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The Waste Isolation Pilot Plant A Potential Solution for the Disposal of Transuranic Waste (1996) / Chapter Skim
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C. BRINE INFLOW TO EXCAVATIONS IN THE SALADO
Pages 116-122

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From page 116...
... An alternative model in which undisturbed salt is assumed to contain brine only in unconnected porosity appears in better agreement with underground observations at WIPP. In this model, "damage"to the salt (i.e., development of the disturbed rock zone, DRZ)
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From page 117...
... ONE-DIMENSIONAL FLOW IN ANHYDRITE INTERBEDS IN IMPERMEABLE SALT The instantaneous rate of fluid inflow q, at some time I, per meter of tunnel length from a horizontal permeable layer (Figure Cal) , thickness a, and of infinite extent (one~imensional flow)
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From page 118...
... . RADIAL FLOW INTO EXCAVATIONS IN PERMEABLE SALT The Laplace transform of the instantaneous rate of inflow q into a circular opening in an infinite, homogeneous, porous medium (Figure C-5)
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From page 119...
... He calculated, numerically, the daily bnne inflow into rectangular excavations for several assumed values of hydraulic conductivity k. [For WIPP brine the intrinsic permeability ~ (m2)
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From page 120...
... With the low brine inflows calculated earlier and the associated low gas generation rates, it seems unlikely that gas pressure could approach lithostatic before the waste-fi~led excavations hac! closed to their residual (compacted)
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From page 121...
... excavated space; rate of reduction in void space due to salt creep; rate of inflow of brine into the void space; rate of gas generation and room pressurization; loss in fluid pressure due to fluid flow from the waste-fi~led rooms to the bottom of the seal, etc. Depending on the particular combination of assumed values of these variables used in a calculation, the brine pressure at the shaft bottom may remain very small for a long time after sealing or may increase after a period of the order of several hundreds of years, when gas generated by brine corrosion of the steel waste containers develops an increasing pressure in the repository.
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From page 122...
... or a total average brine pressure head of ~1 0 m. Similarly, for a seal permeability of ID m2, a total average pressure head of 1 120 m would produce a net cumulative brine outflow of 1,000 m3 in 10,000 years.
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Key Terms

  • darcy flow
  • anhydrite interbeds
  • total inflow
  • gas generation
  • pressure head

  • darcy velocity
  • anhydrite layer
  • undisturbed salt
  • void space
  • cumulative brine

  • gas pressure
  • hydraulic conductivity
  • shaft seal
  • shaft bottom
  • classical darcy

  • flow occurs
  • net cumulative
  • assumed values
  • fluid pressure
  • infinite layer

  • seal permeability
  • average pressure
  • pressure due
  • inflow rates
  • total average

  • classical model
  • marker beds
  • tested intervals
  • porous medium
  • interconnected porosity


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