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Division Spotlight
Mathematics & Computation
Division members promote the advancement of mathematical and computational methods for solving problems arising in all disciplines encompassed by the Society. They place particular emphasis on numerical techniques for efficient computer applications to aid in the dissemination, integration, and proper use of computer codes, including preparation of computational benchmark and development of standards for computing practices, and to encourage the development on new computer codes and broaden their use.
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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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
NRC cuts fees by 50 percent for advanced reactor applicants
The Nuclear Regulatory Commission has announced it has amended regulations for the licensing, inspection, special projects, and annual fees it will charge applicants and licensees for fiscal year 2025.
Cheol Ho Pyeon, Takahiro Yagi, Kiichi Sukawa, Yoshimasa Yamaguchi, Tsuyoshi Misawa
Nuclear Science and Engineering | Volume 177 | Number 2 | June 2014 | Pages 156-168
Technical Paper | doi.org/10.13182/NSE13-21
Articles are hosted by Taylor and Francis Online.
Experimental studies on the thorium-loaded accelerator-driven system (ADS) were conducted at the Kyoto University Critical Assembly. Mockup experiments were carried out in both the critical and subcritical states to investigate the influence of different thermal neutron profiles on the thorium capture and fission reactions. Thorium plate irradiation experiments for the thorium capture and fission reactions demonstrate fission reactions in the critical state, and the calculated-to-experiment values of reaction rates show accuracy within a relative difference of ∼30%. In the ADS experiments with an external neutron source (14-MeV neutrons and 100-MeV protons), subcritical experiments were carried out in the thorium-loaded cores to investigate the influence of different thermal neutron profiles on thorium capture reaction rates by the measurement of 115In(n,γ)116mIn reactions. The results reveal the difference between reaction rate distributions attributed to varying not only the neutron spectrum of the core but also the external neutron source. A comparison between the measured and calculated reaction rate distributions reflects the accuracy of reaction-rate analyses for the thorium-loaded ADS experiments with an external neutron source. Additionally, kinetic experiments were carried out to deduce the prompt neutron decay constants and subcriticality by the pulsed neutron method.
