Numerical Studies On Impact Tests Of A Full-size
Metal Storage Cask
Author(s)
N. Kageyama & K. Shirai
Abstract
The necessity of the interim dry storage of nuclear spent fuel using metal casks
has risen year by year. Metal gaskets have been used worldwide to prevent leaks
from the metal cask during long-term storage. There are still uncertainties for the
impact behaviours of the metal cask without impact limiters under severe impact
loads, such as drop or tipping-over events in the interim storage facility.
Therefore, it is very important to clarify the dynamic behaviour of the metallic
gaskets subjected to sliding and opening movements of the lid structures during
impact loads.
To demonstrate the structural integrity and leak-tightness of gasketed joints of
the metal cask against drop impacts, many impact tests and analysis have been
performed based on transport regulations or storage accident scenarios. The inert
gas will be released instantaneously under very slightly opening or sliding
movements of the lid structures. Until now, there has been less evaluation data
concerning the instantaneous leak rates from the lid gasket during impact
loading.
Therefore, two impact tests with the full-size metal cask (horizontal drop and
rotational impact onto concrete floor) have been executed and the relationships
between gasket movements and the leak rate of inert gas have been clarified.
Moreover, according to the drop analysis using dynamic analysis code
LS-DYNA and the comparison with the experimental results, the impact
behaviour of the complicated gasketed joints can be simulated accurately and
directly.
Keywords: interim dry storage, metal storage cask, lid gasket and LS-DYNA.
Keywords
interim dry storage, metal storage cask, lid gasket and LS-DYNA.
Related Book
Other papers in this volume
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