The High Temperature Gas-cooled Reactor (HTGR) developed by the General Atomic Co. of U.S.A. is a nuclear reactor with high performance. The active core in case of large HTGR (1, 100 MWe) is made up of fuel graphite blocks (about 8, 000 blocks in total), all of which are stacked horizontally with a 4 mm clearance between each block. If an earthquake should occur, intricate behaviors due to collisions result as a great number of the blocks collide against one another.
The present report is concerned with the two-dimensional vibration test of a vertical slice of the core and the computer simulation analyses. Namely, selecting a vertical slice across the center of the core, the forced vibration test of a 1/5 scale model was performed by using a shaking table to obtain such dynamic properties as resonant characteristics and vibration modes of the core. Together with the test, a computer code called COLLAN2-V was developed to simulate the test results. Consequently, it was clarified that the collision behaviors of the core could be analyzed by the computer.
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