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.
Division Spotlight
Nuclear Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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
Mar 2025
Jul 2024
Latest Journal Issues
Nuclear Science and Engineering
March 2025
Nuclear Technology
Fusion Science and Technology
February 2025
Latest News
Prepare for the 2025 Nuclear PE Exam with ANS guides
The next opportunity to earn professional engineer (PE) licensure in nuclear engineering is this fall, and now is the time to sign up and begin studying with the help of materials like the online module program offered by the American Nuclear Society.
J. M. Davidson, L. O. Gates, and R. E. Nightingale
Nuclear Science and Engineering | Volume 26 | Number 1 | September 1966 | Pages 90-98
Technical Paper | doi.org/10.13182/NSE66-A17191
Articles are hosted by Taylor and Francis Online.
Radiation effects were determined in samples of borated graphite used as a neutron shield in the Enrico Fermi Power Plant. The material nominally contained 5 or 7 wt% boron as boron-carbide particles in a nuclear-graphite matrix. The graphite from the center of the graphitizing furnace had a shiny, grey appearance. Microscopy studies showed that the boron carbide had melted and the graphite particles were recrystallized. The remaining material had the usual dull black appearance of nuclear graphite., Most irradiation tests were conducted at 370 and 500°C to a total thermal-neutron dose of 2.5 × 1021 n/cm2 in a predominantly thermal-neutron spectrum. Dimensional changes and other radiation effects were much larger than those in nonborated materials. One grey sample expanded 3.3%, but dimensional changes and other property changes in the black materials were generally less., The radiation effects have been attributed primarily to carbon-atom displacements caused by the energetic lithium and helium atoms in the 10B(n,α)7Li reaction. The faster rate of damage in the grey material is believed to have been due to the finer dispersion of boron in the matrix. This finer dispersion would allow more of the helium and lithium atoms to escape from the boron-carbide particles and produce carbon-atom displacements., Preliminary tests in a neutron spectrum, where the ratio of thermal-to-fast neutrons was less than 1% of that in the flux utilized in the above experiments, produced much smaller changes for comparable fast-neutron doses. This is further evidence that most damage is caused by thermal neutrons.