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Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
Nuclear and Emerging Technologies for Space (NETS 2023)
May 7–11, 2023
Idaho Falls, ID|Snake River Event Center
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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Nuclear Science and Engineering
Fusion Science and Technology
The blossoming of cooperation between the U.S. and Canada
The United States and Canadian nuclear industries used to be an example of how two independent teams of engineers facing an identical problem—making electricity from uranium—could come up with completely different answers. In the 1950s, Canada began designing a reactor with tubes, heavy water, and natural uranium, while in the U.S. it was big pots of light water and enriched uranium.
But 80 years later, there is a remarkable convergence. The North American push for a new generation of nuclear reactors, mostly small modular reactors (SMRs), is becoming binational, with U.S. and Canadian companies seeking markets and regulatory certification on both sides of the border and in many cases sourcing key components in the other country.
Weixiong Zheng, Ryan G. McClarren
Nuclear Science and Engineering | Volume 183 | Number 1 | May 2016 | Pages 78-95
Technical Paper | doi.org/10.13182/NSE15-48
Articles are hosted by Taylor and Francis Online.
We investigate the calibration of the uncertainties of thermal scattering of ZrHx in the fuel material in TRIGA reactor simulations. Thermal scattering cross sections of ZrHx are heavily affected by the solid-state frequency distributions, also called phonon spectra. In previous work, we proposed parameterized phonon spectrum models and explored the effects on quantities of interest (QoIs) of changing spectra with such models by varying the parameters. In this work, we establish a more general calibration framework for the phonon spectrum of ZrHx. To accomplish this calibration, we introduce two emulators, Gaussian process regression and Bayesian multivariate adaptive regression splines, to create a map from the input parameters to the QoIs into the calibration framework. Using these emulators, we perform calibrations using the emulation results with the same QoIs at 600 K. Test simulations using data generated with calibrated parameters show that uncertainties of the QoIs shrink over 50%. Moreover, we extend the test to the reactivity at a different temperature, 293.6 K, as an extrapolated test of the calibration, and obtained results close to those of the surrogate experiment. The efficacy and efficiency of implementing emulators in the calibration framework are demonstrated.