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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!
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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.
D. Ostermann, C. Krumb, R. Krieg
Nuclear Science and Engineering | Volume 179 | Number 2 | February 2015 | Pages 211-231
Technical Paper | doi.org/10.13182/NSE14-3
Articles are hosted by Taylor and Francis Online.
During postulated severe accidents in nuclear power plants, steel sheets and shells may suffer high plastic strains up to several percent. In contrast, for design-basis accidents the strains are within lower limits of the order of 0.2% required by the given rules. In both cases the margins up to structural fracture are of vital interest. In sheets and shells these margins may be reduced by diffuse as well as localized necking. Therefore, this paper investigates the remaining structural deformability described by the uniform elongation strain, where diffuse necking starts, and the quasi-uniform elongation strain, where localized necking starts. The theoretical models developed recently for thin sheets under uniaxial loading are extended to account for biaxial loading. Major findings are confirmed by appropriate structural experiments. Based on these results and their scatter, strain limits are recommended for steel sheets and shells under accident loading, such that fracture can be excluded. The strains caused by the accidents discussed in this paper turn out to be below these limits.