The INP (Kazakhstan) activity in the field of accelerator-driven subcritical reactors

Experimental works have been performed to provide information data on radiation resistant properties of structural materials, fission cross sections, and angular distributions of fragments, all of which can be used for development and design of ADS. New results have been obtained on alterations in structure, short-time mechanical properties, and swelling for structural materials irradiated in the fast reactor BN-350. It was found that the main contribution in nuclide production in a thick spallation target of ADS is conditioned by the evaporation residues and the fission of target nuclei in the reactions with secondary nucleons with energies less than those of primary protons. In connection with this experimental work, a new method for calculation of fragment mass distributions from fission of pre actinide compound nuclei at excitation energy up to 70 MeV has been developed. A modal approach has been applied to obtain physically adequate description of these nuclei fission cross sections and angular distributions of fragments in a wide range of incident nucleon energies. (author)