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
2025 ANS Annual Conference
June 15–18, 2025
Chicago, IL|Chicago Marriott 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!
Latest Magazine Issues
May 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
June 2025
Nuclear Technology
Fusion Science and Technology
Latest News
NRC v. Texas: Supreme Court weighs challenge to NRC authority in spent fuel storage case
The State of Texas has not one but two ongoing federal court challenges to the Nuclear Regulatory Commission that could, if successful, turn decades of NRC regulations, precedent, and case law on its head.
R. Böhme, H. Seufert
Nuclear Technology | Volume 7 | Number 6 | December 1969 | Pages 494-504
Reactor | doi.org/10.13182/NT69-A28368
Articles are hosted by Taylor and Francis Online.
An absolute determination of uranium reaction rates by means of foil irradiation was carried out in the Fast Zero Power Reactor SNEAK, assembly 3A-2 This requires the measurement of reactionrate traverses as well as their fine structure. These rate distributions were compared with transport and diffusion calculations. The traverse measurements indicate a strong dependence of the axial “buckling” (relative second derivative of the rates) on energy. The calculations with the Karlsruhe SNEAK cross-section set and the Russian ABN set yield these bucklings for 238U capture and 235U fission in diffusion approximation on the average 5% higher than measured. Only the fast-fission rate distribution of 238U is almost correctly calculated using the cross-section sets. The ratio of total plutonium production to 235u fission along the z axis was measured and compared with theory. It agrees within the error limits of the experiment. Beyond the error limits are the discrepancies found for the spectral index σƒ28/σƒ25 The fine structure of reaction rates within the fuel platelets is well described by an integral transport code, but again, there are considerable discrepancies between calculated and measured fission-rate ratios.
