Status of shielding analysis methods for transport packages

Shielding analysis methods for transport packages are becoming more important to the cask designer because optimized cask designs with higher payloads can yield doses near the limits set by regulatory authorities. Uncertainty arising from generation of radiation sources; selection of cross-section data, and the radiation transport methodology must be considered. Recent comparison studies using popular U.S. codes illustrate calculational discrepancies arising from each of these areas. (author)