EVALUATION OF ASEISMIC INTEGRITY IN HTTR CORE-BOTTOM STRUCTURE .1. ASEISMIC TEST FOR CORE-BOTTOM STRUCTURE

The aseismic tests were carried out using 1/5-scale and 1/3-scale mode ls of the core-bottom structure of the HTTR to quantitatively evaluate the response of acceleration, strain, impact load etc. The following conclusions are obtained. (i) The frequency response of the keyway str ain is correlative with that of the impact acceleration on the hot ple num block. (ii) It was confirmed through 1/5-scale and 1/3-scale model tests that the applied similarity law is valid to evaluate the seismi c response characteristics of the core-bottom structure. (ii) The stre ss of graphite components estimated from the scale model test using S2 -earthquake excitation was sufficiently lower than the allowable stres s used as the design criterion.