Thermal-Fluids Analyses of Model 9977 and 9975 Shipping Packages Under Normal and Hazard Analysis Conditions

The Model 9975 and Model 9977 Shipping Packages have been designed as replacements for the Department of Transportation (DOT) Fission Specification 6M package. Each shipping package consists of a 6-inch diameter Containment Vessel (6CV), a drum overpack filled with foam insulation, and a lid that also has several layers of insulation. While originally designed to ship Heat Source and RTG contents, the 9975 and 9977 shipping packages have been reanalyzed to significantly expand their Contents in support of additional Department of Energy (DOE) missions. The design and analysis details of the 9975 and 9977 packages are given in the Safety Analysis Report for Package (SARP).The Model 9977 Shipping Package is evaluated to determine the decay heat wattage that can be placed inside of two 2-quart SAVY containers held inside the package containment vessel while remaining under the thermal limits set in the 9977 SARP. These analyses determine the temperatures of components of interest during normal conditions of transport (NCT) and hypothetical accident conditions (HAC). Additionally, the Model 9975 Shipping Package is evaluated to determine the maximum O-ring temperatures under HAC using 20-year and 30-year degraded fiberboard insulation material properties.