In the case of impact analysis to verify structural integrity of existing steel structures of nuclear power plants (NPPs) against tornado missiles, one of the strain-base criteria regarding aircraft impact on NPPs described by US Nuclear Energy Institute is currently used. However, the technical bases for this methodology are not disclosed. In this report, to clarify a way to decide the response values and the penetration conditions for a steel plate when a tornado missile crashes steel plate and verify an accuracy of design methodologies, impact tests with the pipe shaped missile of 50mm diameter and 4mm wall thickness were executed at impact velocity 49m/s.
