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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.
Meeting Spotlight
Conference on Nuclear Training and Education: A Biennial International Forum (CONTE 2025)
February 3–6, 2025
Amelia Island, FL|Omni Amelia Island Resort
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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Reboot: Nuclear needs a success . . . anywhere
The media have gleefully resurrected the language of a past nuclear renaissance. Beyond the hype and PR, many people in the nuclear community are taking a more measured view of conditions that could lead to new construction: data center demand, the proliferation of new reactor designs and start-ups, and the sudden ascendance of nuclear energy as the power source everyone wants—or wants to talk about.
Once built, large nuclear reactors can provide clean power for at least 80 years—outlasting 10 to 20 presidential administrations. Smaller reactors can provide heat and power outputs tailored to an end user’s needs. With all the new attention, are we any closer to getting past persistent supply chain and workforce issues and building these new plants? And what will the election of Donald Trump to a second term as president mean for nuclear?
As usual, there are more questions than answers, and most come down to money. Several developers are engaging with the Nuclear Regulatory Commission or have already applied for a license, certification, or permit. But designs without paying customers won’t get built. So where are the customers, and what will it take for them to commit?
Takashi Kiguchi, Hiroshi Motoda, Toshio Kawai
Nuclear Technology | Volume 17 | Number 2 | February 1973 | Pages 168-183
Technical Paper | Isotopes Separation | doi.org/10.13182/NT73-A31244
Articles are hosted by Taylor and Francis Online.
The parameters of a uranium-enriching cascade, i.e., the cut and the separation factor, are considered to be fluctuating stochastically. The covariance matrices of the total uranium flow and 235UF6 flow were derived by the classical stochastic theory for evaluating the effect of stochastic fluctuations of these parameters to steady-state plant performance. Also the stationary random process theory is applied to the kinetic equations of the cascade, and the autocorrelation function of the 235UF6 flow and enrichment is derived for evaluating the time behavior of the plant performance caused by random fluctuation of these system parameters. Numerical values illustrate the response of product flow and enrichment to the fluctuations, which are both time independent and dependent, of the cut and the separation gain of stages and centrifuges. These data lead to a conclusion concerning the tolerances of centrifuge parameters and stage controllers.