Waste isolation pilot plant disposal room model
01 Aug 1997-
TL;DR: In this article, the conceptual and mathematical models for the part of the Waste Isolation Pilot Plant (WIPP) performance assessment that is concerned with what happens to the waste over long times after the repository is decommissioned are described.
Abstract: This paper describes development of the conceptual and mathematical models for the part of the Waste Isolation Pilot Plant (WIPP) repository performance assessment that is concerned with what happens to the waste over long times after the repository is decommissioned. These models, collectively referred to as the {open_quotes}Disposal Room Model,{close_quotes} describe the repository closure process during which deformation of the surrounding salt consolidates the waste. First, the relationship of repository closure to demonstration of compliance with the Environmental Protection Agency (EPA) standard (40 CFR 191 Appendix C) and how sensitive performance results are to it are examined. Next, a detailed description is provided of the elements of the disposal region, and properties selected for the salt, waste, and other potential disposal features such as backfill. Included in the discussion is an explanation of how the various models were developed over time. Other aspects of closure analysis, such as the waste flow model and method of analysis, are also described. Finally, the closure predictions used in the final performance assessment analysis for the WIPP Compliance Certification Application are summarized.
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01 Jan 1998
4 citations
Cites background or methods from "Waste isolation pilot plant disposa..."
...9 A computer model was developed (Butcher 1997) to estimate the compaction and decrease in the pore volume of the compacted waste....
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...Areal View of the Underground WIPP Facility (U.S. DOE 1996) 9 A computer model was developed (Butcher 1997) to estimate the compaction and decrease in the pore volume of the compacted waste....
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...8 The closure process of the salt begins as soon as the rooms are excavated and continues until an equilibrium state of the rock and the waste are reached (Butcher 1997)....
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01 Aug 1997
TL;DR: A summary of the input parameter values used in final predictions of closure and waste densification in the Waste Isolation Pilot Plant disposal room is presented, along with supporting references in this paper.
Abstract: A summary of the input parameter values used in final predictions of closure and waste densification in the Waste Isolation Pilot Plant disposal room is presented, along with supporting references. These predictions are referred to as the final porosity surface data and will be used for WIPP performance calculations supporting the Compliance Certification Application to be submitted to the U.S. Environmental Protection Agency. The report includes tables and list all of the input parameter values, references citing their source, and in some cases references to more complete descriptions of considerations leading to the selection of values.
3 citations
Cites background or methods from "Waste isolation pilot plant disposa..."
...The reader is referred to Butcher (1997) for validation of these concepts....
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...The first of these reports describes the evolution of the disposal room model to its present state of development (Butcher, 1997)....
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...The "closure" process is a complex and interdependent series of events starting after a region within a repository is excavated and filled with waste (Butcher, 1997)....
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01 Jul 1995
TL;DR: In this paper, the authors present a literature survey which quantifies the relative importance of secondary room components to room closure, a differential analysis of the creep consolidation model and definition of a follow-up Monte Carlo analysis of a model, and an analysis and refitting of the waste component data on which a volumetric plasticity model of TRU drum waste is based.
Abstract: The WIPP Disposal Room Model (DRM) is a numerical model with three major components constitutive models of TRU waste, crushed salt backfill, and intact halite -- and several secondary components, including air gap elements, slidelines, and assumptions on symmetry and geometry. A sensitivity analysis of the Disposal Room Model was initiated on two of the three major components (waste and backfill models) and on several secondary components as a group. The immediate goal of this component sensitivity analysis (Phase I) was to sort (rank) model parameters in terms of their relative importance to model response so that a Monte Carlo analysis on a reduced set of DRM parameters could be performed under Phase II. The goal of the Phase II analysis will be to develop a probabilistic definition of a disposal room porosity surface (porosity, gas volume, time) that could be used in WIPP Performance Assessment analyses. This report documents a literature survey which quantifies the relative importance of the secondary room components to room closure, a differential analysis of the creep consolidation model and definition of a follow-up Monte Carlo analysis of the model, and an analysis and refitting of the waste component data on which a volumetric plasticitymore » model of TRU drum waste is based. A summary, evaluation of progress, and recommendations for future work conclude the report.« less
1 citations
References
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01 May 1991
TL;DR: TOUGH2 as mentioned in this paper is a numerical simulation program for nonisothermal flows of multicomponent, multiphase fluids in porous and fractured media, designed for geothermal reservoir engineering, nuclear waste disposal, and unsaturated zone hydrology.
