This report contains the description of a procedure for selecting scenarios that are potentially important to the isolation of high-level radioactive wastes in deiep geologic formations. In this report, the term scenario is used tolepresent a set of naturally occurring and/or humaninduced conditions that represent realistic future states of the repository, geologic systems, and ground-water flow systems that might affect the release and transport of radionuclides from the repository to humans.The scenario selection procedure discussed in this report is demonstrated by applying it to the analysis of a hypothetical waste disposal site containing a bedded-salt formation as the host medium for the repository. A final set of 12 scenarios is selected for this site.

Although the listing that follows represents the majority of documents cited In NRC publications, lt Is not intended to be exhaustive. Referenced documents avalleh!e for Inspection and copying for a fee from the NRC Public Document Room Include NRC correspondence and Internal NRC memoranda; NRC Office of Inspection and Enforcement bulletins, circulars, Information notices, Inspection and Investigation notices; Licensee Event Reports; yender reports and correspondence: Commission papers; and applicant and licensee clocurnents and correspondence. The following documents In the NUREG series are available for purc1_se from the GPO Sales Program: forma, NRC staff and contractor reports, NRC-sponsored conferanm) procoodln_, and NRC booklets and brochures. ASseavailable are Regulatory Guldes, NRC reguPaticns In the Code of Federal Regulatlons, end Nuclear Regulatory Commission Issuances. Documents available from the National Technical information 8_toe Include NUREG series reports end technical reports prepared by other federal agencies and reports prepared by the Atomic Energy Cornrrdssicn, forerunner agency to the Nuclear Regulatory Commission. Documents available from public end special technical Nbrarles Includeld open literature hems, such as books, Jotmnsl and periodical articles, and transactions. Federal Re_lster notices, federal and state leglsleticn, and confessional reports can usually be obtained from these Ibrerles.

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