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BUFFER_EROSION_COPPER_CORROSION

Specifies the properties for the buffer erosion/copper corrosion card. The model is documented in Park et al. (2024).

The following cards must be specified in the WASTE_FORM block:

FRACTURE_ANGLE <float>

Angle of largest fracture intersecting borehole.

FRACTURE_APERTURE <float>

Aperture of largest fracture intersecting borehole.

WATER_VELOCITY <float>

Water velocity across borehole.

ION_CONCENTRATION <float>

Salinity of groundwater at borehole location.

Example

WASTE_FORM
  REGION wp
  EXPOSURE_FACTOR 1.0d+0
  VOLUME 1.0d+0 m^3
  MECHANISM_NAME csnf
  FRACTURE_ANGLE 1.5708
  FRACTURE_APERTURE 0.0001
  WATER_VELOCITY  41
  ION_CONCENTRATION 1.946
/

Required Cards

BOREHOLE_RADIUS <float>

Radius of the borehole.

BUFFER_POROSITY <float>

Porosity of the buffer.

CANISTER_RADIUS <float>

Radius of the canister.

CANISTER_WALL_THICKNESS <float>

Thickness of the canister wall.

REACTANT_CONC_HS <float>

Reactant concentration.

Optional Cards:

SMECTITE_PARTICLE_DENSITY <float>

Buffer grain density. Default value [2700 kg/m³].

DIFF_COEF_IN_BH <float>

Diffusion coefficient in borehole. Default value 1d-9 [m²/s].

SMECTITE_VOL_FRAC_BH_INT <float>

Smectite volume fraction in borehole initially. Default value 0.574.

SMECTITE_VOL_FRAC_AT_RIM <float>

Smectite volume fraction at intuding rim. Default value 0.015.

Y0 <float>

Time-dependent empirical exponent y₀ for total buffer extruded over time. Default value 93.74.

Y1 <float>

Time-dependent empirical exponent y₁ for total buffer extruded over time. Default value -0.0004521.

Y2 <float>

Time-dependent empirical exponent y₂ for total buffer extruded over time. Default value 2.236d-9.

CI_UPPER_BOUND <float>

Salinity threshold above which no buffer is eroded. Default value 4 mM.

CI_LOWER_BOUND <float>

Salinity lower bound for smectite diffusivity calculation. Default value 0.1 mM.

SEDIMENT_RELEASE_CONSTANT <float>

Experimentally determined sedimentation rate. Default value 1000 [kg/m³].

AGGLOMERATE_FLUID_VISCOSITY <float>

Viscosity of agglomerate fluid. Default value 0.1 [Pa-s]

AF_DENSITY <float>

Density of agglomerate fluid. Default value 1017 [kg/m ³].

AF_VOL_DEN <float>

Volume density of agglomerate fluid. Default value

F1 <float>

Volume multiplier to critical volume of buffer loss to expose copper. Default value 1.

CANISTER_DENSITY <float>

Density of canister material. Default value 8900 [kg/m³].

MW_CANISTER_METAL <float>

Molecular weight of canister material. Default value 63.54 [g/mol].

MW_REACTANT <float>

Molecular weight of corroding agent. Default value 33.07 [g/mol].

METAL_TO_RECTANT_RATIO

Stoichiometric ratio of corroding agent to corroding metal. Default value 2.

EXPOSED_SURFACE_MULTIPLIER

Exposed surface multiplier to area of copper exposed after buffer erosion. Default value 1.

Example

CANISTER_DEGRADATION_MODEL
  CANISTER_MATERIAL_CONSTANT 1500.
  BUFFER_EROSION_COPPER_CORROSION
    BOREHOLE_RADIUS 0.925
    BUFFER_POROSITY 0.35
    CANISTER_RADIUS 0.525
    CANISTER_DENSITY 8900
    REACTANT_CONC_HS 1.21d-4
  /
/