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Establishment of Uncertainty Ranges and Probability Distributions of Actinide Solubilities for Performance Assessment in the Waste Isolation Pilot Plant

Published online by Cambridge University Press:  01 February 2011

Yongliang Xiong ,
Jim Nowak ,
Laurence H. Brush ,
Ahmed E. Ismail  and
Jennifer Long
Yongliang Xiong
Affiliation:
yxiong@sandia.gov, sandia national laboratories, Carlsbad, New Mexico, United States
Jim Nowak
Affiliation:
jimnowak@ixpn.com, Sandia National Laboratories, Carlsbad, New Mexico, United States
Laurence H. Brush
Affiliation:
lhbrush@sandia.gov, Sandia National Laboratories, Repository Performance Dept. 6712, 4100 National Parks Hwy., Carlsbad, New Mexico, 88220, United States, 575 234 0105, 575 234 0061
Ahmed E. Ismail
Affiliation:
aeismail@sandia.gov, Sandia National Laboratories, Carlsbad, New Mexico, United States
Jennifer Long
Affiliation:
jjlong@sandia.gov, Sandia National Laboratories, Carlsbad, New Mexico, United States
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Abstract

The Fracture-Matrix Transport (FMT) code developed at Sandia National Laboratories solves chemical equilibrium problems using the Pitzer activity coefficient model with a database containing actinide species. The code is capable of predicting actinide solubilities at 25 °C in various ionic-strength solutions from dilute groundwaters to high-ionic-strength brines. The code uses oxidation state analogies, i.e., Am(III) is used to predict solubilities of actinides in the +III oxidation state; Th(IV) is used to predict solubilities of actinides in the +IV state; Np(V) is utilized to predict solubilities of actinides in the +V state. This code has been qualified for predicting actinide solubilities for the Waste Isolation Pilot Plant (WIPP) Compliance Certification Application in 1996, and Compliance Re-Certification Applications in 2004 and 2009.

We have established revised actinide-solubility uncertainty ranges and probability distributions for Performance Assessment (PA) by comparing actinide solubilities predicted by the FMT code with solubility data in various solutions from the open literature. The literature data used in this study include solubilities in simple solutions (NaCl, NaHCO3, Na2CO3, NaClO4, KCl, K2CO3, etc.), binary mixing solutions (NaCl+NaHCO3, NaCl+Na2CO3, KCl+K2CO3, etc.), ternary mixing solutions (NaCl+Na2CO3+KCl, NaHCO3+Na2CO3+NaClO4, etc.), and multi-component synthetic brines relevant to the WIPP.

Keywords

actinidegeologicwaste management
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1265: Symposium AA – Scientific Basis for Nuclear Waste Management XXXIV , 2010 , 1265-AA01-03
Copyright
Copyright © Materials Research Society 2010

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References

1 Babb, S.C. and Novak, C.F. “User's Manual for FMT Version 2.3: A Computer Code Employing the Pitzer Activity Coefficient Formalism for Calculating Thermodynamic Equilibrium in Geochemical Systems to High Electrolyte Concentrations.” Albuquerque, NM: Sandia National Laboratories, 1997.Google Scholar
2 Giambalvo, E., Brush, L.H. and Xiong, Y. L. Eos, Y. L. Trans. AGU 83 (47), U11B–02 (2002).Google Scholar
3 Novak, C.F. J. Contaminant Hydrology 21, 297 (1996).Google Scholar
4 Wang, Y. F., “WIPP PA Validation Document for FMT (Version 2.4), Document Version 2.4.” Carlsbad, NM: Sandia National Laboratories, 1998.Google Scholar
5 Xiong, Y.L., “Release of FMT_050405.CHEMDAT.” Carlsbad, NM: Sandia National Laboratories, ERMS 539304, 2005.Google Scholar
6 Xiong, Y.L., Nowak, E.J. and Brush, L.H. Geochimica et Cosmochimica Acta 69(10), Supp.1, A417, (2005).Google Scholar
7 DOE, U.S. “Title 40 CFR Part 191 Compliance Certification Application.” DOE/CAO 1996–2184. Carlsbad, NM: U.S. DOE Carlsbad Area Office, 1996.Google Scholar
8 DOE, U.S. “Title 40 CFR Part 191 Compliance Recertification Application for the Waste Isolation Pilot Plant, Vol. 1-8.” DOE//IPP 2004–3231. Carlsbad, NM: U.S. DOE Carlsbad Field Office, 2004.Google Scholar
9 Powers, D.W. Lambert, S.J. Shaffer, S. E., Hill, L.R. Weart, W.D. Eds., “Geological Characterization Report, Waste Isolation Pilot Plant (WIPP) Site, Southeastern New Mexico, Vols. I and II.” SAND 78–1596. Albuquerque, NM: Sandia National Laboratories, 1976.Google Scholar
10 Popielak, R.S. Beauheim, R.L. Black, S.R. Coons, W.E. C.T. Ellingson and Olsen, R.L. “Brine Reservoirs in the Castile Formation, Waste Isolation Pilot Plant Project, Southeastern New Mexico.” TME 3153. Carlsbad, NM: U.S. DOE WIPP Project Office, 1983.Google Scholar
11 Xiong, Y. L. and Lord, A.S. Applied Geochemistry 23, 1634 (2008).Google Scholar