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
Materials Science & Technology
The objectives of MSTD are: promote the advancement of materials science in Nuclear Science Technology; support the multidisciplines which constitute it; encourage research by providing a forum for the presentation, exchange, and documentation of relevant information; promote the interaction and communication among its members; and recognize and reward its members for significant contributions to the field of materials science in nuclear technology.
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.
Felix C. Difilippo
Nuclear Science and Engineering | Volume 104 | Number 2 | February 1990 | Pages 123-134
Technical Paper | doi.org/10.13182/NSE90-A23709
Articles are hosted by Taylor and Francis Online.
The harmonic expansion of the detector field of view in terms of direct and adjoint kinetic eigenfunctions together with the use of a modified version of the Schottky prescription of the equivalent source of noise make possible the harmonic analysis of stochastic descriptors used in the measurement of kinetic parameters. The results are general in the sense that they do not depend on the approximations of the Boltzmann operator, the distribution of fissile materials, or the multiplicity of the neutron source that drives the subcritical system. The results are applied to analyze the particular case of a system driven by a 252Cf source, with the californium deposited in one of the electrodes of a fission chamber and monitored by two sets of neutron detectors. This analysis is oriented toward the interpretation of experiments to measure reactivities with the stochastic method of the 252Cf source (ratio method). The theory is then used to synthesize stochastic observables using a simple approximation of the Boltzmann operator, i.e., two-point kinetics, which show the general features of the spatial effects observed experimentally.