Modified Evaporation Model for ATHLET System Code in a Passive Containment Cooling System for Nuclear Safety

[en] The presented work deals with the improvement of the evaporation model of the ATHLET (Analysis of Thermal and Hydraulics of Leaks and Transients) system code to be applied to a passive containment cooling system of a nuclear power plant. For the model validation, INTRAVIT (Investigation of Passive Heat Transfer in a Variably Inclined Tube) test facility setup at the University of Luxembourg was used. The first part of the paper presents a review of the existing literature on evaporation models that revealed that those models significantly simplify the physical processes that occur. Next, a modified evaporation model is proposed that offers a realistic description of various evaporation processes and the start of bubble formation using a nucleation model, and a surface density calculation model is introduced that is necessary for evaporation simulation. The final part of this work explored five different system configurations to test the evaporation model: three condenser tube inclinations (5 deg, 60 deg, and 90 deg), two riser lengths (1 m and 2.5 m), and different thermal loads. They made it possible to simulate several experiments for stable and unstable natural circulation and to verify the proposed model.

Disciplines :

Energy

Author, co-author :

HAAG, Michel ; University of Luxembourg > Faculty of Science, Technology and Medicine > Department of Engineering > Team Stephan LEYER

DOLGANOV, Iurii ; University of Luxembourg

LEYER, Stephan ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE)

External co-authors :

Language :

English

Title :

Modified Evaporation Model for ATHLET System Code in a Passive Containment Cooling System for Nuclear Safety

Publication date :

08 April 2024

Journal title :

Nuclear Technology

ISSN :

0029-5450

Publisher :

Taylor & Francis

Pages :

1-16

Peer reviewed :

Peer Reviewed verified by ORBi

Focus Area :

Physics and Materials Science

Development Goals :

9. Industry, innovation and infrastructure

Additional URL :

https://www.tandfonline.com/doi/pdf/10.1080/00295450.2024.2319933

Available on ORBilu :

since 09 April 2024

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