ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Explore membership for yourself or for your organization.
Conference 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!
Latest Magazine Issues
Aug 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
August 2025
Fusion Science and Technology
Latest News
Ho Nieh nominated to the NRC
Nieh
President Trump recently nominated Ho Nieh for the role of commissioner in the Nuclear Regulatory Commission through the remainder of a term that will expire June 30, 2029.
Nieh has been the vice president of regulatory affairs at Southern Nuclear since 2021, though he is currently working as a loaned executive at the Institute of Nuclear Power Operations, where he has been for more than a year.
Nieh’s experience: Nieh started his career at the Knolls Atomic Power Laboratory, where he worked primarily as a nuclear plant engineer and contributed as a civilian instructor in the U.S. Navy’s Nuclear Power Program.
From there, he joined the NRC in 1997 as a project engineer. In more than 19 years of service at the organization, he served in a variety of key leadership roles, including division director of Reactor Projects, division director of Inspection and Regional Support, and director of the Office of Nuclear Reactor Regulation.
Donald J. Reif
Nuclear Technology | Volume 83 | Number 2 | November 1988 | Pages 190-196
Technical Paper | Chemical Processing | doi.org/10.13182/NT88-A34160
Articles are hosted by Taylor and Francis Online.
Solvent extraction processes are used to recover usable nuclear materials from unwanted fission products at the Savannah River Plant. During use, the tri-n-butyl phosphate in an n-paraffm hydrocarbon solvent is degraded due to hydrolysis and radiolysis, forming materials that influence product losses, product decontamination, and separation efficiencies. The solvent is recycled after cleaning with a sodium carbonate solution. Savannah River Laboratory work has shown that carbonate washing does not remove more solvent-soluble binding ligands (formed by solvent degradation), which extract fission products into the solvent. Activated alumina treatment of carbonate-washed solvent removes binding ligands and significantly improves recycled solvent performance. A laboratory-developed, side-stream-activated alumina process was scaled up to clean 16500 gal of first-cycle solvent. The improved solvent fission product rejection returned the Savannah River Plant Canyon process to normal productivity and reduced process salt waste by increasing the solvent wash solution use-life.
