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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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DOE issues new NEPA rule and procedures—and accelerates DOME reactor testing
Meeting a deadline set in President Trump’s May 23 executive order “Reforming Nuclear Reactor Testing at the Department of Energy,” the DOE on June 30 updated information on its National Environmental Policy Act (NEPA) rulemaking and implementation procedures and published on its website an interim final rule that rescinds existing regulations alongside new implementing procedures.
Doo-Hyun Lim
Nuclear Technology | Volume 156 | Number 2 | November 2006 | Pages 222-245
Technical Paper | Radioactive Waste Management and Disposal | doi.org/10.13182/NT06-A3787
Articles are hosted by Taylor and Francis Online.
Migration of nuclides in a water-saturated high-level radioactive waste repository is analyzed by a newly developed two-dimensional numerical model incorporating a multiple-canister configuration and a nonuniform horizontal flow field of the host rock. The nonuniform flow field is established numerically by obtaining space-dependent groundwater flow velocity vectors using the finite element method. Transport of nuclides is simulated for the instantaneous-pulse-input source condition using the random-walk method. The current study for advection-dominant host rock shows quantitatively that the migration of nuclides in a repository adopting the disposal-pit vertical-emplacement concept is influenced not only by the canister configuration but also by flow boundary conditions, where groundwater flow is considered to be horizontal to the repository plane. The effects of applied hydraulic gradient direction h on nuclide migration become more significant as the number of canisters increases, while the effects are negligible for the single-canister configuration. As the number of canisters increases, the results of nuclide migration with respect to h range more widely and are bounded by two extreme cases. The h orthogonal to the orientation of the disposal tunnel is observed as most advantageous in terms of the isolation of the radionuclide. The single-canister configuration yields conservative results compared with the multiple-canister configuration.