Multi-Wall Cask Advantages with Quarter-Scale Model Drop Test Results for the NAC-STC Storable Transport Cask

Engineers are challenged with a multitude of variables influencing their success in achieving optimum disposition of commercially generated spent nuclear fuel. Safety is the most important objective in obtaining universal acceptance. However, following this central theme, design considerations become complicated by a web of interdependent parameters. Design variables are evaluated as functional components of the design process and are assessed with respect to current industry application and regulatory acceptance. Public safety issues related to the disposition of nuclear waste are the designer's greatest concern. Public acceptance is critical for utilities to assure control of cost and schedule of any activity affected by licensing and public review. In addition, government regulatory organizations are chartered with the responsibility to protect the public and, therefore, only consider fully engineered systems having documented qualification records. This design process and focus have formed the bases of the dual-purpose NAC-STC (Storable Transport Cask), currently under license review by the USNRC. Physical drop test results for a quarter-scale model multi-wall cask are presented for the 9 meter end, side and oblique drops with impact limiters, and for the 1 meter side and closure lid pin puncture drops. Lessons learned and fmal cask test qualification are presented.