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
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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June 2025
Nuclear Technology
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May 2025
Latest News
Argonne’s METL gears up to test more sodium fast reactor components
Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.
S. B. Gunst, D. E. Conway, J. C. Connor
Nuclear Science and Engineering | Volume 56 | Number 3 | March 1975 | Pages 241-262
Technical Paper | doi.org/10.13182/NSE75-A26738
Articles are hosted by Taylor and Francis Online.
Samples of 235U, 233U, 239Pu, and 232Th have been irradiated in high neutron fluxes [>1014 n/ (cm2 sec)] and their decay heat has been measured as a function of cooling time ranging from 14 to 4500 h after removal from the high flux. To measure the rate of heat emission, an underwater calorimeter has been developed. For the measured exposure histories, decay heat has also been calculated for concentrations of 190 fission products, all significant heavy isotopes, and structural nuclides. Account is taken of the energy carried by gamma rays that escape the calorimeter. Measurements and calculations of the decay heat captured within the calorimeter agree within two standard deviations for all samples and cooling times and, in general, agree within 2%. For the 235U sample, calculations based on the Proposed ANS Standard ANS-5.1 (ANSI N18.6) agree with the measurements within a few percent.
