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2024 ANS Annual Conference
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Glass strategy: Hanford’s enhanced waste glass program
The mission of the Department of Energy’s Office of River Protection (ORP) is to complete the safe cleanup of waste resulting from decades of nuclear weapons development. One of the most technologically challenging responsibilities is the safe disposition of approximately 56 million gallons of radioactive waste historically stored in 177 tanks at the Hanford Site in Washington state.
ORP has a clear incentive to reduce the overall mission duration and cost. One pathway is to develop and deploy innovative technical solutions that can advance baseline flow sheets toward higher efficiency operations while reducing identified risks without compromising safety. Vitrification is the baseline process that will convert both high-level and low-level radioactive waste at Hanford into a stable glass waste form for long-term storage and disposal.
Although vitrification is a mature technology, there are key areas where technology can further reduce operational risks, advance baseline processes to maximize waste throughput, and provide the underpinning to enhance operational flexibility; all steps in reducing mission duration and cost.
Anthony L. Crawford (INL), David Estrada, Kiyo Fujimoto (Boise State Univ)
Proceedings | Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technolgies (NPIC&HMIT 2019) | Orlando, FL, February 9-14, 2019 | Pages 1530-1537
This paper presents a test platform capable of applying representative in-pile thermal and monotonic, cyclic, and dynamic force loadings which induce target strain into representative in-pile components. The system’s form is that of two concentric linear delta robots and an intermediate vertical furnace. The enabled relative motion between the end effector platforms will result in enhanced performance compared to single delta or nearly any other Cartesian translational system by doubling the speed, quadrupling the workspace, and being able to actively prevent vibrational damage to its mechanical components. The employed force/torque sensors and motors are sized to apply/measure the target ranges, sensitivities, and bandwidths representative of in-pile loadings for objects of interest. The system has been designed to accommodate many in-pile geometries including a conventional (15mm OD x 12mm ID) fuel pin. Collet chucks attached to the force/torque sensors are designed to secure the pin ends as it transgresses through a furnace tube cavity allowing it to be thermally and/or force loaded. Such a configuration allows material characterization and sensor qualification/development to be performed. The system’s current configuration will have the ability to execute a comprehensive thermal and force loaded strain gauge study. Considered strain gauges in this future study will include conventional resistive strain gauges, weldable resistive strain gauges, and printed capacitive based strain gauges. The printed capacitive strain gauges being developed by this effort are of highest interest due to preliminary results indicating that their performance measures are more compatible with in-pile environments than their commercial counterparts. The test platform will be a critical element in validating the performance of the employed nuclear grade inks for aerosol jet printing, the printing and physical characterization of the printed structures, and the evaluation of sensor performance pre and post-irradiation.