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Division Spotlight
Accelerator Applications
The division was organized to promote the advancement of knowledge of the use of particle accelerator technologies for nuclear and other applications. It focuses on production of neutrons and other particles, utilization of these particles for scientific or industrial purposes, such as the production or destruction of radionuclides significant to energy, medicine, defense or other endeavors, as well as imaging and diagnostics.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Jul 2024
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Nuclear Science and Engineering
August 2024
Nuclear Technology
Fusion Science and Technology
Latest News
ARPA-E announces $40 million to develop transmutation technologies for UNF
The Department of Energy’s Advanced Research Projects Agency–Energy (ARPA-E) announced $40 million in funding to develop cutting-edge technologies to enable the transmutation of used nuclear fuel into less-radioactive substances. According to ARPA-E, the new initiative addresses one of the agency’s core goals as outlined by Congress: to provide transformative solutions to improve the management, cleanup, and disposal of radioactive waste and spent nuclear fuel.
Weidong Ding, Hongguang Yang, Qin Zhan
Fusion Science and Technology | Volume 80 | Number 2 | February 2024 | Pages 205-214
Research Article | doi.org/10.1080/15361055.2023.2216533
Articles are hosted by Taylor and Francis Online.
The ZrCo-based alloy is considered one of the most promising materials for hydrogen isotope storage in the conceptual design of a fusion reactor. However, there are few systematic studies on the thermodynamic and kinetic models of hydrogen absorption in the new Zr0.8Ti0.2Co alloy. The aim of this study is to computationally derive the general mathematical equations for the thermodynamics and kinetics of hydrogen absorption by Zr0.8Ti0.2Co. In order to obtain the thermodynamic and kinetic data quickly, a constant-flow hydrogen absorption test was used in this study. The thermodynamic performance test revealed that the Zr0.8Ti0.2Co hydrogen absorption transition process was switched from ZrCo to ZrCoHx (metastable phase) and then to ZrCoH3 with an enthalpy of hydrogenation (ΔH) of 66.59 kJ·mol−1 H2, which was obviously lower than that of the ZrCo-based alloy due to the metastable phase.
A mathematical model of the hydrogen absorption coupled with the kinetic equations was established by kinetic process analysis. The hydrogen absorption process was divided into two stages, and the Johnson-Mehl-Avrami-Kolmogorov (JMAK) model could fit the two stages of the Zr0.8Ti0.2Co hydrogen absorption well. In the first stage, the JMAK index was n1 = 1.04, activation energy Ea1 = 7594.6 J/mol, and rate coefficient of reaction k01 = 1.958E-4 s−1. While in the second stage, it was n2 = 1.39, Ea2 = 5221 J/mol, and k02 = 9.938E-5 s−1. Based on the range of n values, it can be inferred that both the nucleation and growth mechanisms or the diffusion mechanism were expressed as the rate-limiting steps. Combined with the simulation software, metal hydride bed performance could be better investigated and the structural design could be guided by the obtained mathematical equation of Zr0.8Ti0.2Co hydriding.