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Fusion Energy
This division promotes the development and timely introduction of fusion energy as a sustainable energy source with favorable economic, environmental, and safety attributes. The division cooperates with other organizations on common issues of multidisciplinary fusion science and technology, conducts professional meetings, and disseminates technical information in support of these goals. Members focus on the assessment and resolution of critical developmental issues for practical fusion energy applications.
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2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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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.
Kirk L. Shanahan
Fusion Science and Technology | Volume 71 | Number 4 | May 2017 | Pages 555-564
Technical Note | doi.org/10.1080/15361055.2017.1291042
Articles are hosted by Taylor and Francis Online.
Tritium decays to 3He, and when this decay occurs inside a metal tritide, the 3He is largely retained in the material’s bulk. This impacts the subsequent behavior of the hydrogen isotope absorption and desorption, altering the materials thermodynamic characteristics. Chemical substitution can form alternative miscible hydridable metal alloys over some concentration ranges with modified thermodynamic properties. This allows the ‘tuning’ of metal hydride characteristics to expand the inventory of available materials for use, potentially allowing a closer match to desired performance characteristics. It is important to quantify tritium aging effects in order to predict the long term, in-process behavior of metal hydride materials. The Savannah River National Laboratory has been interested in elucidating the impact of tritium exposure on the behavior of hydrideable metals and metal alloys. Pd alloy foils of nominal 5 and 9 at% Cr, Ni, and Co, were loaded with tritium, and stored for ~1 year in static storage. One sample (Pd-4.8 at% Ni) was subsequently stored for an additional ~3 years. Isotherms were determined following storage periods to study the tritium induced changes caused by tritium decay. Typical effects such as plateau pressure depression and heel formation were noted. The materials proved to be unusually sensitive to the isotherm determination process and decay effects were partially reversed, or “healed”. The Pd-4.8wt%Ni sample was removed from its storage unit, whereupon it was found to have turned into powder, and further studied with additional techniques elsewhere.