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
Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
Meeting Spotlight
2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
October 2024
Nuclear Technology
Fusion Science and Technology
August 2024
Latest News
New laws offer nuclear industry incentives for existing power plant uprates
This year, the U.S. nuclear industry received a much-needed economic boost that could help preserve operating nuclear power plants and incentivize upgrades that extend their lifespan and power output.
Signed into law in 2022, the Inflation Reduction Act offers production tax credits (PTCs) for existing nuclear power plants and either PTCs or investment tax credits (ITCs) for new carbon-free generation. These credits could make power uprates—increasing the maximum power level at which a commercial plant may operate—a much more appealing option for utilities.
J. Hardy, Jr., G. G. Smith, J. A. Mitchell, D. Klein
Nuclear Science and Engineering | Volume 12 | Number 2 | February 1962 | Pages 301-308
Technical Paper | doi.org/10.13182/NSE62-A26071
Articles are hosted by Taylor and Francis Online.
The Dancoff correction factor (1 − C) for U238 resonance neutron capture was measured for cylindrical, 0.98 cm diameter fuel rods at lattice pitches of 1.81 cm and 1.44 cm. The rods were 1.3% U235, arranged in a hexagonal, H2O-moderated lattice. Measurements were done for three fuel materials: uranium metal, UO2 (density 10.5 gm/cm3), and UO2 (density 7.5 gm/cm3) according to the following method. The ratio of U238 epicadmium neutron capture per atom at rod surface to that at rod center, S/V, was measured, for each fuel composition, at both lattice pitches and in an isolated rod (i.e., no Dancoff interaction). The quantity R ≡ [(S − V)/V]lattice/[(S − V)/V]isolated rod was, within experimental error, the same for all three fuel materials at each lattice pitch. Furthermore, within experimental error, R was found to be equal to (1 − C), calculated at each lattice pitch from Dancoff's expression. This agreement was expected from an analysis of the experiment in terms of a current model of resonance capture which indicated that R equals (1 − C) multiplied by two factors: one accounting for lattice mutual shielding of capture at rod center, the other accounting for the effect on S/V of the resonance flux lethargy tilt (due to loss of neutrons by resonance capture). Approximate calculations of these two effects showed that each perturbs R by about 10% in the worst case. The effects oppose each other so that very closely R = 1 − C.