Focused mined geologic disposal system (MGDS) repository design for the Yucca Mountain Project

This paper outlines a refined design process which will successfully manage Yucca Mountain Project repository design efforts while meeting regulatory and programmatic requirements. Pending changes in the program technical baseline as well as limited resources reflect the program`s emerging trend to manage technical and programmatic risks associated with the selection of key assumptions. The decision to utilize a Multiple Purpose Canister (MPC), one of many waste package concepts currently being considered, has promulgated a revised Mined Geologic Disposal System (MGDS) design approach. The key elements are: (1) develop MGDs design concepts which fulfills the technical and programmatic requirements; (2) adopt a design approach which uses management assumptions based on available information and expert engineering and scientific judgment now; (3) substantiate the assumptions as the design is developed; and (4) carry alternative design features which are important to safety and/or waste isolation. Advantages and constraints are discussed.