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Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
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2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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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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EPA issues final rule regulating “forever chemicals”
The Environmental Protection Agency announced that it will issue a rule aimed at limiting public exposure to per- and polyfluoroalkyl substances (PFAS). The final rule will designate two widely used PFAS chemicals, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), as hazardous substances under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), also known as Superfund.
According to the EPA, both PFOA and PFOS meet the statutory criteria for designation as hazardous substances.
Michael Epstein, Hans K. Fauske, Charles F. Askonas, Marc A. Vial, Patricia Paviet-Hartmann
Nuclear Technology | Volume 163 | Number 2 | August 2008 | Pages 294-306
Technical Paper | Reprocessing | doi.org/10.13182/NT08-A3989
Articles are hosted by Taylor and Francis Online.
Adiabatic calorimetry testing was performed to determine the Arrhenius relations for the chemical self-heat rates generated by the oxidation of tri-n-butyl phosphate saturated with nitric acid ("organic phase"). The adiabatic calorimetry tests showed that the runaway reaction is tempered at ~109°C when the organic phase rests on top of a layer of aqueous nitric acid ("aqueous phase"). It is believed that tempering in the laboratory-scale two-layer organic/aqueous system is mainly due to the upward transport of dissolved water from the aqueous phase to the organic phase where the water evaporates into rising reaction product gas bubbles. The rate of water transport depends strongly on the location and rate of product gas bubble generation. Isothermal tests were performed that clearly reveal that the reaction product gas bubbles originate in the underlying aqueous layer and that their rate of generation is bubbling enhanced reactant mass transfer controlled. A semiempirical expression for the rate of gas generation was developed from the measurements and from available correlations on enhanced mass transfer in bubbling pools. The empirical and semiempirical relations reported here for chemical self-heat rates and reaction product gas production are necessary to determine the thermal stability boundaries of single-layer and two-layer systems, predictions of which appear in the companion paper, "Thermal Stability and Safe Venting of the Tri-N-Butyl Phosphate-Nitric Acid-Water ("Red Oil") System - III: Predictions of Thermal Stability Boundaries and Required Vent Size," Nuclear Technology, Vol. 163, p. 307 (2008).