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Title: Assessment of the Cast Stone Low-Temperature Waste Form Technology Coupled with Technetium Removal - 14379

The U.S. Department of Energy Office of Environmental Management (EM) is engaging the national laboratories to provide the scientific and technological rigor to support EM program and project planning, technology development and deployment, project execution, and assessment of program outcomes. As an early demonstration of this new responsibility, Pacific Northwest National Laboratory (PNNL) and Savannah River National Laboratory (SRNL) were chartered to implement a science and technology program addressing low-temperature waste forms for immobilization of DOE aqueous waste streams, including technetium removal as an implementing technology. As a first step, the laboratories examined the technical risks and uncertainties associated with the Cast Stone waste immobilization and technetium removal projects at Hanford. Science and technology gaps were identified for work associated with 1) conducting performance assessments and risk assessments of waste form and disposal system performance, and 2) technetium chemistry in tank wastes and separation of technetium from waste processing streams. Technical approaches to address the science and technology gaps were identified and an initial sequencing priority was suggested. A subset of research was initiated in 2013 to begin addressing the most significant science and technology gaps. The purpose of this paper is to report progress made towards closing these gapsmore » and provide notable highlights of results achieved to date.« less
Authors:
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Publication Date:
OSTI Identifier:
1178871
Report Number(s):
PNNL-SA-99494
EY4049110
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Waste Management Symposia (WM2014): 40 Years of meeting Global Radioactive Waste Management Challenges, March 2-6, 2014, Phoenix, Arizona, 1:722-733
Publisher:
WM Symposia, Tucson, AZ, United States(US).
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
Cast Stone Low-Temperature Waste Form Technology Coupled with Technetium Removal