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Division Spotlight
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
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.
V. Subramanian, R. Baskaran, J. Misra, R. Indira
Nuclear Technology | Volume 176 | Number 1 | October 2011 | Pages 83-92
Reactor Safety | doi.org/10.13182/NT11-A12544
Articles are hosted by Taylor and Francis Online.
In core disruptive accident conditions of sodium-cooled fast reactors, the reactor containment building (RCB) is filled with a large amount of sodium aerosols, along with fuel and fission product aerosols. The environmental source term depends on the quantity of aerosols released from RCB, which in turn depends on the quantity of aerosols that remains suspended in the RCB volume. The sodium aerosols are generated by the combustion process, resulting in micrometer-sized aerosols, while fuel and fission product aerosols are generated by vaporization condensation, resulting in nanometer-sized aerosols. To ascertain the behavior of mixed aerosols generated by the different processes, experiments are conducted by generating sodium aerosols and nonradioactive fission product aerosols and then studying their behavior in a closed vessel. The study includes (a) the initial size distribution of CeO2 and SrO2 aerosols, (b) the behavior of suspended mass concentration as a function of time, and (c) the behavior of suspended number concentration as a function of time. The initial size of the sodium combustion aerosols is [approximately]1.0 m, whereas the initial size of the fuel and fission product aerosols is nanometer sized ([approximately]30 nm). In the context of the behavior of the two different-sized aerosols, sodium aerosol behavior dominates the overall suspended mass concentration of the system. The rate of change of number concentration exhibits two regions. The timescale involved for the Brownian coagulation region is found to be [approximately]80 min for nonradioactive fission product aerosols, whereas it lasts only 20 to 30 min when the aerosol system is mixed with sodium aerosols.
