Dryout and Power Distribution Effects in Boiling Water Reactors
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Film flow measurements at several axial positions in round pipes with variousaxial power distributions are presented for conditions corresponding to normaloperation of a BWR. It is confirmed that the film flow rate approaches zero atthe onset of dryout. Selected phenomenological models of annular two-phaseflow are shown to reasonably reproduce the measurements. It is concluded thatmodels are in better agreement with measurements if terms corresponding topossible boiling induced entrainment are excluded.
A method to perform film flow analysis in subchannels as a post-processto a standard two-field subchannel code is suggested. It is shown that thisapproach may yield accurate prediction of dryout power in rod bundles to alow computational cost and that the influence of the power distribution is wellpredicted by the model.
Place, publisher, year, edition, pages
Stockholm: KTH , 2009. , x, 42 p.
Trita-FYS, ISSN 0280-316X ; 2009:59
Dryout, Film flow analysis, Power distribution, Measurements, Subchannel
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-11343ISBN: 978-91-7415-481-8OAI: oai:DiVA.org:kth-11343DiVA: diva2:274304
2009-11-13, Sal FR4, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Azzopardi, Barry, Professor
Anglart, Henryk, Docent
QC 201006182009-10-282009-10-282010-07-19Bibliographically approved
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