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Title: Updating Thermodynamic Model for the Waste Isolation Pilot Plant (WIPP).

Abstract

Abstract not provided.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1331666
Report Number(s):
SAND2015-2189C
579411
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the ABC-Salt IV Workshop held April 14-15, 2015 in Heidelberg, Germany.
Country of Publication:
United States
Language:
English

Citation Formats

Xiong, Yongliang, Domski, Paul Stanley, Jang, Je-Hun, Kim, Sungtae, Nemer, Martin, Kirkes, Leslie Dawn, Olivas, Taya, and Leigh, Christi D. Updating Thermodynamic Model for the Waste Isolation Pilot Plant (WIPP).. United States: N. p., 2015. Web.
Xiong, Yongliang, Domski, Paul Stanley, Jang, Je-Hun, Kim, Sungtae, Nemer, Martin, Kirkes, Leslie Dawn, Olivas, Taya, & Leigh, Christi D. Updating Thermodynamic Model for the Waste Isolation Pilot Plant (WIPP).. United States.
Xiong, Yongliang, Domski, Paul Stanley, Jang, Je-Hun, Kim, Sungtae, Nemer, Martin, Kirkes, Leslie Dawn, Olivas, Taya, and Leigh, Christi D. Sun . "Updating Thermodynamic Model for the Waste Isolation Pilot Plant (WIPP).". United States. doi:. https://www.osti.gov/servlets/purl/1331666.
@article{osti_1331666,
title = {Updating Thermodynamic Model for the Waste Isolation Pilot Plant (WIPP).},
author = {Xiong, Yongliang and Domski, Paul Stanley and Jang, Je-Hun and Kim, Sungtae and Nemer, Martin and Kirkes, Leslie Dawn and Olivas, Taya and Leigh, Christi D.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}

Conference:
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  • The conceptual model for WIPP dissolved concentrations is a description of the complex natural and artificial chemical conditions expected to influence dissolved actinide concentrations in the repository. By a set of physical and chemical assumptions regarding chemical kinetics, sorption substrates, and waste-brine interactions, the system was simplified to be amenable to mathematical description. The analysis indicated that an equilibrium thermodynamic model for describing actinide solubilities in brines would be tractable and scientifically supportable. This paper summarizes the conceptualization and modeling approach and the computational results as used in the WIPP application for certification of compliance with relevant regulations for nuclearmore » waste repositories. The WIPP site contains complex natural brines ranging from sea water to 10x more concentrated than sea water. Data bases for predicting solubility of Am(III) (as well as Pu(III) and Nd(III)), Th(IV), and Np(V) in these brines under potential repository conditions have been developed, focusing on chemical interactions with Na, K, Mg, Cl, SO{sub 4}, and CO{sub 3} ions, and the organic acid anions acetate, citrate, EDTA, and oxalate. The laboratory and modeling effort augmented the Harvie et al. parameterization of the Pitzer activity coefficient model so that it could be applied to the actinides and oxidation states important to the WIPP system.« less
  • The discrepancies between predicted and measured WIPP in situ Room D closures are markedly reduced through the use of a Tresca flow potential, an improved small strain constitutive model, an improved set of material parameters, and a modified stratigraphy. 12 refs., 5 figs., 1 tab.
  • The discrepancies between predicted and measured WIPP in situ Room D closures are markedly reduced through the use of a Tresca flow potential, an improved small strain constitutive model, an improved set of material parameters, and a modified stratigraphy. 17 refs., 8 figs., 1 tab.
  • A coupled adjoint-sensitivity/kriging approach was used to calibrate a groundwater-flow model to 10 years of human-induced transient hydraulic stresses at the WIPP site in New Mexico, USA. Transmissivity data obtained from local-scale hydraulic tests were first kriged to define an initial transmissivity distribution. Steady-state model calibration was then performed employing adjoint-sensitivity techniques to identify regions where transmissivity changes would improve the model fit to the observed steady-state heads. Subsequent transient calibration to large-scale hydraulic stresses created by shaft construction and long-term pumping tests aided in the identification of smaller scale features not detected during steady-state calibration. This transient calibration resultedmore » in a much more reliable and defendable model for use in performance-assessment calculations. 7 refs., 6 figs.« less
  • The development of the Waste Isolation Pilot Plant is supported by a research and development program which addresses various technical issues for geologic isolation of nuclear waste in bedded salt. These issues include waste interaction with the host material, structural response of the rock, repository sealing, and methods for repository design and operation. This paper discusses the status of various laboratory and field investigations in this program, and presents a summary of recent results for selected issues. In addition, an overview of all activities and the relations of each to plans for implementation of WIPP is presented. These plans includemore » full-scale experimentation with various waste forms in 1986.« less