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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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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.
G. E. Goring
Nuclear Science and Engineering | Volume 29 | Number 2 | August 1967 | Pages 180-188
Technical Paper | doi.org/10.13182/NSE67-A18526
Articles are hosted by Taylor and Francis Online.
Established techniques for measuring thermal reactor flux and power which utilize, respectively, arbitrary placement of foils and overall heat balance, have limited accuracy and are difficult to apply. The proposed method is based on 135Xe accumulation, as manifested by control-rod positions, plus a set of relative flux factors taken over the entire core instead of only at isolated positions. The technique involves only routine operating data, and required calculations are quite manageable by machine computation. After development of the theory, application is illustrated using a set of data from the Union Carbide Nuclear Company research reactor at Tuxedo, New York. Results are quite reliable when rod positions during the shutdown period are used, but operating period ratios introduce large inaccuracies by magnification of routine imprecision in operating data. It is concluded that the method offers an easily obtainable check on the usual heat-balance information for heterogeneous reactors, particularly if applied to shutdown data or to a xenon equilibrium run.