Abstract
Large numbers of graphite blocks are involved in the high-temperature gas-cooled reactor (HTGR) core. In the analysis of time history core response, integral time mesh is small so that many integral steps are necessary, because the impact vibration of the core occurs under seismic excitation and the impact between blocks is complete in several 10−3σ10−4s. Therefore, time history analysis of the core seismic response requires considerable computational cost. To reduce this cost, a simplified model for core seismic analysis is contrived. This report describes simplified modeling in the seismic response of HTGR core consisting of graphite blocks. For the model, one degree-of-freedom mass with nonlinear column characteristics is used instead of the stacked column. Results of the simplified model are compared with those of the experiment and also with a detailed analytical model. The former is in good agreement with both the experimental and the detailed model.
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