Determine separations process strategy decision Page: 10 of 89
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WHC-SD-WM-ES-366
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DETERMINE SEPARATIONS PROCESS
STRATEGY: DECISION 4.2.3
1.0 INTRODUCTION
This study addresses the Tank Waste Remediation System (TWRS) 4.2.3 architecture
decision (Process Waste) as shown on Figure 1-1. Its main purpose is to provide the data
necessary to determine if separating the waste into high-level waste (HLW) and low-level
waste (LLW) fractions is warranted, but will not be used to determine how the waste is
separated or to what degree. To accomplish this goal, this study provides a summary level
comparative analysis of selected, top-level, waste treatment strategies. These strategies
include No Separations, Separations (HLW/LLW separations), and Deferred Separations of
the tank waste. These three strategies encompass the full range of viable processing
alternatives based upon full retrieval of the tank wastes as determined in the Draft
Environmental Impact Statement for the Tank Waste Remediation System ( Ecology and DOE
1995). The assumption of full retrieval of the tank wastes is a predecessor decision and will
not be revisited in this study (see Figure 1-1).
It is not the intent of this study to determine the exact processing scheme (i.e., extent
of separations) that should be used, but instead to determine which processing strategies
warrant further study. The definition of the processes within the selected processing scheme
will be examined in future documents.
1.1 BACKGROUND
This section provides a discussion of background information necessary to understand
the rationale for the current baseline treatment strategy. In addition, this section discusses
the issues that drive the need for and scope of this study.
1.1.1 Current Treatment Strategy
The current baseline treatment strategy is outlined in several documents (Ecology et
al. 1994, WHC 1994, and WHC 1995a) and consists of processes that separate the retrieved
tank wastes into high and low level fractions. The baseline also calls for the separations
processes to be coupled with immobilization processes to ultimately dispose of all retrieved
tank wastes.
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Slaathaug, E.J. Determine separations process strategy decision, report, January 1, 1996; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc674645/m1/10/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.