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
Jul 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
August 2025
Fusion Science and Technology
Latest News
Deep geologic repository progress—2025 Update
Editor's note: This article has was originally published in November 2023. It has been updated with new information as of June 2025.
Outside my office, there is a display case filled with rock samples from all over the world. It contains a disk of translucent, orange salt from the Waste Isolation Pilot Plant near Carlsbad, N.M.; a core of white-and-bronze gneiss from the site of the future deep geologic repository in Eurajoki, Finland; several angular chunks of fine-grained, gray claystone from the underground research laboratory at Bure, France; and a piece of coarse-grained granite from the underground research tunnel in Daejeon, South Korea.
J. J. MacFarlane, P. Wang, G. A. Moses
Fusion Science and Technology | Volume 19 | Number 3 | May 1991 | Pages 703-708
Inertial Fusion | doi.org/10.13182/FST91-A29427
Articles are hosted by Taylor and Francis Online.
We present results from radiation transport calculations for plasma conditions that are expected for the buffer gases of high-gain inertial confinement fusion (ICF) target chambers. In our calculations, the plasmas are not assumed to be in local thermodynamic equilibrium (LTE). The state of the plasmas is obtained by solving multilevel atomic rate equations self-consistently with the radiation field. Radiation is transported using an escape probability model. Atomic physics data is generated using a combination of Hartree-Fock, distorted wave, and semi-classical impact parameter models. Our results show that the self-attenuation of line radiation results in a significant reduction in the radiation flux at the target chamber first wall. We compare our results with those from other calculations and find that the heat fluxes at the first wall are significantly lower than previously predicted by multigroup radiation diffusion models. The lower heat fluxes suggest that thermal conduction within the first wall can act to keep temperatures near the surface of the wall much lower than previously thought, thus reducing problems associated with thermal stresses and vaporization. We discuss the ramifications of our results for the SIRIUS-T ICF reactor.