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Division Spotlight
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
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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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Nuclear Science and Engineering
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Nuclear Technology
Fusion Science and Technology
Latest News
ARPA-E announces $40 million to develop transmutation technologies for UNF
The Department of Energy’s Advanced Research Projects Agency–Energy (ARPA-E) announced $40 million in funding to develop cutting-edge technologies to enable the transmutation of used nuclear fuel into less-radioactive substances. According to ARPA-E, the new initiative addresses one of the agency’s core goals as outlined by Congress: to provide transformative solutions to improve the management, cleanup, and disposal of radioactive waste and spent nuclear fuel.
B. J. Kern, D. L. Sadowski, S. M. Ghiaasiaan, S. I. Abdel-Khalik
Fusion Science and Technology | Volume 52 | Number 4 | November 2007 | Pages 958-962
Technical Paper | Inertial Fusion Technology: Drivers and Advanced Designs | doi.org/10.13182/FST07-A1618
Articles are hosted by Taylor and Francis Online.
Compressible two-phase (liquid/gas) jets have been proposed as a means of protecting the chamber walls in high-yield, low repetition rate, Z-Pinch IFE reactor systems. The aspect ratio (height-to-thickness/diameter ratio) of such jets is expected to be large, so that the void fraction may vary significantly along the flow direction. An experimental investigation was conducted to determine the effect of various design and operational parameters on the void fraction distribution within a planar, downward-flowing, two-phase (liquid/gas) free jet. An air/water jet with an initial cross section of 1.0 cm × 10.0 cm was used, and different liquid inlet velocities and gas-to-liquid volumetric flow rate ratios were tested. Local void fractions at different locations along the width and length of the jets were measured by gamma-ray densitometry. The results indicated that buoyancy caused significant slip between the two phases, leading to the conclusion that homogeneous two-phase flow models cannot accurately model the behavior of such jets. The data obtained in this investigation can be used to validate predictions of mechanistic models for jet dynamics and shock attenuation.