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
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
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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Apr 2025
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Nuclear Science and Engineering
June 2025
Nuclear Technology
Fusion Science and Technology
May 2025
Latest News
Argonne’s METL gears up to test more sodium fast reactor components
Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.
Ben Frisk, Christopher Hope (NuScale Power)
Proceedings | Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technolgies (NPIC&HMIT 2019) | Orlando, FL, February 9-14, 2019 | Pages 290-295
The purpose of this paper is to describe gaps found in programmatic verification activities for safety-critical systems based on field programmable gate array (FPGA) technology; specifically, by comparing the more mature methods used by other regulated industries that commonly use FPGAs and those mandated in the traditional software-based framework of the legacy commercial nuclear power generating industry. This paper also describes the strategies used by NuScale Power, LLC (NuScale) to fill the identified gaps, while maintaining its conformance to IEEE 1012-2004. In addition, the purpose of this paper is to inform and encourage consideration of why the 2004 version of IEEE 1012 is outdated for its application to the commercial nuclear power industry, especially as adoption of non-microprocessor based digital technology becomes widespread. Currently, the regulatory process for ensuring quality and safety for digital plant protection systems specifies independent verification and validation (IV&V) as outlined in IEEE 1012-2004 and endorsed by Regulatory Guide 1.168, Revision 2. Simply put, the reason to move away from the 2004 version and adoption of the 2016 version is due to the holistic systems-based life cycle that is inclusive of hardware, software, and their interfaces, which is now specified in the new version of IEEE 1012 (version 2016). The systems-based strategy is a key factor needed to ensure functional safety and quality throughout the verification and validation process. This is especially true for FPGA-based systems, as there is a tendency to think this technology should be treated only as hardware. This paper will identify critical differences between the versions of IEEE 1012 and explain why the NuScale IV&V program is looking outside of the commercial nuclear industry for methods better suited to FPGA-based I&C systems. In closing, this paper is intended to describe portions of the NuScale IV&V program that meets the requirements specified in IEEE 1012-2004, but also combines innovation with lessons learned from nonnuclear industries used to develop FPGA-based safety I&C systems.
