[en] An evaluation was made of the Oak Ridge Y-12 Model DT-14 shipping container to demonstrate its compliance with federal regulations as a ''Type B'' package for the interstate transportation of fissile radioactive materials. Destructive testing and engineering evaluations were made to demonstrate the structural integrity and thermal resistance of the package. It is concluded that the package meets the requirements for Fissile Class II and III shipments of uranium of any ²³⁵U enrichments. Depending on the type, form, and contained hydrogenous materials, restrictions are placed on the contained masses of ²³⁵U in each package