Abstract: TOUGH2 is a numerical simulation program for nonisothermal flows of multicomponent, multiphase fluids in porous and fractured media. The chief applications for which TOUGH2 is designed are in geothermal reservoir engineering, nuclear waste disposal, and unsaturated zone hydrology. A successor to the TOUGH program, TOUGH2 offers added capabilities and user features, including the flexibility to handle different fluid mixtures, facilities for processing of geometric data (computational grids), and an internal version control system to ensure referenceability of code applications. This report includes a detailed description of governing equations, program architecture, and user features. Enhancements in data inputs relative to TOUGH are described, and a number of sample problems are given to illustrate code applications. 46 refs., 29 figs., 12 tabs.
780 citations
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01 Aug 1987
TL;DR: Tough as discussed by the authors is a computer program developed at the Lawrence Berkeley Laboratory for simulating the coupled transport of water, vapor, air and heat in porous and fractured media, where the physical processes taken into account in TOUGH are discussed, and the governing equations actually solved by the simulator are stated in full detail.
Abstract: This document contains a technical description of the TOUGH computer program, which was developed at Lawrence Berkeley Laboratory for simulating the coupled transport of water, vapor, air and heat in porous and fractured media. The physical processes taken into account in TOUGH are discussed, and the governing equations actually solved by the simulator are stated in full detail. A brief overview is given of the mathematical and numerical methods, and the code architecture. The report provides detailed instructions for preparing input decks. Code applications are illustrated by means of six sample problems.
228 citations
01 Apr 1985
TL;DR: SANCHO as discussed by the authors is a finite element computer program designed to compute the quasistatic, large deformation, inelastic response of planar or axisymmetric solids.
Abstract: SANCHO is a finite element computer program designed to compute the quasistatic, large deformation, inelastic response of planar or axisymmetric solids. Finite strain constitutive theories for plasticity, volumetric plasticity, and metallic creep behavior are included. A constant bulk strain, bilinear displacement isoparametric finite element is employed for the spatial discretization. The solution strategy used to generate the sequence of equilibrium solutions is a self-adaptive dynamic relaxation scheme which is based on explicit central difference pseudo-time integration and artificial damping. A master-slave algorithm for sliding interfaces is also implemented. A theoretical development of the appropriate governing equations and a description of the numerical algorithms are presented along with a user's guide which includes several sample problems and their solution.
25 citations
01 Jan 1991
TL;DR: In this paper, the authors developed and validated a predictive technology to calculate the creep of repository rooms in the bedded salt deposits of Southeastern New Mexico, and used it to predict the time at which the repository rooms would close sufficiently to encapsulate the waste and seal the repository.
Abstract: Because of the concern for public health and safety, when compared to normal engineering practice, radioactive waste repositories have quite unusual requirements governing performance assessment. In part, performance assessment requires prediction of time-dependent or creep response of the repository hundreds to thousands of years into the future. In salt, one specific need is to predict, with confidence, the time at which the repository rooms creep closed sufficiently to encapsulate the waste and seal the repository. Thus, a major task of the Waste Isolation Pilot Plant (WIPP) Program is to develop and validate this predictive technology to calculate creep of repository rooms in the bedded salt deposits of Southeastern New Mexico. 19 refs., 15 figs., 2 tabs.
23 citations
01 Jan 1989
23 citations
"Waste isolation pilot plant disposa..." refers methods in this paper
...To improve upon early representations of the stratigraphy, a new stratigraphy description was defined coincident with development of the M-D Creep Model (Munson et al., 1989a,b)....
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...The second law, the M-D description (Munson et al., 1989a,b), has been used since then, because it more accurately represents the early part of closure....
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