Thermocouple psychrometer measurements of in situ water potential changes in heated welded tuff

PDF Version Also Available for Download.

Description

Ten thermocouple psychrometers (TCPs) to measure water potential (WP) were installed in three holes in G-Tunnel at the Nevada Test Site as part of the Prototype Engineered Barrier System Field Tests. We calibrated the TCPs in NaCl solutions up to 80{degrees}C (176{degrees}F) in the laboratory. In two holes, we used rubber sleeves and packers to house TCPs, and in the third hole, we used foam. All three holes were grouted behind the TCP assemblages. The initial moisture condition indicated by TCP data was about 99.5% relative humidity or a WP of about {minus}5 bar. This corresponded to 15.4 g/m{sup 3} ... continued below

Physical Description

21 p.

Creation Information

Mao, Nai-hsien & Wang, H.F. October 1, 1991.

Context

This article 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 article can be viewed below.

Who

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

Authors

  • Mao, Nai-hsien Lawrence Livermore National Lab., CA (United States)
  • Wang, H.F. Wisconsin Univ., Madison, WI (United States). Dept. of Geology and Geophysics

Sponsor

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 article. Follow the links below to find similar items on the Digital Library.

Description

Ten thermocouple psychrometers (TCPs) to measure water potential (WP) were installed in three holes in G-Tunnel at the Nevada Test Site as part of the Prototype Engineered Barrier System Field Tests. We calibrated the TCPs in NaCl solutions up to 80{degrees}C (176{degrees}F) in the laboratory. In two holes, we used rubber sleeves and packers to house TCPs, and in the third hole, we used foam. All three holes were grouted behind the TCP assemblages. The initial moisture condition indicated by TCP data was about 99.5% relative humidity or a WP of about {minus}5 bar. This corresponded to 15.4 g/m{sup 3} of water in the air near the borehole wall, which was much wetter than we expected. A drying and re-wetting cycle peaked at about day 140 with a WP of {minus}65 bar in borehole P3, located below the heater. A similar cycle but reduced in scale was found at about day 175 with a WP of {minus}45 bar in borehole P2, above the heater. This difference is drying behavior above and below the heater was also observed from neutron data and was explained as a gravity effect.

Physical Description

21 p.

Notes

INIS; OSTI as DE92014884

Source

  • Focus `91: nuclear waste packaging, Las Vegas, NV (United States), 29 Sep - 4 Oct 1991

Language

Item Type

Identifier

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

  • Other: DE92014884
  • Report No.: UCRL-JC--106752
  • Report No.: CONF-910945--11
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 138439
  • Archival Resource Key: ark:/67531/metadc625539

Collections

This article 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 article?

When

Dates and time periods associated with this article.

Creation Date

  • October 1, 1991

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

Description Last Updated

  • Feb. 17, 2016, 7:20 p.m.

Usage Statistics

When was this article last used?

Yesterday: 0
Past 30 days: 2
Total Uses: 7

Interact With This Article

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

Mao, Nai-hsien & Wang, H.F. Thermocouple psychrometer measurements of in situ water potential changes in heated welded tuff, article, October 1, 1991; California. (digital.library.unt.edu/ark:/67531/metadc625539/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.