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Conference Spotlight
2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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Latest News
Senate EPW Committee to hold Nieh nomination hearing
Nieh
The Senate Environment and Public Works Committee will hold a nomination hearing Wednesday for Ho Nieh, President Donald Trump’s nominee to serve as commission at the Nuclear Regulatory Commission.
Trump nominated Nieh on July 30 to serve as NRC commissioner the remainder of a term that will expire June 30, 2029, as Nuclear NewsWire previously reported.
Nieh has been vice president of regulatory affairs at Southern Nuclear since 2021, though since June 2024 he has been at the Institute of Nuclear Power Operations as a loaned executive.
A return to the NRC: If confirmed by the Senate, Nieh would be returning to the NRC after three previous stints totaling nearly 20 years.
J. Jung, H. Y. Kim, S. M. An
Nuclear Technology | Volume 208 | Number 2 | February 2022 | Pages 268-283
Technical Paper | doi.org/10.1080/00295450.2021.1929769
Articles are hosted by Taylor and Francis Online.
For analysis of an ex-vessel severe accident, the corium melt conditions inside the reactor vessel are important at the time of the reactor vessel failure together with the reactor vessel failure mode. To determine penetration tube failure in the lower head of the reactor vessel during a severe accident, the Korea Atomic Energy Research Institute developed the PENetration Tube Analysis Program 2.0 (PENTAP 2.0) and carried out validation work based on experimental data that can simulate penetration tube heatup, rupture, penetration weld failure, and penetration tube ejection failure. A numerical simulation was undertaken to investigate the effect of the presence of melt in a tube, the expansion direction of the reactor vessel hole, and wall ablation on tube failure using PENTAP 2.0. The simulation results showed that the presence of melt inside the tube helps prevent tube ejection. When melt is not in the penetration tube, tube ejection is strongly dependent on the expansion direction of the reactor vessel hole.