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.
Gérard Ducros
Nuclear Technology | Volume 68 | Number 3 | March 1985 | Pages 370-384
Technical Paper | Nuclear Fuel | doi.org/10.13182/NT85-A33582
Articles are hosted by Taylor and Francis Online.
Within the framework of nondestructive inspection of irradiation rigs carried out in the pool of the 35-MW Siloe reactor in Grenoble, transverse gamma scanning has been developed. It permits radial distribution of the fission products in irradiated fuels to be determined and, therefore, considerable improvement to be made in the knowledge of their behavior. A new method of transverse measurement treatment has recently been elaborated: the ISARD program reconstructs the distribution of gamma emitters in a section of the fuel pin from several scans carried out under different incidences. The algorithm is built on a combination of two iterative methods and allows a limited number of projections to be used without assuming any particular symmetry, taking the selfattenuation of gamma rays in the fuel element and their absorption by the rig walls into account. The ISARD program has been qualified experimentally, using a sample composed of various materials activated in the reactor. The sample and the irradiation were designed to simulate a large number of different distributions of gamma emitters (i.e., activation products), similar to typical repartitions of fission products in a fuel pin (peripheral or central concentrations, local accumulation or voids . . . ). This qualifying study, treated parametrically, allowed practical choices to be made as to the routine application of the method to irradiated fuel pins.
