Real-Time Simulation Research On Experimental Fast Reactor Core Physics

As the advanced fourth generation reactor, fast reactor has more fissile nuclides proliferation and more resource utilization of uranium. At the same time, fast reactor could realize transmutation of minor actinides in thermal reactor and it has favorable safety. So fast reactor is ensure of sustainable development of nuclear energy. Simulation technology has characteristics of safety, economic and efficient and has been widely used in the field of nuclear energy. It could provide economic research method for operation of reactor and personnel training. However, research of simulation technology about fast reactor is much less in the domestic. This dissertation carries out Real-Time Simulation Research on Chinese Experimental Fast Reactor Core Physics.First, the core physics real-time simulation model for Experimental Fast Reactor Core Physics is established. Multi-group neutron diffusion space-time dynamics equations,amplitude function calculation equations, toxic calculation equations and reactive calculation equations and power calculation equations are included in the real-time simulation models.The models are solved by using coarse mesh finite difference method. Neutrons flux is decomposed into the shape function and the amplitude function by using the improved quasi-static approximation. The method simplifies the equation calculations. Shape function is solved by using the improved Alternative Direction Implicit (ADI) method and the amplitude function is solved by using the point reactor kinetics equations. The different methods of the leakage of Multi-group neutrons diffusion time-space dynamics equation with the hexagonal fuel assembly has been also derived and discussed.Secondly, this dissertation establishes two-dimension model for Experimental Fast Reactor Core Physics with HELIOS. Cross sections with multiple work conditions are provided by the models. Fuel temperature.coolant temperature and burnup are taken into consideration to calculate cross-sections. So this dissertation analyses the table lookup method and fitting method on generating cross-sections parameters. Because of the work amount,fitting method is finally chosen to generate cross-sections in the code. Fitting formulas are verified in this paper.Finally, this dissertation simulates Chinese Experimental Fast Reactor Core Physics with the established models and numerical solutions and compares the results with the parameters in the safety report of Chinese Experimental Fast Reactor. The results reveal that the simulation model and the numerical solution can satisfy the requirement of engineering accuracy and simulation speed.