Best Basis Inventory Template Compositions of Common Tank Waste Layers
The chemical processing of irradiated reactor fuel generated large amounts of waste that required storage and disposal. Most of this waste now exists as either a metal oxy-hydroxide sludge or as a saltcake consisting primarily of nitrate, nitrite, phosphate, carbonate, and sulfate salts of sodium. The waste is stored in 177 underground tanks. For various reasons, waste streams from the processing facilities were segregated within the tanks. This practice resulted in the layering or sludges and saltcake. Each process generated unique layer compositions. Knowledge of the composition of these layers and their location from tank farm records can be used to estimate tank waste inventories for tanks where sampling data is not available. The purpose of this study is to develop waste type templates for use in estimating tank waste inventories for tanks that have not been sampled, or when sample data for a tank is incomplete. Waste type templates are also used as a reference in confirming or rejecting the process history of a waste tank by comparing the tank sample data to waste type template compositions. The Best-Basis Inventory (BBI) uses both solid waste type templates and liquid waste type templates to establish the contents of tanks which have not been sampled or tanks for which sampling is incomplete. The waste type templates were created from sample data, process knowledge, and Hanford Defined Waste (HDW) model estimates. The original waste type template compositions were developed in 1996 and were limited to analytes for which sample data existed (primarily the waste chemicals). These templates only addressed solid wastes (sludges and saltcakes). During subsequent annual updates of the BBI, these compositions were found to be deficient for a variety of reasons. This report documents the derivation of updated waste type templates from tank sample data and HDW model data. Both solid waste type templates and liquid waste type templates have been developed. Solid waste type templates are based on sample data supplemented with HDW model data. The solid waste type templates are considered to be indicative of waste layers drained of free flowing liquid. Liquid waste type templates are primarily based on HDW model predictions because adequate liquid sample data were not available. This report documents how the waste type templates were developed from sample and HDW model data. Discussion of the sample data used in constructing the solid waste type templates constitutes the majority of this report.
- Research Organization:
- CH2M Hill Hanford Group, Inc., Richland, WA (United States)
- Sponsoring Organization:
- USDOE Office of Environmental Management (EM) (US)
- DOE Contract Number:
- AC27-99RL14047
- OSTI ID:
- 807590
- Report Number(s):
- RPP-8847, Rev.0; EDT-633256; TRN: US0301914
- Resource Relation:
- Other Information: PBD: 4 Dec 2001
- Country of Publication:
- United States
- Language:
- English
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