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Nuclear Criticality Safety
NCSD provides communication among nuclear criticality safety professionals through the development of standards, the evolution of training methods and materials, the presentation of technical data and procedures, and the creation of specialty publications. In these ways, the division furthers the exchange of technical information on nuclear criticality safety with the ultimate goal of promoting the safe handling of fissionable materials outside reactors.
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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
El Salvador: Looking to nuclear
In 2022, El Salvador’s leadership decided to expand its modest, mostly hydro- and geothermal-based electricity system, which is supported by expensive imported natural gas and diesel generation. They chose to use advanced nuclear reactors, preferably fueled by thorium-based fuels, to power their civilian efforts. The choice of thorium was made to inform the world that the reactor program was for civilian purposes only, and so they chose a fuel that was plentiful, easy to source and work with, and not a proliferation risk.
Rasito Tursinah, Sidik Permana, Zaki Su’ud, Alan Maulana, Putu Sukmabuana
Nuclear Technology | Volume 211 | Number 4 | April 2025 | Pages 635-644
Review Article | doi.org/10.1080/00295450.2024.2361177
Articles are hosted by Taylor and Francis Online.
The single-moderator neutron spectrometer is the result of developments in multisphere neutron spectrometer design. Multisphere is a multimoderator-based neutron spectrometer technique to measure the neutron spectrum with the most comprehensive energy range from electron-volt to gigaelectron-volt. Developing a multisphere into a single moderator aims to obtain a more practical device with regard to mobility and measurement techniques. We also review the layered-moderator design, a multisphere development with a single detector.
This paper ends with a review of the development of single-moderator designs with multidetectors, with regard to the various forms of moderators, types of detectors used, and validation results of each model. The development of the single-moderator neutron spectrometer in the geometric aspect of the moderator produces two dominant moderator shapes: spherical and cylindrical. The spherical shape is applied to measure the multidirectional neutron beam, while the cylindrical shape is used for the monodirectional beam. Validation results of 2.5% to 3.2% on single-sphere designs and 2% to 8% on single-cylindrical designs indicate that the developed single-moderate neutron spectrometer designs can replace multisphere-type spectrometers.