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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.
Francis Y. Tsang, Robert M. Brugger
Nuclear Science and Engineering | Volume 74 | Number 1 | April 1980 | Pages 34-39
Technical Paper | doi.org/10.13182/NSE80-A18944
Articles are hosted by Taylor and Francis Online.
A filtered neutron beam technique has been used to measure changes in an average total neutron cross section of tin. The cross section was averaged over a neutron energy band from 23.1 to 24.9 keV, which covers a number of resonances. This average cross section, when measured for a sample of intermediate thickness, shows the effect of Doppler broadening of the resonances. The effective average total cross section increases as the temperature of the sample increases with a change of slope at the gray-to-white tin transition and a step at the melting point. The changes of slope and steps are evidence of changes in the thermal motions of the tin atoms in the sample when the sample changes its physical state.
