Numerical simulation of sloshing behavior in the fast breeder reactor caused by the seismic force

When the fluid machinery having free liquid surface are excited by earthquakes and other external force, the free liquid surface oscillates, and stress is applied to structures accompanying it. The program which can analyze this oscillation phenomena of free liquid surface and the stress of structures was developed. In this program, boundary element method is applied to the analysis of the flow having free liquid surface, and finite element method is applied to the deformation analysis of structures. By coupling the equations for fluid and a structure on the boundary, the compound analysis of fluid and a structure was made feasible. By the numerical simulation on large scale using a super-computer HITAC S-820, the oscillation phenomena of coolant in a fast breeder reactor at the time of earthquakes were analyzed. From the viewpoint of shortening the period of product development and reducing development cost, the technology which can analyze these phenomena by numerical simulation has been strongly desired. The outline of the analysis technology, and the comparison of the sloshing characteristics in single liquid surface type and multiple liquid surface type reactors are reported. (K.I.)