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Conference Article: Seismic response analysis of Rapsodie core mock-up in water experiment

Morishita, M. (Power Reactor and Nuclear Fuel Development Corp., Oarai, Ibaraki (Japan). Oarai Engineering Center)

Abstract

In the framework of the Coordinated Research Program on “Intercomparison of LMFBR Seismic Analysis Codes” organized by IAEA/IWGFR, a series of dynamic and seismic response analyses was performed on the RAPSODIE core mock-up experiment. The experiment was shaking table tests using up to 271 full size mock-up elements of RAPSODIE core. The analysis was made on the in-water experiment with a nineteen element single row model (central row) and a 3-D half cluster model. Prior to the response analysis, fluid added mass was evaluated based on theory and a parametric FE analysis, which affect the dynamic property and apparent excitation characteristics of the core-vessel system through dynamic fluid-structure interaction. Using the added mass, the seismic response analysis with the single row model gave fairly close responses to those measured in the experiment. Based on the comparison of analysis results with experimental data in terms of maximum displacement distribution, displacement time history, and acceleration response spectra, it was judged that the present analysis gave good results within a reasonable accuracy for practical purposes. The 30 half cluster model, which contain a total of 145 elements in the upper half of the whole core and is an inexperienced large scale analysis so far, gave less accurate results compared with the single row model. There seems to be a room for refining this large scale 30 model.

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key words: computer codes; experimental data; fluid-structure interactions; mockup; rapsodie reactor; reactor cores; response functions; seismic effects; theoretical data
Reference:
Final research co-ordination meeting on intercomparison of liquid metal fast reactor seismic analysis codes. Bologna (Italy). 30 May - 2 Jun 1995
International Atomic Energy Agency, Vienna (Austria)
IAEA-TECDOC--882, pp:37-58