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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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ANS joins others in seeking to discuss SNF/HLW impasse
The American Nuclear Society joined seven other organizations to send a letter to Energy Secretary Christopher Wright on July 8, asking to meet with him to discuss “the restoration of a highly functioning program to meet DOE’s legal responsibility to manage and dispose of the nation’s commercial and legacy defense spent nuclear fuel (SNF) and high-level radioactive waste (HLW).”
Robert C. Bowden, Casey Tompkins, Sun-Kyu Yang (CNL)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 751-764
In this experimental investigation, mean liquid velocity fields were investigated for turbulent flow within a horizontal 7-rod bundle geometry using Particle Image Velocimetry (PIV). PIV measurements were conducted at two axial locations, near the bundle inlet and also near the mid-plane, and at four Reynolds numbers ranging from approximately 8400 to 21000 based on a hydraulic diameter of 7.636 mm. The axial velocity fields in three different gap regions of the 7-rod bundle were reported, including rod-rod gaps and rod-channel gaps. Statistical techniques were used to describe the velocity fields, including mean and turbulent velocity components. The instantaneous and ensemble-averaged velocities in the gap regions are shown to be aligned in the axial (horizontal) flow direction, with a negligible mean vertical components. It was found that the maximum velocity profile was between 20 to 25% higher than the average velocity, while measured axial turbulent velocity typically ranged between 10 to 20% of the corresponding mean velocity. Profiles of local mean and turbulent velocity components in the gap regions were found to be self-similar when normalized using the maximum velocity, and local velocity, respectively.