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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Ho Nieh nominated to the NRC
Nieh
President Trump recently nominated Ho Nieh for the role of commissioner in the Nuclear Regulatory Commission through the remainder of a term that will expire June 30, 2029.
Nieh has been the vice president of regulatory affairs at Southern Nuclear since 2021, though he is currently working as a loaned executive at the Institute of Nuclear Power Operations, where he has been for more than a year.
Nieh’s experience: Nieh started his career at the Knolls Atomic Power Laboratory, where he worked primarily as a nuclear plant engineer and contributed as a civilian instructor in the U.S. Navy’s Nuclear Power Program.
From there, he joined the NRC in 1997 as a project engineer. In more than 19 years of service at the organization, he served in a variety of key leadership roles, including division director of Reactor Projects, division director of Inspection and Regional Support, and director of the Office of Nuclear Reactor Regulation.
Yu Jiang, Genshan Jiang, Xinlu Liu, Jianhao Sun
Nuclear Science and Engineering | Volume 199 | Number 9 | September 2025 | Pages 1458-1472
Research Article | doi.org/10.1080/00295639.2025.2462896
Articles are hosted by Taylor and Francis Online.
The leakage jet impact effect of steam generator heat exchanger piping causes the vibration response of adjacent piping and secondary sound radiation. This study establishes a three-dimensional numerical calculation model of a leakage jet impacting the pipe wall and studies in depth the action mechanism of the leakage jet on the adjacent pipe wall. It obtains the vibration characteristics of the pipe wall caused by the impact of the leakage jet. Calculations show that the leakage jet excites a complex flow field on the surface of the adjacent pipe wall, generating dynamic pressure loads and shear stresses. Dynamic pressure loads generate significant negative pressure wave signals on adjacent pipe walls, which in turn trigger pipe wall vibrations. With an increase in the leakage hole diameter and internal pressure, the dynamic load on the pipe wall increases significantly, leading to obvious changes in the vibration characteristics, revealing the influence law of the leakage jet on the dynamic response of the pipe wall.