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

DE2001786804

Publication Date	2001
Personal Author	Stewart, C. W.
Page Count	37
Abstract	It is possible to retrieve a large fraction of soluble waste from the Hanford single-shell waste tanks (SST) by dissolving it with water. This retrieval method will be demonstrated in 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 a large volume of 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 describing the headspace hydrogen concentration transient during dissolution. The observed spontaneous and induced gas releases from SSTs is 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 very large volume of retained gas. The report concludes that the dissolution rate is self limiting and gas release rates are relatively low.
Keywords	Radioactive wastes Tanks Saltcake Process control Gas releases Dissolution Physical processes Hydrogen Radioactive waste processing Hanford Reservation
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Pacific Northwest National Lab., Richland, WA.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200302
Contract Number	AC06-76RLO1830

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

Gas Releases During Saltcake Dissolution for Retrieval of Single-Shell Tank Waste.
DE2001786804

Publication Date	2001
Personal Author	Stewart, C. W.
Page Count	37
Abstract	It is possible to retrieve a large fraction of soluble waste from the Hanford single-shell waste tanks (SST) by dissolving it with water. This retrieval method will be demonstrated in 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 a large volume of 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 describing the headspace hydrogen concentration transient during dissolution. The observed spontaneous and induced gas releases from SSTs is 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 very large volume of retained gas. The report concludes that the dissolution rate is self limiting and gas release rates are relatively low.
Keywords	Radioactive wastes Tanks Saltcake Process control Gas releases Dissolution Physical processes Hydrogen Radioactive waste processing Hanford Reservation
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Pacific Northwest National Lab., Richland, WA.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200302
Contract Number	AC06-76RLO1830