ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
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Division Spotlight
Young Members Group
The Young Members Group works to encourage and enable all young professional members to be actively involved in the efforts and endeavors of the Society at all levels (Professional Divisions, ANS Governance, Local Sections, etc.) as they transition from the role of a student to the role of a professional. It sponsors non-technical workshops and meetings that provide professional development and networking opportunities for young professionals, collaborates with other Divisions and Groups in developing technical and non-technical content for topical and national meetings, encourages its members to participate in the activities of the Groups and Divisions that are closely related to their professional interests as well as in their local sections, introduces young members to the rules and governance structure of the Society, and nominates young professionals for awards and leadership opportunities available to members.
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.
Jorma Karppinen, Rob M. Versluis, Bjørn Blomsnes
Nuclear Science and Engineering | Volume 71 | Number 1 | July 1979 | Pages 1-17
Technical Paper | doi.org/10.13182/NSE79-A20325
Articles are hosted by Taylor and Francis Online.
The problem of controlling the total power and power distribution in a large pressurized water reactor (PWR) core to follow a known time-varying load schedule has been formulated as a multistage optimization problem. The control problem is solved subject to hard constraints, which can be applied on total power, control variables and their rate of change, local power densities and their rate of change, and on more global power distribution measures such as axial and quadrant offsets. Based on a three-dimensional linearized nodal core model with some slightly nonlinear features, the optimal control problem is solved by quadratic programming. The method, called multistage mathematical programming, has been studied in simulations. A large PWR core, which was unstable with respect to both axial and azimuthal xenon oscillations, was represented by a simplified three-dimensional nonlinear nodal core simulator model. The three-dimensional oscillations were successfully damped at constant load, and an efficient anticipatory control was obtained for load cycling operation.
