Summary of four release consequence analyses for hypothetical nuclear waste repositories in salt and granite

Technical Report · Mon Dec 01 04:00:00 EST 1980

DOI:https://doi.org/10.2172/6713005· OSTI ID:6713005

Cole, C R; Bond, F W

Release consequence methology developed under the Assessment of Effectiveness of Geologic Isolation Systems (AEGIS) program has now been applied to four hypothetical repository sites. This paper summarizes the results of these four studies in order to demonstrate that the far-field methodology developed under the AEGIS program offers a practical approach to the post-closure safety assessment of nuclear waste repositories sited in deep continental geologic formations. The four studies are briefly described and compared according to the following general categories: physical description of the repository (size, inventory, emplacement depth); geologic and hydrologic description of the site and the conceptual hydrologic model for the site; description of release scenario; hydrologic model implementation and results; engineered barriers and leach rate modeling; transport model implementation and results; and dose model implementation and results. These studies indicate the following: numerical modeling is a practical approach to post-closure safety assessment analysis for nuclear waste repositories; near-field modeling capability needs improvement to permit assessment of the consequences of human intrusion and pumping well scenarios; engineered barrier systems can be useful in mitigating consequences for postulated release scenarios that short-circuit the geohydrologic system; geohydrologic systems separating a repository from the natural biosphere discharge sites act to mitigate the consequences of postulated breaches in containment; and engineered barriers of types other than the containment or absorptive type may be useful.

• Research Organization: Battelle-Northwest, Richland, WA (USA). Pacific Northwest Lab.
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6713005
• Report Number(s): PNL-3548
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
58 GEOSCIENCES
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A CODES
CLOSURES
COMPUTER CODES
DISSOLUTION
DOSES
ENVIRONMENTAL TRANSPORT
FISSION PRODUCT RELEASE
FLOW MODELS
GEOLOGIC DEPOSITS
GEOLOGY
GRANITES
HYDROLOGY
IGNEOUS ROCKS
LEACHING
MANAGEMENT
MASS TRANSFER
MATHEMATICAL MODELS
NUCLEAR FACILITIES
PLUTONIC ROCKS
RADIATION DOSES
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTE FACILITIES
RADIONUCLIDE MIGRATION
RISK ASSESSMENT
ROCKS
SALT DEPOSITS
SEPARATION PROCESSES
UNDERGROUND DISPOSAL
WASTE DISPOSAL
WASTE MANAGEMENT