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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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.
B. F. Myers, N. L. Baldwin, W. E. Bell
Nuclear Technology | Volume 35 | Number 2 | September 1977 | Pages 501-508
Fission Product Release | Coated Particle Fuel / Fuel | doi.org/10.13182/NT77-A31910
Articles are hosted by Taylor and Francis Online.
A review and analysis of available data on the release of fission gases from high-temperature gas-cooled reactor fuel particles indicates that the release of short-lived nuclides (half-life ≲5.3 days) occurs from the fissile material primarily by a mechanism involving recoil followed by gas-phase and bulk diffusion in the surrounding material at temperatures up to at least 1300°C (1573 K). The gas-phase contribution to the release of short-lived nuclides is dominant at temperatures below 600°C (873 K), and bulk diffusion is dominant at temperatures above 900°C (1173 K). Fission gas release to birth ratio (R/B) varies with half-life to a power of ∼0.2 at 300°C (573 K) and ∼0.5 at 1100°C (1373 K). For the short-lived isotopes, R/B is independent of burnup over the range from 0 to 63% FIMA in UC2 kernels; for dense ThO2 kernels, the data are insufficient to determine the burnup dependence. For the long-lived and stable isotopes, release from dense ThO2 kernels is strongly dependent on burnup. Iodine and tellurium isotopes may be treated as if they were xenon isotopes.