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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
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!
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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.
R. D. M. Garcia
Nuclear Science and Engineering | Volume 144 | Number 3 | July 2003 | Pages 200-210
Technical Paper | doi.org/10.13182/NSE03-A2353
Articles are hosted by Taylor and Francis Online.
A new numerical method for computing first-flight collision, escape, and transmission probabilities in three dimensions is described. The method consists of subdividing the domain into parts called elements and assuming, as an approximation, that the interaction between a source element and a sink element takes place only along the path that joins their centers of mass. The calculation is repeated with the number of elements increased successively and Richardson extrapolation to an infinite number of elements applied to the sequence of results until convergence to the desired degree of accuracy is attained. Solutions to some test problems indicate that, in general, four steps of repeated Richardson extrapolation are sufficient to yield results with an accuracy comparable to that of existing codes.