A. Polanski

Mathematical investigation of a possibility of increase in power of the subcritical assembly in Dubna (SAD) up to 100 kW

Results of Monte Carlo modeling of the experimental accelerator-driven electronuclear system composed of the subcritical assembly and the phasotron of the Dzhelepov Laboratory of Nuclear Problems of the Joint Institute for Nuclear Research are presented. The design thermal power of the subcritical assembly in Dubna (SAD) is equal to 30 kW. A possibility of increasing the assembly power without changing its design and basic components is considered. The proposed upgrade of the installation provides a power increase of up to 100 kW and is based on operations available both before and after the installation is brought to operation at the nominal power with partial fulfillment of the experimental program.

Theoretical and Experimental Research in Neutron Spectra and Nuclear Waste Transmutation on Fast Subcritical Assembly with MOX Fuel

The paper deals with theoretical and experimental investigation of transmutation rates for a number of long‐lived fission products and minor actinides, as well as with neutron spectra formed in a subcritical assembly driven with the following monodirectional beams: 660‐MeV protons and 14‐MeV neutrons. In this work, the main objective is the comparison of neutron spectra in the MOX assembly for different external driving sources: a 660‐MeV proton accelerator and a 14‐MeV neutron generator. The SAD project (JINR, Russia) has being discussed. In the context of this project, a subcritical assembly consisting of a cylindrical lead target surrounded by a cylindrical MOX fuel layer will be constructed. Present conceptual design of the subcritical assembly is based on the core with a nominal unit capacity of 15 kW (thermal). This corresponds to a multiplication coefficient, keff= 0.945, and an accelerator beam power of 0.5 kW. The results of theoretical investigations on the possibility of incinerating long‐lived...