Evaluation of aseismic integrity in HTTR core-bottom structure. I: Aseismic test for core-bottom structure

Abstract The aseismic tests were carried out using 1 5 - scale and 1 3 - scale models of the core-bottom structure of the HTTR to quantitatively evaluate the response of acceleration, strain, impact load etc. The following conclusions are obtained. 1. (i) The frequency response of the keyway strain is correlative with that of the impact acceleration on the hot plenum block. 2. (ii) It was confirmed through 1 5 - scale and 1 3 - scale model tests that the applied similarity law is valid to evaluate the seismic response characteristics of the core-bottom structure. 3. (ii) The stress of graphite components estimated from the scale model test using S2-earthquake excitation was sufficiently lower than the allowable stress used as the design criterion.