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Nuclear Criticality Safety
NCSD provides communication among nuclear criticality safety professionals through the development of standards, the evolution of training methods and materials, the presentation of technical data and procedures, and the creation of specialty publications. In these ways, the division furthers the exchange of technical information on nuclear criticality safety with the ultimate goal of promoting the safe handling of fissionable materials outside reactors.
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2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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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!
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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.
Masahiko Arai
Nuclear Science and Engineering | Volume 74 | Number 2 | May 1980 | Pages 77-83
Technical Paper | doi.org/10.13182/NSE80-A19624
Articles are hosted by Taylor and Francis Online.
One-dimensional two-phase flow equations, describing mass and momentum equations for two phases, are used to analyze viscous term contributions to stability problems concerning two-phase flow equation systems. When viscous terms are taken into account, characteristics of the system become real. This paper shows that viscous terms stabilize disturbances, if the ratio of the system's dimension to the wavelength is sufficiently larger than the Reynolds numbers for the two phases. Some examples show that this result holds, when differential terms are added. An example of stable systems for any wavelength perturbations is given by adding a simple wall shear-like stress term. These results are obtained by the use of a linear stability analysis.