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Division Spotlight
Young Members Group
The Young Members Group works to encourage and enable all young professional members to be actively involved in the efforts and endeavors of the Society at all levels (Professional Divisions, ANS Governance, Local Sections, etc.) as they transition from the role of a student to the role of a professional. It sponsors non-technical workshops and meetings that provide professional development and networking opportunities for young professionals, collaborates with other Divisions and Groups in developing technical and non-technical content for topical and national meetings, encourages its members to participate in the activities of the Groups and Divisions that are closely related to their professional interests as well as in their local sections, introduces young members to the rules and governance structure of the Society, and nominates young professionals for awards and leadership opportunities available to members.
Meeting 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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Latest News
NRC cuts fees by 50 percent for advanced reactor applicants
The Nuclear Regulatory Commission has announced it has amended regulations for the licensing, inspection, special projects, and annual fees it will charge applicants and licensees for fiscal year 2025.
D. E. Horner, D. J. Grouse, K. B. Brown, B. Weaver
Nuclear Science and Engineering | Volume 17 | Number 2 | October 1963 | Pages 234-246
Solvent Extraction Chemistry Symposium. Part II. | doi.org/10.13182/NSE63-A28885
Articles are hosted by Taylor and Francis Online.
Increasing industrial, military, and space requirements for certain fission products places emphasis on new and large-scale methods for their recovery from reactor process waste liquors. With recent developments of new organic extractants for these fission products, solvent extraction offers a versatile alternate technology to ion-exchange, precipitation, and crystallization technologies heretofore used for small-scale recoveries. A process flowsheet has been developed for recovery of strontium and mixed rare earths from adjusted Purex 1WW using di(2-ethylhexyl)phosphoric acid (D2EHPA). After addition of tartrate to complex iron and caustic to adjust the pH to 6, strontium and rare earths are coextracted, then co-stripped with HNO3 in the first cycle. In additional D2EHPA extraction cycles, they are isolated as concentrated fractions. The mixed rare earths from this process can be treated by TBP extraction to separate the individual rare earth elements of which promethium and cerium are of greatest interest. Zirconium-niobium also may be recovered with D2EHPA from acidic waste liquors. An amine pretreatment extraction process has been developed which removes nitric acid, iron sulfate, zirconium-niobium, and ruthenium from waste solutions to furnish a feed liquor more amenable to subsequent fission product recovery processes. The separate recovery of ruthenium, zirconium-niobium, and rare earths may also be possible by amine extraction. A process has been developed for recovery of cesium from alkaline waste solutions using substituted phenols. These compounds are selective extractants for cesium, giving high decontamination from other fission products and sodium. They are readily stripped with dilute HNO3. Previous studies have also outlined methods for recovering neptunium, plutonium, and technetium with solvents similar to those described here. When appropriately combined, these developments offer a versatile integrated solvent extraction flowsheet for recovery of all important fission products and other components from waste liquors.
