Rudychev Y. The radiation fields simulation and optimization of radiation sources

The thesis is devoted to simulation of necessary characteristics of radiation fields of complex physical objects to make reasonable choices of optimal operational parameters such objects at the design stage and ensuring nuclear and radiation safety ones during operation. The techniques and programs designed for the efficient simulation of radiation fields of neutrons and gamma rays, and activation characteristics for next objects: neutron source target of high intensity source, dry storage container for spent nuclear fuel and for transmutation system of spent nuclear fuel. The simulation of radiation fields of neutrons and gamma rays of neutron source target, which would allow optimization of the parameters of neutron source target, provides the maximum yield of neutrons with the characteristics of the subcritical assembly. Dose rates and activation parameters of neutron source target was calculated. The simulation of radiation fields of gamma-ray dry storage container of spent nuclear fuel which makes it possible to study the dependence of the spectral and angular distributions of gamma rays outside of the container DSSNF on the characteristics of spent fuel. Radiation doses on the surface of the container on the characteristics of spent nuclear fuel were calculated. The activation and transmutation of spent nuclear fuel was calculated by simulation for various configurations of the location and composition of the waste by neutrons irradiation of RW. The main parameters affecting the efficiency of the transmutation of radioactive waste were found. Options for improving the efficiency of the transmutation of radioactive waste by optimizing the parameters of the SNF were considered.