Modeling of Diffusion of Plutonium in Other Metals and of Gaseous Species in Plutonium-Based Systems

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The problem being addressed is to establish standards for temperature conditions under which plutonium, uranium, or neptunium from nuclear wastes permeates steel, with which it is in contact, by diffusion processes. The primary focus is on plutonium because of the greater difficulties created by the peculiarities of face-centered-cubic-stabilized (delta) plutonium (the form used in the technology generating the waste). Temperature is the key controllable diffusion processes, i.e., temperature controls the rate of diffusion. The scientific goal of this project is to predict diffusion constants on an ab initio basis, i.e. diffusion distances in specified time at specified temperature for plutonium ... continued below

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Cooper, Bernard R. & Fernando, Gayanath June 1, 1999.

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Description

The problem being addressed is to establish standards for temperature conditions under which plutonium, uranium, or neptunium from nuclear wastes permeates steel, with which it is in contact, by diffusion processes. The primary focus is on plutonium because of the greater difficulties created by the peculiarities of face-centered-cubic-stabilized (delta) plutonium (the form used in the technology generating the waste). Temperature is the key controllable diffusion processes, i.e., temperature controls the rate of diffusion. The scientific goal of this project is to predict diffusion constants on an ab initio basis, i.e. diffusion distances in specified time at specified temperature for plutonium from plutonium-based waste materials into various steels or technologically-pertinent metallic alloys. This predictive ability will help to provide information relevant to setting temperature standards for maintaining structures, ducts, equipment or waste-containing vessels until such time as decontamination and decommissioning and/or permanent storage can be carried out. In addition, this knowledge will aid in assessing the depth of penetration that must be dealt with in any surface treatment for decontamination. The scientific steps of the methodology are (1) to recognize the stabilizing mechanism and the electronic structure pertinent to that stabilization for face-centered-cubic (fcc) delta-stabilized plutonium, (2) to extract the information needed to perform dynamic simulations from ab initio electronic structure calculations, (3) to perform and report the dynamic simulations predicting the diffusion behavior.

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  • Other Information: PBD: 1 Jun 1999

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  • Report No.: EMSP-59925--1999
  • Grant Number: FG07-97ER45671
  • DOI: 10.2172/828399 | External Link
  • Office of Scientific & Technical Information Report Number: 828399
  • Archival Resource Key: ark:/67531/metadc779060

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 1, 1999

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 21, 2016, 2:30 p.m.

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Cooper, Bernard R. & Fernando, Gayanath. Modeling of Diffusion of Plutonium in Other Metals and of Gaseous Species in Plutonium-Based Systems, report, June 1, 1999; United States. (digital.library.unt.edu/ark:/67531/metadc779060/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.