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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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.
Robert S. Wick
Nuclear Science and Engineering | Volume 35 | Number 1 | January 1969 | Pages 118-126
Technical Paper | doi.org/10.13182/NSE69-A21120
Articles are hosted by Taylor and Francis Online.
Water-hammer theory is extended to the fuel assembly configuration of concentric annular fuel elements and flow passages. The analysis shows that due to the coupling of the hydraulic effects in adjacent coolant passages to each other through an elastic structure separating them, several modes of pressure wave propagation are possible. These compression (and rarefaction) waves travel at velocities less than the velocity of sound in the fluid depending on the dimensions of the fuel elements and flow passages. The existence of these compression and rarefaction waves traveling at different velocities leads to complex pressure disturbance patterns as a function of time, which may be of importance in fatigue analysis of the structure or possibly in determining whether or not voids could form as a result of the rarefaction waves. The analysis is general enough that it can be extended to include a wide variety of configurations when it is desirous to evaluate the effect of hydraulic pressure waves on fuel element performance.