Evaluation of structural integrity of metal cask due to impact of tornado missile with strain-based criteria

In Japan, Nuclear Power Plant facilities must be protected against the tornado missile impact prescribed by regulatory requirement amended in 2014. Accordingly, the evaluation of the structural integrity of dual purpose metal cask impacted by the tornado missile may be required. In the case of evaluation of dynamic phenomena of the steel structures subjected to large impact energy, strain-based criteria may be desirable. In appendices of ASME code Section III, these criteria for container of transportation and storage of radioactive material and waste are prescribed. In this study, we evaluated the structural integrity of dual purpose metal cask by these criteria, when the top of the cask was impacted by the tornado missile and compared vertical drop test condition onto a pin from 1 m height. (author)