ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
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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.
Amir N. Nahavandi and George J. Bohm
Nuclear Science and Engineering | Volume 26 | Number 1 | September 1966 | Pages 80-89
Technical Paper | doi.org/10.13182/NSE66-A17190
Articles are hosted by Taylor and Francis Online.
The dynamic response of reactor structural components is obtained by direct numerical solution of the differential equations for a linear or a nonlinear situation considering the components to be a continuous network. The equation of motion of each element is expressed in spatial finite-difference form and integrated to determine deflections as a function of time. The deflection curves and excitation frequencies in a vertical beam, sinusoidally excited at the top and striking an elastic spring at the bottom, are determined satisfactorily as an example of the method. The pattern in this nonlinear system is shown to be similar to the modal behavior of linear structures. The single-valuedness and the lack of discontinuous jumps in the response curve characterize the dynamic stability of the system. The time variation of the beam-end displacements demonstrate the existence of nonuniform distributions of sub- and super-harmonics in the response frequency spectrum. A numerical stability analysis is performed for the problem under study and a criterion for the convergence of the numerical solution is developed. This criterion proved to be satisfactory for the analysis.