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Division Spotlight
Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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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Christmas Night
Twas the night before Christmas when all through the houseNo electrons were flowing through even my mouse.
All devices were plugged in by the chimney with careWith the hope that St. Nikola Tesla would share.
Dong-Yuan Sheng, David Mauritzson, Sven Perzon (Westinghouse Electric Sweden), Karen Fujikawa, Bobby Bakshi (Westinghouse)
Proceedings | 2018 International Congress on Advances in Nuclear Power Plants (ICAPP 2018) | Charlotte, NC, April 8-11, 2018 | Pages 351-356
A full scale test program was designed to study the slip joint leakage flow instability. A number of cases were tested with different operating conditions and slip joint modifications (simulated wear). A Slip Joint Extension (SJE) design, developed by Westinghouse (WEC) that stabilizes the leakage flow was designed and installed. The design is applicable to a BWR/4 configuration. It is found that the vibration level with the WEC SJE installed is much lower than the baseline case and the high level vibration frequency seen in the baseline data is not presented with the fix installed.
A 3D CFD model is used to study the flow phenomena in the narrow gaps of slip joint. The result shows that leakage mass flow decreases and turbulence kinetic energy decrease significantly with the SJE design. This means that the extension of gap flow passage can effectively decrease the flow fluctuations to suppress the leakage-flow-induced vibration. The experimental and CFD results confirmed that the SJE offers a low-cost, low-risk effective solution that eliminates jet pump flow-induced vibration (FIV) by changing the flow across the slip joint from divergent (unstable) to convergent (stable).