Gas Releases During Saltcake Dissolution for Retrieval of Single-Shell Tank Waste, Rev. 1

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It is possible to retrieve a large fraction of soluble waste from the Hanford single-shell waste tanks (SSTs) by dissolving it with water. This retrieval method will be demonstrated in Tanks U-107 and S-112 in the next few years. If saltcake dissolution proves practical and effective, many of the saltcake SSTs may be retrieved by this method. Many of the SSTs retain flammable gas that will be released into the tank headspace as the waste dissolves. This report describes the physical processes that control dissolution and gas release. Calculation results are shown and describe how the headspace hydrogen concentration evolves ... continued below

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Stewart, Charles W December 28, 2001.

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Description

It is possible to retrieve a large fraction of soluble waste from the Hanford single-shell waste tanks (SSTs) by dissolving it with water. This retrieval method will be demonstrated in Tanks U-107 and S-112 in the next few years. If saltcake dissolution proves practical and effective, many of the saltcake SSTs may be retrieved by this method. Many of the SSTs retain flammable gas that will be released into the tank headspace as the waste dissolves. This report describes the physical processes that control dissolution and gas release. Calculation results are shown and describe how the headspace hydrogen concentration evolves during dissolution. The observed spontaneous and induced gas releases from SSTs are summarized, and the dissolution of the crust layer in SY-101 is discussed as a recent example of full-scale dissolution of saltcake containing a large volume of retained gas. The report concludes that the dissolution rate is self-limiting and that gas release rates are relatively low.

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  • Other Information: PBD: 28 Dec 2001

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  • Report No.: PNNL-13597-rev-1
  • Report No.: 820201000
  • Grant Number: AC06-76RLO1830
  • DOI: 10.2172/789926 | External Link
  • Office of Scientific & Technical Information Report Number: 789926
  • Archival Resource Key: ark:/67531/metadc724671

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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.

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  • December 28, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 6, 2016, 6:18 p.m.

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Stewart, Charles W. Gas Releases During Saltcake Dissolution for Retrieval of Single-Shell Tank Waste, Rev. 1, report, December 28, 2001; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc724671/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.