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• W2184036396 abstract "Several U.S. Department of Energy (DOE) sites have a need to measure the physical, chemical and radiological properties of high-level waste (HLW) in order to prevent plugging of transfer lines, provide verification of process flow sheet analyses of waste moved between tanks, and to assure that tanks are not filled beyond safe limits for gas generation concerns. Remote monitor technologies and/or instruments can help improve operational efficiencies and provide accurate information on the waste characteristics [1]. As part of Florida International University’s (FIU’s) research efforts, the development of technologies to improve monitoring of HLW characteristics has been an on-going effort for several years. FIU has completed the design of several HLW monitors for deployment within the HLW tanks. The monitors have been developed to provide real-time information on (1) surface contour of settled solids, and (2) waste solids weight percent during mixing. FIU has worked with Hanford and SRS site engineers in the development of these systems that provide significant improvements over baseline technologies. This paper will discuss the development of these two systems and some of the verification testing results. In addition, the benefits of these technologies versus the baseline methods will be addressed by presenting research results at FIU and national laboratories. BACKGROUND The U.S. DOE Hanford site has the largest number of High-Level Waste (HLW) storage tanks and the largest volume of HLW in the United States. The safe storage, retrieval, treatment, and disposal of approximately 53 million gallons of highly toxic, high-level radioactive waste stored in Hanford’s 177 underground tanks are a national priority. Retrieval and treatment of waste from these tanks pose a considerable challenge. Specifically, FIU has focused on two issues that could benefit from improvements in the measurement methods. The retrieval of highly concentrated slurry (>20% solids by weight) and the over-filling (or under-filling) of HLW double-shell tanks (DST) during waste staging operations are activities that require costly conservative actions or limits to be set due to time delay and lack of resolution in the available monitoring data. During retrieval of waste over the years, there have been several transfer pipelines that have been plugged. Costs exceeding $3M dollars have been expended to bypass plugged pipeline sections. The continuous and in-situ monitoring of the slurry solids weight-percent in the tank or pipeline can ensure slurry homogeneity in a transfer or retrieval scenario. This data can help engineers ensure that slurries are maintained above their critical velocities. The monitoring can mitigate the potential for pipeline plugging by providing operators with real-time measurements of weight-percent solids, allowing them to adjust mixing/transfer parameters as needed [2]. Presently, all solids weight percent estimates at the Hanford site are performed via laboratory analysis of samples taken from a tank, or via an in-line, ultrasonic-based system for weight percent measurement in real time. Laboratory analyses are costly, time-consuming and not representative of dynamic solids concentrations. The ultrasonic technology lacks the accuracy achievable with laboratory or hot cell analyses. Ultrasonic measurements are better suited to track changes to solids concentration (trending) than to provide analytical results [3]. Based on the technological and logistic limitations, Hanford site personnel have identified the need for a real-time, insitu monitor for solids concentrations in slurries. The inability to monitor the actual solid-liquid interface in tanks leads to conservative estimates on when a tank has reached its safe maximum solids level. Due to the very limited space available in the HLW" @default.
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• W2184036396 date "2010-01-01" @default.
• W2184036396 modified "2023-09-27" @default.
• W2184036396 title "Remote Monitors for High Level Waste (HLW) - 10098" @default.
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