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The Suitability of Palestine Salt Dome, Anderson Co., Texas for Disposal of High-level Radioactive Waste
The suitability of Palestine salt dome, in Anderson County, Texas, is in serious doubt for a repository to isolate high-level nuclear waste because of abandoned salt brining operations. The random geographic and spatial occurrence of 15 collapse sinks over the dome may prevent safe construction of the necessary surface installations for a repository. The dissolution of salt between the caprock and dome, from at least 15 brine wells up to 500 feet deep, may permit increased rates of salt dissolution long into future geologic time. The subsurface dissolution is occurring at a rate difficult, if not impossible, to assess or to calculate. It cannot be shown that this dissolution rate is insignificant to the integrity of a future repository or to ancillary features. The most recent significant collapse was 36 feet in diameter and took place in 1972. The other collapses ranged from 27 to 105 feet in diameter and from 1.5 to more than 15 feet in depth. ONWI recommends that this dome be removed from consideration as a candidate site.
Simulation of a Bench Scale Experiment with an Empirical Creep Law
A priori predictions of the creep behavior of a planned bench scale experiment are presented. The experiment involves uniaxial loading of a large block of natural salt with a centrally located borehole. Primary measurements will include the borehole deformation. Sixteen material characterizations including four sets of elastic constants and four empirical creep power laws are developed from one standard deviation of the laboratory derived material properties and are used in the finite element simulation. Consideration is given to plane stress and plane strain solutions and to time-hardening and strain-hardening forms of the creep law. The results show that the deformations are relatively insensitive to variations in the elastic properties and very sensitive to the power on time in the empirical creep law. Differences in the results for the time-hardening and strain-hardening creep formations are small relative to the differences associated with varying the material parameters.
