Hydrogen retention and release from uranium dioxide

PDF Version Also Available for Download.

Description

The ceramic samples (UO/sub 2/) are exposed to high pressure hydrogen gas at a fixed temperature for a time sufficient to achieve equilibrium. After rapid quenching, the hydrogen-saturated sample is transferred to a vacuum-outgassing furnace. The sample is outgassed in a linear temperature ramp and the released hydrogen is detected by an in-situ mass spectrometer. This technique measures the rate of release of hydrogen with a sensitivity level of about 2 ng of hydrogen (as D/sub 2/) per hour. In this study, experiments were conducted on both polycrystalline and single-crystal UO/sub 2/. Experimental variables included temperature (1000 to 1600/sup 0/C) ... continued below

Physical Description

Pages: 158

Creation Information

Sherman, D.F. August 1, 1987.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Author

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

The ceramic samples (UO/sub 2/) are exposed to high pressure hydrogen gas at a fixed temperature for a time sufficient to achieve equilibrium. After rapid quenching, the hydrogen-saturated sample is transferred to a vacuum-outgassing furnace. The sample is outgassed in a linear temperature ramp and the released hydrogen is detected by an in-situ mass spectrometer. This technique measures the rate of release of hydrogen with a sensitivity level of about 2 ng of hydrogen (as D/sub 2/) per hour. In this study, experiments were conducted on both polycrystalline and single-crystal UO/sub 2/. Experimental variables included temperature (1000 to 1600/sup 0/C) and infusion pressure (5 to 32 atm D/sub 2/), and for the polycrystalline specimen, stoichiometry. Dissolution of H/sub 2/ in both single-crystal and polycrystalline UO/sub 2/ was found to obey Seivert's law. The Sievert's law constant of deuterium in single-crystal UO/sub 2/ was determined to be: 3.0 x 10/sup 7/exp(-235 kJ/RT) ppM atomic/..sqrt..atm and for polycrystalline UO/sub 2/: 5.5 x 10/sup 4/exp(-100 kJ/RT) ppM atomic/..sqrt..atm. The solubility of hydrogen in hypostoichiometric urania was found to be up to three orders of magnitude greater than in stoichiometric UO/sub 2/ depending on the O/U ratios, implying the anion vacancy is the primary solution site in the UO/sub 2/ lattice. The release-rate curves for the single crystal and polycrystalline UO/sub 2/ specimens exhibited multiple peaks, with most of the deuterium released between 600 and 1200/sup 0/C for the polycrystalline samples, and between 700 and 1800/sup 0/C in the single-crystal specimens. This release of hydrogen from UO/sub 2/ could not be adequately modeled as diffusion or diffusion with trapping and resolution. It was determined that release was governed by release from traps in both the polycrystalline and single crystal UO/sub 2/ specimens. 40 refs., 72 figs., 6 tabs.

Physical Description

Pages: 158

Notes

NTIS, PC A08/MF A01; 1.

Source

  • Other Information: Thesis (Ph.D.). Portions of this document are illegible in microfiche products

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Other: DE88002042
  • Report No.: LBL-24030
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/5816618 | External Link
  • Office of Scientific & Technical Information Report Number: 5816618
  • Archival Resource Key: ark:/67531/metadc1100373

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

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

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • August 1, 1987

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

Description Last Updated

  • April 27, 2018, 4:34 p.m.

Usage Statistics

When was this report last used?

Congratulations! It looks like you are the first person to view this item online.

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Sherman, D.F. Hydrogen retention and release from uranium dioxide, report, August 1, 1987; [Livermore,] California. (digital.library.unt.edu/ark:/67531/metadc1100373/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.