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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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Powering the future: How the DOE is fueling nuclear fuel cycle research and development
As global interest in nuclear energy surges, the United States must remain at the forefront of research and development to ensure national energy security, advance nuclear technologies, and promote international cooperation on safety and nonproliferation. A crucial step in achieving this is analyzing how funding and resources are allocated to better understand how to direct future research and development. The Department of Energy has spearheaded this effort by funding hundreds of research projects across the country through the Nuclear Energy University Program (NEUP). This initiative has empowered dozens of universities to collaborate toward a nuclear-friendly future.
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).
