Development of seismic isolation technology for nuclear power facilities efficacy evaluation of a Tin Rubber Bearing Isolator (SnRB)

As a part of series of 'Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities', the seismic isolation technology applied to nuclear power facilities is developed. And isolated systems applied to nuclear power facilities is based on nation's biggest Lead Rubber Bearing (LRB) with ϕ1600 mm diameter. As one of applicable isolated systems, Tin Rubber Bearing (SnRB) is adopted in the future. In this paper, the basic characteristic test of SnRB, horizontally hardening test and vertically softening test, carried out an compared with LRB. As a result, analyzing the test result about the design characteristic and non-linear characteristic at the large deformation, SnRB is evaluated the effectiveness as the alternate material of LRB. (author)