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Title: Auxiliary analyses in support of performance assessment of a hypothetical low-level waste facility: Two-phase flow and contaminant transport in unsaturated soils with application to low-level radioactive waste disposal. Volume 2

A numerical model of multiphase air-water flow and contaminant transport in the unsaturated zone is presented. The multiphase flow equations are solved using the two-pressure, mixed form of the equations with a modified Picard linearization of the equations and a finite element spatial approximation. A volatile contaminant is assumed to be transported in either phase, or in both phases simultaneously. The contaminant partitions between phases with an equilibrium distribution given by Henry`s Law or via kinetic mass transfer. The transport equations are solved using a Galerkin finite element method with reduced integration to lump the resultant matrices. The numerical model is applied to published experimental studies to examine the behavior of the air phase and associated contaminant movement under water infiltration. The model is also used to evaluate a hypothetical design for a low-level radioactive waste disposal facility. The model has been developed in both one and two dimensions; documentation and computer codes are available for the one-dimensional flow and transport model.
Authors:
 [1] ; ;  [2]
  1. Newcastle Univ., NSW (Australia)
  2. Princeton Univ., NJ (United States). Dept. of Civil Engineering and Operations Research
Publication Date:
OSTI Identifier:
94557
Report Number(s):
NUREG/CR--6114-Vol.2
ON: TI95012814; TRN: 95:018439
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: May 1995
Research Org:
Nuclear Regulatory Commission, Washington, DC (United States). Div. of Regulatory Applications; Princeton Univ., NJ (United States). Dept. of Civil Engineering and Operations Research
Sponsoring Org:
Nuclear Regulatory Commission, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 05 NUCLEAR FUELS; LOW-LEVEL RADIOACTIVE WASTES; RADIOACTIVE WASTE STORAGE; SOILS; RADIONUCLIDE MIGRATION; STORAGE FACILITIES; PERFORMANCE; TWO-PHASE FLOW; MASS TRANSFER; SATURATION; GALERKIN-PETROV METHOD; FLOW MODELS