Transient diffusion from a waste solid into water-saturated, fractured porous rock

Conference · Fri Sep 01 04:00:00 EDT 1989

OSTI ID:7013414

Ahn, J ^[1]; Chambre, P L; Pigford, T H; Lee, W W.-L. ^[2]

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1. Tokyo Univ. (Japan)
2. Lawrence Berkeley Lab., CA (USA)

Numerical illustrations for transient mass transfer from an infinitely long cylinder intersected by a planar fracture are shown based on Chambre's exact analytical solutions. The concentration at the cylinder surface is maintained at the solubility. In the fracture contaminant diffuses in the radial direction. In the rock matrix three-dimensional diffusion is assumed in the cylindrical coordinate. No advection is assumed. Radioactive decay and sorption equilibrium are included. Radioactive decay enhances the mass transfer from the cylinder. Due to the presence of the fracture, the mass flux from the cylinder to the rock matrix becomes smaller, but the fracture effect is limited in the vicinity of the fracture in early times. Even though the fracture is assumed to be a faster diffusion path than the rock matrix, the larger waste surface exposed to the matrix and the greater assumed matrix sorption result in greater release rate to the matrix than to the fracture. 8 refs., 4 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7013414
• Report Number(s): LBL-27401; CONF-891008--5; ON: DE90007769
• Country of Publication: United States
• Language: English

Related Subjects

052002* -- Nuclear Fuels-- Waste Disposal & Storage
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CYLINDERS
DECAY
DIFFUSION
FAILURES
FRACTURES
ISOTOPES
MASS TRANSFER
MATERIALS
MATHEMATICAL MODELS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
RADIOISOTOPES
ROCKS
WASTE FORMS
WASTES