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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
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
DOE extends Centrus’s HALEU production contract by one year
Centrus Energy has announced that it has secured a contract extension from the Department of Energy to continue—for one year—its ongoing high-assay low-enriched uranium (HALEU) production at the American Centrifuge Plant in Piketon, Ohio, at an annual rate of 900 kilograms of HALEU UF6. According to Centrus, the extension is valued at about $110 million through June 30, 2026.
A. Z. Akcasu, C. M. Bost, Jr.
Nuclear Science and Engineering | Volume 47 | Number 1 | January 1972 | Pages 104-115
Technical paper | doi.org/10.13182/NSE72-A28423
Articles are hosted by Taylor and Francis Online.
The concept of multiple-input zero power describing functions is introduced in terms of the nonlinear response of a zero power reactor to a large periodic reactivity input, and the dual-input zero power describing function is calculated explicitly. The effect of amplitude and phase of the second input on the describing function is investigated numerically. The zero power describing function is used to construct the describing function at high power using closed loop feedback circuit theory. This approach allows nonlinear effects and feedback effects to be discussed separately. The nonlinear stability of a two-temperature reactor is investigated using the high power describing function and Nyquist stability criterion with particular attention to the existence and stability of limit cycles. In addition, the discrepancies between various definitions of the describing function are discussed and clarified.