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Influence of Axial Power Distribution on Dryout: Film-Flow Models and Experiments
KTH, Skolan för teknikvetenskap (SCI), Fysik, Reaktorteknologi.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Reaktorteknologi.ORCID-id: 0000-0001-5595-1952
2010 (Engelska)Ingår i: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 240, nr 6, s. 1495-1505Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2010. Vol. 240, nr 6, s. 1495-1505
Nyckelord [en]
CRITICAL HEAT-FLUX; PREDICTION; CHANNELS; CODE; CHF
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
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, id: diva2:325356
Anmärkning
QC 20100618Tillgänglig från: 2010-06-18 Skapad: 2010-06-18 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
1. Dryout and Power Distribution Effects in Boiling Water Reactors
Öppna denna publikation i ny flik eller fönster >>Dryout and Power Distribution Effects in Boiling Water Reactors
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2009. s. x, 42
Serie
Trita-FYS, ISSN 0280-316X ; 2009:59
Nyckelord
Dryout, Film flow analysis, Power distribution, Measurements, Subchannel
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:kth:diva-11343 (URN)978-91-7415-481-8 (ISBN)
Disputation
2009-11-13, Sal FR4, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20100618Tillgänglig från: 2009-10-28 Skapad: 2009-10-28 Senast uppdaterad: 2010-07-19Bibliografiskt granskad

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