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Latest News
Securing the advanced reactor fleet
Physical protection accounts for a significant portion of a nuclear power plant’s operational costs. As the U.S. moves toward smaller and safer advanced reactors, similar protection strategies could prove cost prohibitive. For tomorrow’s small modular reactors and microreactors, security costs must remain appropriate to the size of the reactor for economical operation.
M. A. Lopez de Bertodano, A. Assad, Stephen Beus
Nuclear Science and Engineering | Volume 129 | Number 1 | May 1998 | Pages 72-80
Technical Paper | doi.org/10.13182/NSE98-A1964
Articles are hosted by Taylor and Francis Online.
Two-fluid model predictions of film dryout in annular flow are limited by the uncertainties in the constitutive relations for the entrainment rate of droplets from the liquid film. The main cause of these uncertainties is the lack of separate-effects experimental data in the range of the operating conditions in nuclear power reactors.Air/water and Freon-113 entrainment rate data have been obtained in 10-mm tubes using the film extraction technique. These experiments have been scaled to approach high-pressure steam/water flow conditions. The effects of surface tension and density ratio, missing from most previous data sets, have been systematically tested.The entrainment rate mechanism is assumed to be a Kelvin-Helmholtz instability. Based on this analysis and two previous correlations, a new correlation is proposed that is valid for low-viscosity fluids in small ducts in the ripple-annular regime.