon exhalation ; - long term residues radiotoxicity. The differences depend on the amount of uranium mixed with the thorium ore, and on the economical decision to extract or not the accompanying uranium, together with thorium.

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