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Division Spotlight
Young Members Group
The Young Members Group works to encourage and enable all young professional members to be actively involved in the efforts and endeavors of the Society at all levels (Professional Divisions, ANS Governance, Local Sections, etc.) as they transition from the role of a student to the role of a professional. It sponsors non-technical workshops and meetings that provide professional development and networking opportunities for young professionals, collaborates with other Divisions and Groups in developing technical and non-technical content for topical and national meetings, encourages its members to participate in the activities of the Groups and Divisions that are closely related to their professional interests as well as in their local sections, introduces young members to the rules and governance structure of the Society, and nominates young professionals for awards and leadership opportunities available to members.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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Latest News
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.
Wan Yong Chon, Evan C. Kovacic, Frederick G. Hammitt
Nuclear Science and Engineering | Volume 13 | Number 2 | June 1962 | Pages 65-74
Technical Paper | doi.org/10.13182/NSE62-A26135
Articles are hosted by Taylor and Francis Online.
Cocurrent downward flow of a settled bed of particles in a liquid medium through a straight tube with a restricting orifice at the lower end was studied in connection with a “paste” type mobile fuel system developed by Atomic Power Development Associates, Inc. for a fast breeder reactor. It was found that the excess liquid flow rate around the particles, and other related physical quantities, can be satisfactorily evaluated through already existing moving bed correlations. However, in order to determine the absolute, rather than excess or relative, flow rates of both liquid and particles, a new understanding and correlation are needed by which the flow through the restricting orifice of the system can be coupled with the flow in the straight tube section above the orifice. New correlations, using two dimensionless quantities, i.e., and effluent paste density expressed as the ratio of particle flow rate to total flow rate, and an “in-orifice” modified Reynolds' number, were developed for both wetted orifice (i.e., paste discharging through an orifice into a liquid phase) and nonwetted orifices (paste discharging through an orifice into a gaseous phase). Square edge orifices were employed as well as tapered edge orifices. The ranges of the principal variables covered experimentally are as follows: particle size: 60 to 325 mesh (1.7 mils to 9.8 mils); particle density: 2.6 gm/cc to 18.9 gm/cc; liquid viscosity: 0.004 to 0.2 cm2/sec; particle flow rate: 5 to 40 cc/min; orifice diameter: 0.075 in. to 0.199 in.
