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.
Explore membership for yourself or for your organization.
Conference 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!
Latest Magazine Issues
Jul 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
August 2025
Nuclear Technology
Fusion Science and Technology
July 2025
Latest News
Hash Hashemian: Visionary leadership
As Dr. Hashem M. “Hash” Hashemian prepares to step into his term as President of the American Nuclear Society, he is clear that he wants to make the most of this unique moment.
A groundswell in public approval of nuclear is finding a home in growing governmental support that is backed by a tailwind of technological innovation. “Now is a good time to be in nuclear,” Hashemian said, as he explained the criticality of this moment and what he hoped to accomplish as president.
L. D. Noble, P. Greebler, G. R. Pflasterer, Jr., B. U. B. Sarma, D. Wintzer
Nuclear Technology | Volume 10 | Number 1 | January 1971 | Pages 5-10
Technical Paper and Note | Reactor | doi.org/10.13182/NT71-A30941
Articles are hosted by Taylor and Francis Online.
The minimum critical core size for the Southwest Experimental Fast Oxide Reactor was predicted prior to the initial fuel loading using the results of a critical mockup in ZPR-3. The predicted minimum critical loading was 519 PuO2-UO2 fuel rods containing 285 kg of fissile (239Pu + 241Pu) plutonium, with 1 beryllium oxide tightener rod for each 6 fuel rods. The actual minimum critical loading was equivalent to a core containing 518 standard fuel rods and the nominal 6-to-1 ratio of fuel-to-tightener rods. The calculations used in the prediction are described and the agreement between experiment and calculation is discussed.
