Spallation on heavy nuclei could constitute a promising potential neutron source, especially to obtain fast neutron flux. A trend study was undertaken to evaluate the neutronic performances of an Accelerator Driven Neutron Source (ADNS) on heavy nuclei to produce neutron flux in fast as well as in thermal energy ranges inside dedicated loops. The spectrum representativity into the loops and the level of y heat deposition was analyzed. The results showed that a 1.2 GeV proton beam of 33 mA ensure the capability to produce a neutron flux up to 6×10~(15) n cm~(-2) s~(-1) in the fast and 4×10~(15) n cm~(-2) s~(-1) in thermal spectra simultaneously on a row of loops located at 100 mm of the external edge of the window for fast and super-thermal irradiations, and 1×10~(15) n cm~(-2) s~(-1) in a second row of loops dedicated to PWR irradiations and displayed at 580 mm of the edge of the window and that without any risk of borax accident. The dpa production rate between 0.1 and 0.2 per day makes it particularly adapted to irradiations dedicated to fusion technology or aging studies of internal materials of PWR.
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