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Materials Science & Technology
The objectives of MSTD are: promote the advancement of materials science in Nuclear Science Technology; support the multidisciplines which constitute it; encourage research by providing a forum for the presentation, exchange, and documentation of relevant information; promote the interaction and communication among its members; and recognize and reward its members for significant contributions to the field of materials science in nuclear technology.
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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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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.
L. J. Esch, M. L. Yeater, W. E. Moore, K. W. Seemann
Nuclear Science and Engineering | Volume 46 | Number 2 | November 1971 | Pages 223-235
Technical Paper | doi.org/10.13182/NSE71-A22356
Articles are hosted by Taylor and Francis Online.
The double differential neutron scattering cross section for water has been measured at temperatures of 27, 170, and 270°C, The RPI linear electron accelerator provided the pulsed neutron source for a time-of-flight analysis of neutron energy. By phasing the LINAC with a high speed chopper, incident neutron energies ranging from 0.04 to 0.632 eV were selected. Energy distributions of scattered neutrons were obtained at scattering angles of 10, 14, 25, 40, 60, 90, 120, and 150 deg. The relatively wide range of incident energies with good resolution made it possible to observe clearly the molecular energy levels. The structure was seen to broaden considerably in going from 27 to 170°C but was little changed by the further temperature increase. A model has been developed in which the water scattering system is considered as consisting of aggregates of molecules. These clusters have temperature-dependent sizes, and diffuse according to a temperature-dependent diffusion constant. The energy levels of the molecules bound in the cluster are represented by a multi-Gaussian frequency distribution which varies with temperature. The internal vibrations of the individual water molecules are represented by delta functions. A new approach has been taken in comparing this and other models with the data, involving the application of recent improvements in methods of treating resolution and multiple scattering: a Monte Carlo technique has been used to impose these conditions on the models. These comparisons, and comparisons with integral data, indicate that the new model should have advantages for reactor calculations.