Structural Integrity Analysis of MSF Transportable Storage Casks based on Test Results used full-scale and 1/2.5-scale Model

Transportable storage casks for spent fuels are able to be used for transport of spent fuels from nuclear power plants to an interim storage site, and used for storage at the site. Integrities of containment system, shielding system and subcriticality system during transport have to be demonstrated by drop tests and/or numerical simulations in accordance with IAEA transport regulations SSR-6.Structural integrities of “MSF transportable storage casks fleet” are verified by numerical simulations based on the drop tests with full-scale model and 1/2.5 scale model, and static tests of shock absorbers.The load-displacement characteristics were obtained by the static element tests of woods. The decelerations and strains at the body and lids were obtained by the drop tests. A numerical simulation tool was developed to evaluate dynamic behavior of the cask body especially behavior at lid parts. The structural integrities of different type casks of MSF-21P and MSF-52B were confirmed with applying the developed simulation tool.This paper describes outline of MSF cask and structural design of MSF cask validated by test results and the numerical simulation tool.