Brittle Fracture Tests at Low Temperature for Transport Cask Materials*

The lAEA Regulations for the Safe Transport of Radioactive Material were revised in 1985, and brittle fracture assessment at low temperature for transport packages are now required. Several proposals for an international method for brittle fracture assessment of transport packages have been discussed at the lAEA Specialist Meeting. Japan also proposed a method at this meeting. Type- B transport casks required brittle fracture assessment, and the cask body and bolt materials which comprise sealing systems are made of many types of materials, including ferritic carbon steel, austenitic stainless steel, and ductile cast iron. Accordingly, in practical assessment, the method should be checked for each material. This report discusses the more pr actical method for brittle fracture assessment to type -B transport cask materials used in Japan.