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Nuclear Nonproliferation Policy
The mission of the Nuclear Nonproliferation Policy Division (NNPD) is to promote the peaceful use of nuclear technology while simultaneously preventing the diversion and misuse of nuclear material and technology through appropriate safeguards and security, and promotion of nuclear nonproliferation policies. To achieve this mission, the objectives of the NNPD are to: Promote policy that discourages the proliferation of nuclear technology and material to inappropriate entities. Provide information to ANS members, the technical community at large, opinion leaders, and decision makers to improve their understanding of nuclear nonproliferation issues. Become a recognized technical resource on nuclear nonproliferation, safeguards, and security issues. Serve as the integration and coordination body for nuclear nonproliferation activities for the ANS. Work cooperatively with other ANS divisions to achieve these objective nonproliferation policies.
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2025 ANS Annual Conference
June 15–18, 2025
Chicago, IL|Chicago Marriott 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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High-temperature plumbing and advanced reactors
The use of nuclear fission power and its role in impacting climate change is hotly debated. Fission advocates argue that short-term solutions would involve the rapid deployment of Gen III+ nuclear reactors, like Vogtle-3 and -4, while long-term climate change impact would rely on the creation and implementation of Gen IV reactors, “inherently safe” reactors that use passive laws of physics and chemistry rather than active controls such as valves and pumps to operate safely. While Gen IV reactors vary in many ways, one thing unites nearly all of them: the use of exotic, high-temperature coolants. These fluids, like molten salts and liquid metals, can enable reactor engineers to design much safer nuclear reactors—ultimately because the boiling point of each fluid is extremely high. Fluids that remain liquid over large temperature ranges can provide good heat transfer through many demanding conditions, all with minimal pressurization. Although the most apparent use for these fluids is advanced fission power, they have the potential to be applied to other power generation sources such as fusion, thermal storage, solar, or high-temperature process heat.1–3
L. A. Kull, R. L. Bramblett, T. Gozani, D. E. Rundquist
Nuclear Science and Engineering | Volume 39 | Number 2 | February 1970 | Pages 163-169
Technical Paper | doi.org/10.13182/NSE70-A21196
Articles are hosted by Taylor and Francis Online.
The time behavior of delayed neutrons from the photofission of 238U and 235U was measured for bremsstrahlung endpoint energies of 8- and 10-MeV. The data were analyzed to determine the relative abundances (βi) of the delayed-neutron groups assuming the observed time distribution can be adequately described by six groups. A comparison of the 238U results at 8- and 10-MeV, and other results at 15-MeV show no strong dependence of the βi on endpoint energy. In the case of 235U, no large differences were observed between the βi at 8- and 10-MeV, however there are marked variations for several groups at 15 MeV. Possible causes for the observed differences in the βi with endpoint energy are discussed. No evidence was found for the existence of a delayed-neutron group with a half-life in the 10 to 100 msec region
