ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
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.
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!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
April 2025
Fusion Science and Technology
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.
F. Maekawa, Y. Oyama
Nuclear Science and Engineering | Volume 125 | Number 2 | February 1997 | Pages 205-217
Technical Paper | doi.org/10.13182/NSE97-A24267
Articles are hosted by Taylor and Francis Online.
Neutron spectra below 10 keV in an iron shield assembly bombarded by deuterium-tritium neutrons are measured with accuracy between 5 to 13% by adopting the slowing-down time method. The measurement supplemented previous spectrum measurements for higher energies so that the neutron spectrum in the whole energy range from 14 MeV down to 0.3 eV is now available. Benchmark tests of iron data in JENDL-3.1, JENDL-3.2, JENDL fusion file, and FENDL/E-1.0 were carried out in the whole energy range with experimental uncertainty at ∼10% by utilizing the present and previous experiments. As a result, it was found that cross-section data in the newer versions of JENDL were improved in terms of agreement with the experiment. Calculation with JENDL fusion file and FENDL/E-1.0 could predict neutron fluxes in the whole energy range within 20 and 15%, respectively. Possible over- and underestimations for nonelastic and elastic cross sections, respectively, at 14 MeV in all JENDLs were pointed out. It was confirmed that low-energy neutron fluxes were very sensitive to Q values for discrete inelastic cross sections of natural iron and 57Fe(n,n’1,) reaction, which were not adequately treated in JENDL-3.1.
