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Influence of Axial Power Distribution on Dryout: Film-Flow Models and Experiments
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.ORCID iD: 0000-0001-5595-1952
2010 (English)In: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 240, no 6, 1495-1505 p.Article in journal (Refereed) Published
Abstract [en]

The influence of axial power distributions on dryout occurrence in nuclear fuel assemblies has been studied extensively for several decades. Even though it is well known that axial power shapes which may significantly vary in nuclear reactors during their operation significantly change the dryout power level, this particular influence is rather difficult to capture with current correlations. In this paper it is shown that this influence can be captured using a phenomenological liquid film model coupled to a standard sub-channel code. The model has been applied to various geometries, including a round pipe, as well as 5 x 5 and 8 x 8 fuel rod assemblies, and highly accurate predictions have been obtained.

Place, publisher, year, edition, pages
2010. Vol. 240, no 6, 1495-1505 p.
Keyword [en]
CRITICAL HEAT-FLUX; PREDICTION; CHANNELS; CODE; CHF
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-13447DOI: 10.1016/j.nucengdes.2010.02.013ISI: 000278442200022Scopus ID: 2-s2.0-77950926658OAI: oai:DiVA.org:kth-13447DiVA: diva2:325356
Note
QC 20100618Available from: 2010-06-18 Created: 2010-06-18 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Dryout and Power Distribution Effects in Boiling Water Reactors
Open this publication in new window or tab >>Dryout and Power Distribution Effects in Boiling Water Reactors
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

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.
Series
Trita-FYS, ISSN 0280-316X ; 2009:59
Keyword
Dryout, Film flow analysis, Power distribution, Measurements, Subchannel
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-11343 (URN)978-91-7415-481-8 (ISBN)
Public defence
2009-11-13, Sal FR4, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100618Available from: 2009-10-28 Created: 2009-10-28 Last updated: 2010-07-19Bibliographically approved

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Anglart, Henryk

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