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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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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Deep Space: The new frontier of radiation controls
In commercial nuclear power, there has always been a deliberate tension between the regulator and the utility owner. The regulator fundamentally exists to protect the worker, and the utility, to make a profit. It is a win-win balance.
From the U.S. nuclear industry has emerged a brilliantly successful occupational nuclear safety record—largely the result of an ALARA (as low as reasonably achievable) process that has driven exposure rates down to what only a decade ago would have been considered unthinkable. In the U.S. nuclear industry, the system has accomplished an excellent, nearly seamless process that succeeds to the benefit of both employee and utility owner.
Richard A. Hendrickson, Glenn Murphy
Nuclear Science and Engineering | Volume 31 | Number 2 | February 1968 | Pages 215-221
Technical Paper | doi.org/10.13182/NSE68-A18233
Articles are hosted by Taylor and Francis Online.
A method is developed to determine the ratio of the reactivity coupling coefficient to the mean generation time in a two-slab reactor based on experimental measurements of the inherent reactor-noise spectrum. A matrix formulation of the cross-spectral density function of the fluctuating neutron density at two experimental access locations adjacent to the cores is used in conjunction with a two-point reactor model to show that the real part of the cross-spectral density vanishes at a particular frequency, termed the sink frequency. The sink frequency is a function of the ratio of the reactivity coupling coefficient to generation time in the cores and the times required for neutron disturbances to travel between the cores and the detector locations. Experimental results from the UTR-10 reactor verify the predicted behavior of the cross-spectral density function in the neighborhood of the sink frequency and provide an at-critical measurement of the reactivity coupling coefficient.
