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
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
Meeting Spotlight
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!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
April 2025
Fusion Science and Technology
Latest News
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Chan Eok Park, Jong Ho Choi, Gyu Cheon Lee, Sang Yong Lee
Nuclear Technology | Volume 205 | Number 1 | January-February 2019 | Pages 77-93
Technical Paper | doi.org/10.1080/00295450.2018.1501990
Articles are hosted by Taylor and Francis Online.
The system thermal-hydraulic code SPACE adopts a multidimensional two-fluid, three-field model to simulate two-phase-flow phenomena encountered during various anticipated transients and postulated accidents of pressurized water reactors. The applicable mesh systems include structured/staggered and unstructured/collocated ones. The staggered mesh system is based on the orthogonal hexahedral shape of cells and their surrounding faces, but it is generalized to describe not only multidimensional Cartesian meshes but also cylindrical meshes and one-dimensional pipe flow networks. The unstructured/collocated mesh system is used to represent more complex geometry using hexahedron, tetrahedron, pyramid, or prism shapes of cells. The structured/staggered mesh system hydraulic solver and the unstructured/collocated mesh system hydraulic solver are merged into a unified version of SPACE so that those hydraulic solvers can analyze simultaneously a complicated system comprising several structured and unstructured mesh blocks. In this paper, the governing equations, mesh systems, and numerical formulations for SPACE are introduced, and the application results are presented for several conceptual problems including the connection of heterogeneous mesh blocks.