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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.
Hans Jordan, Philip M. Schumacher, Vladimir Kogan
Nuclear Technology | Volume 72 | Number 2 | February 1986 | Pages 148-157
Technical Paper | Nuclear Safety | doi.org/10.13182/NT86-A33737
Articles are hosted by Taylor and Francis Online.
A two-component aerosol system is investigated using the MSPEC code, which models the dynamic behavior of particle composition as a function of particle size. The predicted aerosol concentration behavior is shown to be sensitive to several parameters and model choices, in contrast to the situation for singlecomponent aerosol systems, where these parameters and models appear to play a distinctly uncritical role. In addition, the predicted aerosol concentration behavior is shown to significantly diverge from that predicted by MSPEC using a “single-component” model mode that assumes uniform particle composition across the size distribution. This latter mode is common to codes presently used for nuclear accident source term evaluations. These findings point to the need for an expanded experimental data base, both to validate multiple-component aerosol behavior codes and to supply the necessary data to drive them.
