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Heated mine room and pillar secondary creep response

Description: Heated salt mine room and pillar simulations have been performed to provide information regarding parameters affecting room closure rates to designers of radioactive waste isolation facilities. A coupled secondary creep and heat transfer formulation with large strain capabilities was used to assess the effects of variations in creep law parameters, thermal properties, imposed boundary conditions, temporal integration, and meshing resolution on room closure rates. Results indicate that the greatest effect results from variations in parameters appearing in the creep constitutive equation.
Date: April 1, 1980
Creator: Tillerson, J.R. & Dawson, P.R.
Partner: UNT Libraries Government Documents Department

Thermoelastic capabilities for the SANDIA--BMINES program

Description: The capability for simulating the thermoelastic behavior of geologic media has been added to the SANDIA-BMINES finite element code. The equations governing the response of a continuum to a known temperature field are delineated in this report. In addition, the specifics of the implementation of the continuum equations into the existing finite element program are described. Finally, the results of validation studies performed to assess the accuracy of the modified program are presentd along with recommendations concerning future research and development efforts in this field.
Date: February 1, 1978
Creator: Tillerson, J.R. & Madsen, M.M.
Partner: UNT Libraries Government Documents Department

Nuclear waste canister thermally induced motion. [In salt]

Description: The movement of canisters containing heat producing nuclear wastes has been analyzed using a single canister model in a salt environment. Steady state and transient analyses both indicate that only minimal canister movement will result from buoyancy of heated salt.
Date: June 1, 1978
Creator: Dawson, P.R. & Tillerson, J.R.
Partner: UNT Libraries Government Documents Department

Dynamic compaction of salt: Initial demonstration and performance testing

Description: Reconsolidated crushed salt is proposed as the sole long-term shaft seal between the Waste Isolation Pilot Plant (WIPP) and the biosphere. The concept for a long-term shaft seal for the WIPP repository is to place crushed salt in the four shafts and to develop an effective seal as the surrounding salt creeps into the shafts, reconsolidating the salt. Permeability of the salt components is calculated to achieve performance objectives at some acceptable time in the future, an expectation which is a key to performance assessment calculations for the WIPP. Such a seal has never been constructed, and until now no performance measurements have been made on an appropriately large scale. A full understanding of construction methods, achievable initial density and permeability and time-wise performance of reconsolidating salt is required. This paper discusses nearly full-scale dynamic compaction of mine-run WIPP salt, preliminary measurements of density and permeability, and their variability within a relatively large volume of compacted material
Date: December 31, 1994
Creator: Hansen, F.D.; Ahrens, E.H.; Tidwell, V.C.; Tillerson, J.R & Brodsky, N.S.
Partner: UNT Libraries Government Documents Department

A shaft seal system for the Waste Isolation Pilot Plant

Description: As part of the demonstration of compliance with federal regulations, a shaft seal system has been designed for the Waste Isolation Pilot Plant. The system completely fills the 650 m shafts with components consisting of the common engineering materials, each of which possesses low permeability, longevity, and can be constructed using available technology. Design investigations couple rock mechanics and fluid flow analysis and tests of these materials within the natural geological setting, and demonstrate the effectiveness of the design.
Date: July 1, 1996
Creator: Hansen, F.D.; Ahrens, E.H.; Dennis, A.W.; Hurtado, L.D.; Knowles, M.K.; Tillerson, J.R. et al.
Partner: UNT Libraries Government Documents Department