Details

Autor(en) / Beteiligte

• Herranz, Luis E.
• Bentaib, Ahmed
• Gabrielli, Fabrizio
• Gupta, Sanjeev
• Kljenak, Ivo
• Paci, Sandro
• Piluso, Pascal

Titel

Overview of key thermal–hydraulic phenomena in severe accident unfolding: Current knowledge and further needs

Ist Teil von

• Nuclear engineering and design, 2023-06, Vol.407, p.112256, Article 112256

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• •Thermal–hydraulics plays an essential role in severe accident unfolding and most accident management actions.•Deep understanding of thermal–hydraulics is mandatory to reduce severe accident uncertainties and get an optimum management.•A list of thermal–hydraulic issues worth to be investigated from the severe accident perspective has been set.•Two key aspects of further investigation should be: representative experimental conditions and scaling.•Innovation into the research should come from new technologies (SMRs; ATFs) and new modeling approaches (BEPU; AI). Severe Accidents (SA) developments are closely and deeply linked with thermal-hydraulics, that is, fluid flow combined with heat and mass transfer. The present paper synthesizes this relation during an accident unfolding and provides an overview of the remaining gaps associated to thermal-hydraulics that need to be addressed to reduce the uncertainties associated to SA and to optimize their management. Some of those thermal–hydraulic phenomena are common to other areas, but most of them are genuine to the SA domain. In addition to thermal–hydraulic phenomena affecting SA development, there are others major SA consequences, like fission product transport and eventual release to the environment, that are heavily affected by thermal–hydraulic boundary conditions and need to be investigated under the anticipated accident conditions. There is a consensus that any investigation to be launched in the coming years should have a direct impact on either reducing the uncertainties associated to their modelling or on optimizing their management, or on both; such consensus was soundly built in the EC EURSAFE project and has been renewed under the frame of the SARNET projects and the SNETP/NUGENIA/TA2 activities.