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
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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Beyond borders
Lisa Marshallpresident@ans.org
Global partnerships advance the nuclear enterprise, demonstrating commitment to energy security, supply chain buildout, and economic and human development. Collaborations remain imperative, keeping these things in mind:
Approximately half of the 400-GW reactor fleet will be retiring by 2040.1
The forecasted need for new nuclear is 300–600 GW by 2050.
There is a need to counter the build-own-operate model.2
Appropriate funding and financing mechanisms are needed.
Host country regulatory oversight is paramount.
By 2050, there will be 4 million nuclear professionals supporting the industry.3
Lee G. Glascoe, Thomas A. Buscheck, James Gansemer, Yunwei Sun, Kenrick Lee
Nuclear Technology | Volume 148 | Number 2 | November 2004 | Pages 125-137
Technical Paper | High-Level Radioactive Waste Disposal | doi.org/10.13182/NT04-A3553
Articles are hosted by Taylor and Francis Online.
The MultiScale ThermoHydrologic Model (MSTHM) is used to predict thermal-hydrologic conditions in emplacement drifts and the adjoining host rock throughout a proposed nuclear waste repository. This modeling effort simulates a lower-temperature operation mode with a different panel loading than the repository currently being considered for the Yucca Mountain license application. Simulations address the influence of repository-scale thermal-conductivity heterogeneity and the influence of preclosure operational factors on thermal-loading conditions. MSTHM can accommodate a complex repository layout, a development that, along with other improvements, enables more rigorous analyses of preclosure operational factors. Differences in MSTHM output occurring with these new capabilities are noted for a new sequential waste-package-loading technique compared with a standard simultaneous-loading technique. Alternative approaches to modeling repository-scale thermal-conductivity heterogeneity in the host-rock units are investigated, and a study incorporating geostatistically varied host-rock thermal conductivity is discussed.
