This document provides a white paper detailing required changes to the DOE Atlas railcar conceptual cradle attachment components and Phase 1 conceptual cradle design due to the addition of the HI-STAR 190 SL and XL casks to the project. 

The United States Department of Energy (DOE) is preparing for future large-scale transport of spent 
nuclear fuel and high-level radioactive waste, which are collectively defined as High-Level Radioactive 
Material (HLRM) by the Association of American Railroads (AAR). A part of this preparation includes 
designing railcars to be used for the transport of HLRM. 
 

The United States Department of Energy (DOE) is preparing for future large-scale transport of spent nuclear fuel and high-level radioactive waste, which are collectively defined as High-Level Radioactive Material (HLRM) by the Association of American Railroads (AAR). A part of this preparation includes designing railcars to be used for the transport of HLRM.