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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.
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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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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Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
Michael F. Dowling, Jason D. Wartell, Sheldon M. Jeter, Said I. Abdel-Khalik
Nuclear Technology | Volume 117 | Number 3 | March 1997 | Pages 353-365
Technical Paper | Heat Transfer and Fluid Flow | doi.org/10.13182/NT97-A35349
Articles are hosted by Taylor and Francis Online.
A capacitance-type sensor whose sensitivity is sufficiently high to detect liquid water droplets in a stream of gas with very low moisture content is described. Instantaneous capacitance is measured for a probe consisting of two closely spaced parallel plates through which a two-phase mixture is flowing; the presence of liquid within the sensor’s active volume generates a measurable capacitance increase due to the much higher dielectric constant of liquid water compared with gas or steam. Proof-of-concept experiments were carried out to determine the relative effects of droplet size, velocity, and position on the output of the sensor. The probe detected individual water droplets in the range of 7.5 to 20.0 μl and had a voltage output that was linear with droplet volume in this range. In addition, the signal pulse width was found to be a sensitive indicator of droplet velocity. The data indicate that the probe can be used to measure the moisture fraction of a high-quality gas flow in the range from 0 < β <0.013 (liquid volume/total volume) with a maximum standard deviation of ∼0.001.