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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.
Kostadin A. Dinov, Kazuo Kasahara
Nuclear Technology | Volume 115 | Number 1 | July 1996 | Pages 81-90
Technical Paper | Material | doi.org/10.13182/NT96-A35277
Articles are hosted by Taylor and Francis Online.
A theoretical approach is discussed that regards the kinetically determined pressurized water reactor (PWR) primary system as a set of thermodynamically defined metastable states that the related high-temperature aqueous system containing a combination of possible oxide phases (NixFe3−xO4, Fe3O4, and metallic nickel or NiO) and corresponding dissolution products may undergo under specified initial conditions. The study shows that stability zones of those metastable states, particularly M1 (NixFe3−xO4) and M3 [Ni(m) + NixFe3−xO4], cover practically the entire PWR operational range and depend on specific plant conditions and applied chemistry control. The thermodynamic analysis is predicated on the belief that defining the stability transition boundary between those states — found as a function of temperature, coolant pH, dissolved hydrogen (DH), and ferrite stoichiometry (x value) — is of primary importance for corrosion product behavior. Such a stability change influences both the particulate and ionic levels and the related activity transport and should be regarded as an important factor in optimizing PWR primary chemistry. The study offers an original approach to reassessing such important issues as thermodynamic data and the solubility of spinel oxides, the role of transport of particulates and soluble species, “optimum” pH and DH, and the chemistry effect on crud burst.
