Neutronics Study On Subcritical Travelling Wave Reactor Driven By Gas Dynamic Trap Fusion Facility

The traveling wave reactor can use the movement of the breeding and burning wave to realize efficient use of 238U loaded in the reactor.It is an ideal way for the application of fission energy.In the traditional traveling wave reactor,in order to maintain the movement of the breeding and burning wave,the radiation of the fuel assembly is far more than the allowable limit of the current material,which makes it difficult to realize.With the driven of the external neutron source the traveling wave reactor can reduce the radiation of the material to a certain extent and realize the function of the traveling wave reactor.It can realize the high fuel utilization and the inherent safety of the subcritical,which is of great significance to the sustainable development of nuclear energy.In this thesis,a subcritical traveling wave reactor based on the gas dynamic trap fusion neutron source was proposed.Through the regulation of the neutron source position,the movement of the breeding and burning wave was promoted to realize the function of the traveling wave reactor.The main contents included:The design scheme of using fusion neutron source based on Gas Dynamic Trap to drive a subcritical traveling wave reactor was proposed.The active adjustment of the neutron source could be realized by adjusting the magnetic field intensity distribution and the neutral beam injection position,which could be used to drive the sub-critical traveling wave reactor and realize the function of the traveling wave reactor.Then the basic composition,physical principle and neutronics characteristics of the subcritical travelling wave reactor driven by gas dynamic trap fusion facility were described.Based on the neutronics design objectives and principles and reference of lead cooled traveling wave reactor,the influence of different key parameters on core neutronics performance was analyzed by using the Monte Carlo program SuperMC and kernel evaluation database HENDL.The results showed that the subcritical traveling wave reactor had better neutronics performance with U-10%Zr metal fuel enrichment of 12%and 208Pb as coolant and reflector.When the initial position of the neutron source was in the range of 20-100 cm and the moving speed was 5 cm/a,it had the best performance when matched with the burning and breeding wave of the subcritical traveling wave reactor.By means of numerical simulation,the neutronics transient safety analysis of lead-cooled subcritical travelling wave reactor was carried out,mainly focusing on the subcritical core reactivity introduction and the external neutron source disturbance.The results showed that a certain period of time after the disturbance,the system neutron source strength requirements,core keff,neutron flux distribution,power distribution,and the fissile nucleus density distribution had all returned to stable conditions.Compared to before the disturbance,the parameters after the disturbance remained basically the same.In summary,this thesis proposed a design scheme of lead-cooled subcritical travelling wave reactor driven by gas dynamic trap fusion facility.The preliminary neutronics design of lead-cooled subcritical travelling wave reactor has been completed through the neutronics optimization and analysis.On this basis,the neutronics transient safety analysis of lead-cooled subcritical travelling wave reactor was carried out,which provided a reference for the safety design and analysis of the subcritical travelling wave reactor.