Aseismic Study of High Temperature Gas-cooled Reactor Core with Block-type Fuel : 3rd Report Effect of Excitation Direction and Core Support Stiffness

Abstract

A two-dimensional horizontal seismic experiment with single axis and simultaneous two-axes excitations was performed to obtain the core seismic design data on the block-type high temperature gas-cooled reactor. Effects of excitation directions and core side support stiffness on characteristics of core displacements and reaction forces of support were revealed. The values of the side reaction forces are the largest in the excitation of flat-to flat of hexagonal block. Preload from the core periphery to the core center are effective to decrease core displacements and side reaction forces.