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Division Spotlight
Education, Training & Workforce Development
The Education, Training & Workforce Development Division provides communication among the academic, industrial, and governmental communities through the exchange of views and information on matters related to education, training and workforce development in nuclear and radiological science, engineering, and technology. Industry leaders, education and training professionals, and interested students work together through Society-sponsored meetings and publications, to enrich their professional development, to educate the general public, and to advance nuclear and radiological science and engineering.
Meeting Spotlight
2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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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Nuclear Science and Engineering
November 2024
Nuclear Technology
Fusion Science and Technology
Latest News
A proactive approach to reactor vessel aging management
Unit 2 at the Prairie Island nuclear power plant near Red Wing, Minn., underwent an outage in fall 2023, which included extensive work on the reactor vessel using a novel approach to replace baffle-former bolts and lower radial clevis insert bolts. The work relied on extensive analysis beforehand to determine which bolts to replace such that only the new bolts were structurally credited for performance of their safety function. This proactive approach eliminated the need for costly contingencies associated with inspections.
Fumito Okino, Yukinori Hamaji, Teruya Tanaka, Juro Yagi
Fusion Science and Technology | Volume 80 | Number 8 | November 2024 | Pages 1060-1069
Research Article | doi.org/10.1080/15361055.2024.2312055
Articles are hosted by Taylor and Francis Online.
The axial concentration of deuterium by dispersion in a circulating liquid lithium-lead (LiPb) loop was analyzed and experimentally verified. In previous fusion blanket studies, the tritium transport rate in flowing LiPb was treated by convection a priori; i.e., the dispersion effect was negligible. In contrast, Taylor dispersion theory shows conflicting results, exhibiting axial transport enhancement via convective flow. In the current paper, the experimental setup consists of a deuterium dissolving tube that substitutes for tritium breeding and a deuterium concentration monitor by LiPb droplets in a vacuum with four nozzles of ϕ = 1.0 mm. The released deuterium mass flux from the droplets was measured using a quadrupole mass spectrometer. An electromagnetic pump circulated 49 L of LiPb at 350°C at a rate between 0.15 and 0.3 L∙min–1 with the corresponding Re number between 600 and 1000, i.e., in the laminar flow range. The dispersion coefficient was analyzed by measuring the temporal distortion of the deuterium concentration profile. The obtained axial dispersion coefficients of dissolved deuterium in LiPb were between 4.6 × 10–2 and 1.2 × 10–1 (m2∙s–1) and approximately seven orders of magnitude greater than those under static conditions. The results agreed with the Taylor dispersion theory, which studied the mass transport enhancement by convection. The applicability of Taylor’s theory to the deuterium flow in liquid LiPb is suggested, whereas the Prandtl number was three orders of magnitude lower and the Schmidt number was one order of magnitude higher than that of the water.