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Exelon files to deactivate the Byron reactors
Exelon on June 16 filed with grid operator PJM Interconnection to deactivate the two Byron reactors in Illinois. The move came one day after the Illinois Senate adjourned without reaching an agreement on a comprehensive energy package that would have provided nearly $700 million to keep Byron’s reactors, as well as Exelon’s Dresden and Braidwood nuclear power plants, in operation. (In August of 2020, Exelon announced that it would close the economically challenged Byron and Dresden facilities in the fall of 2021 without some form of state aid to provide compensation for their clean power.) The state’s House of Representatives also adjourned earlier this week without taking up the bill.
T. Höhne, D. Lucas
Nuclear Science and Engineering | Volume 194 | Number 10 | October 2020 | Pages 859-872
Technical Paper | dx.doi.org/10.1080/00295639.2020.1764265
Articles are hosted by Taylor and Francis Online.
This technical paper presents an application of the GEneralized TwO Phase flow (GENTOP) model for phase transfer and discusses the submodels used. Boiling of a heated surface under atmospheric conditions is simulated by the multifield computational fluid dynamics (CFD) approach. Subcooled water in a generic pool is heated up first in the near-wall region leading to the generation of small bubbles. Farther away from the bottom wall, larger bubbles are generated by coalescence and evaporation. The CFD simulation is based on the recently developed GENTOP concept. It is a multifield model using the Euler-Euler approach, and it allows the consideration of different local-flow morphologies, including transitions between them. Small steam bubbles are handled as dispersed phases, while the interface of large gas structures is statistically resolved. The multiscale simulation of the transitions from small bubble to larger structures during boiling in a pool is now feasible. However, the GENTOP submodels need a constant improvement and a separate, intensive validation effort using CFD-grade experiments.