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Division Spotlight
Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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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NRC engineers share their expertise at the University of Puerto Rico
Robert Roche-Rivera and Marcos Rolón-Acevedo are licensed professional engineers who work at the U.S. Nuclear Regulatory Commission. They are also alumni of the University of Puerto Rico–Mayagüez (UPRM) and have been sharing their knowledge and experience with students at their alma mater since last year, serving as adjunct professors in the university’s Department of Mechanical Engineering. During the 2023–2024 school year, they each taught two courses: Fundamentals of Nuclear Science and Engineering, and Nuclear Power Plant Engineering.
Longkun He, Pengfei Liu, Bo Kuang
Nuclear Science and Engineering | Volume 195 | Number 4 | April 2021 | Pages 367-390
Technical Paper | doi.org/10.1080/00295639.2020.1822124
Articles are hosted by Taylor and Francis Online.
Jet fragmentation greatly influences the possibility of steam explosion and the formation of a debris bed when a molten corium jet falls into subcooled coolant during a severe accident of a nuclear reactor—which is called fuel and coolant interaction (FCI). The characteristics of different jet fragmentation mechanisms and the conditions under which they play a major role are still in doubt. Experiments were carried out to investigate the fragmentation characteristics of melt jet interaction with water at medium temperature (~680°C) and high temperature (1800°C to 2150°C). Molten metal [tin or Type 304 stainless steel (304SS)], oxide (alumina), and their mixture (304SS-alumina) were used as melt materials to obtain different fragmentation mechanisms. In addition, the effects of melt temperature, water subcooling, and water depth on jet fragmentation were also studied. Through comprehensive analysis of high-speed photography, dynamic pressure, water temperature variation, and jet breakup length during interactions as well as the morphology and size of debris after interactions, it was found that the characteristics of jet fragmentation varied greatly at different melt temperatures and water subcooling due to competition between hydrodynamic fragmentation and thermodynamic fragmentation caused by boiling. In addition, under high-temperature conditions, fragmentation of alumina was much greater than 304SS due to the fracture of solidifying melt caused by thermal stress. Finally, five kinds of mechanisms of melt jet fragmentation under different conditions are summarized.