Proposed Concrete Shaft Liner Design Method for an Underground Nuclear Waste Repository.

摘要

General requirements and performance objectives for nuclear waste repository shafts (operational safety and waste retrievability) are defined in 10 CFR 60.133 (NRC, 1988). The Generic Requirements Document (DOE, 1986) interprets and expands these requirements into more specific functional requirements for liners of these shafts, including structural integrity, provisions for attaching shaft fittings, and water control. These requirements also apply to the exploratory shafts used for site characterization because they may later be used in the repository. Cast-in-place concrete liners are excellent for vertical shafts, providing security from rockfalls, convenient attachment of shaft equipment, low resistance to ventilation airflow, and protection of the wall rock from weathering. Concrete-lined shafts are planned for the proposed waste repository in Nevada. To meet repository licensing requirements, a design methodology for liners must be developed that considers the effects of induced thermal and seismic loads on the liner in the context of repository performance requirements. The major steps of a proposed methodology are outlined in this paper. 8 refs., 2 figs.