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New laws offer nuclear industry incentives for existing power plant uprates
This year, the U.S. nuclear industry received a much-needed economic boost that could help preserve operating nuclear power plants and incentivize upgrades that extend their lifespan and power output.
Signed into law in 2022, the Inflation Reduction Act offers production tax credits (PTCs) for existing nuclear power plants and either PTCs or investment tax credits (ITCs) for new carbon-free generation. These credits could make power uprates—increasing the maximum power level at which a commercial plant may operate—a much more appealing option for utilities.
Yoichi Watanabe, Jacob Appelbaum
Nuclear Science and Engineering | Volume 111 | Number 4 | August 1992 | Pages 379-390
Technical Paper | doi.org/10.13182/NSE92-A15485
Articles are hosted by Taylor and Francis Online.
Direct energy transfer by fission fragments near the wall of a cavity containing fissioning gas is studied in plane and cylindrical geometries. Analytical formulas are derived for the fission fragment energy flux. Heat transfer equations are solved for optically thick fissioning gases by taking into account the fission fragment energy transport effect. The results are applied to a heat transfer analysis of the fuel assemblies of a heterogeneous gas core reactor. The energy transfer mechanism in the fissioning gas is essentially nonlinear. Thus, the cooling effect due to direct fission fragment energy loss to the container walls does not become significant until the stopping range considerably exceeds the characteristic dimensions of the container. For example, when the ratio of the stopping range to the container dimension λ/δ is equal to 3, 45% of the energy flux at the container walls is due to the fission fragments; yet the maximum fuel temperature decreases by only l0%. If the ratio λ/δ is ∼100, fission fragments account for 95% of the energy flux to the walls, and the gas temperature decreases by 50%.